Ni(Al,X). Fe Ru. Ta Cu Cr Mo Hf W Nb Zr. V. Co Ti Si. (Ni,X)Al Co Ru. Fe. SiCu. Cr Zr Hf ... Co(Hf,X). Fe Ni Ru W. Cr Mo V. Cu Ta Zr. Nb Si Ti. (Co,X)Hf Ni Fe Ru ...

Sample electron-beam weldments were fabricated from 2-inch-thick 12Ni-5Cr-3Mo steel plates (at a 180 ksi yield strength) and also from 2-inch-thick 5 1/4Ni-Cr-Mo-V steel plates (at a 140 ksi yield strength) by using the lowvoltage (Sciaky) process and als...

A study was performed on the influence of various elements on the notch bend fracture toughness at 75F and -100F of .35%C, 3Ni-Cr-Mo-V martensitic steels tempered between 400 and 800F. The elements examined included C, Mn, Si, Cr, Ni, Mo, Co, V and Al. Th...

... Title : Stress Corrosion Cracking Behavior of Two Ni-Cr-Mo-V Steels in Caustic Solutions and Pure Oxygenated Water,. ...

... Title : Metallurgical Aspects in Welding Cr-Mo-V Turbine Rotor Steels. Part 1. Evaluation of Base Material and Heat Affected Zone. ...

The authors study the combined carbonylation of nitro and azo compounds taken separately in order to reveal the differences in their reactivity. Copper halides and oxides as well as chloride and bromide salts of Fe, Co, Ni, Cr, Mo, V, Ti, and Al, in contrast to their oxides, activate the carbonylation of azo ...

... Accession Number : AD0763207. Title : Erosion Study of 7.62mm CR-MO-V Steel Gun Tubes. Part 1. Erosion Analysis and Characterization. ...

... The materials investigated included four rotor forging steels (ASTM A471 Ni-Cr-Mo-V, ASTM A469 Ni-Mo-V, ASTM A470 Cr-Mo-V, and AISI 403 ...

... Accession Number : ADD142459. Title : Creep Crack Growth and Cavitation Damage in a 12% CrMoV Steel,. Descriptive Note : Journal Article,. ...

... Title : Comparison of Properties and Characteristics of Hot-Work Tool Steeels X38 CrMoV 5 1 (Thyrotherm 2343), X 40 CrMoV 5 1 (Thyrotherm 2344 ...

... Accession Number : AD0616925. Title : COMPOSITION REFINEMENT STUDY, 5NI-CR-MO-V STEEL. Descriptive Note : Technical rept.,. ...

... Title : The Stress Corrosion Susceptibility of a Quenched and Tempered 12 Pct CrMoV Martensitic Stainless Steel,. Corporate Author : ...

... Accession Number : AD0175309. Title : TOUGHNESS OF MARTENSITE AND BAINITE IN A 3 PERCENT NI-CR-MO-V STEEL. Corporate Author : ...

... Abstract : Fracture toughness results are measured in the transition region for an ASTM A471 Ni-Cr-Mo-V steel on two specimen sizes 1T compact ...

... FATT) of a specific Cr-Mo-V rotor was established that included the nondestructive information of the ECP minimum current density, grain size, ...

... Studies will invoive the conventional gun barrel material (Cr-Mo-V steel) and will encompass materials that are considered potentially superior. ...

... Title : Effects of Temperature and Frequency on the Fatigue Crack Growth Rate Properties of a 1950 Vintage CrMoV Rotor Material,. ...

... of various elements on the notch bend fracture toughness at 75F and -100F of .35%C, 3Ni-Cr-Mo-V martensitic steels tempered between 400 and ...

... ductility, embrittlement, fracture toughness, fracture transition, j ... AND ALLOYS FABRICATION METALLURGY HYDRAULIC AND PNEUMATIC ...

... utilized, or discussed these subjects: materials related terms: brittle fracture, carbon addition, chromium addition, copper addition, critical stress ...

... CR-Mo-V SIMULATED HEAT-AFFECTED ZONES,. ... IN TERMS OF ITS RESISTANCE TO REHEAT ... AND THE HOT-TENSILE PROPERTIES OF HAZ ...

The cyclic diametral strain and stress response of macroscopically untextured (nominally isotropic) bainitic Cr-Mo-V steels has been studied. The total axial strain amplitudes were controlled and chosen so that a range of ratios of plastic and elastic elo...

The cyclic diametral strain and stress response of macroscopically untextured (nominally isotropic) bainitc Cr-Mo-V steels has been studied. The total axial strain amplitudes were controlled and chosen so that a range of ratios of plastic and elastic elon...

The effect of strength on susceptibility to temper embrittlement in a quenched martensitic 3% Ni-Cr-Mo-V steel was examined by applying isothermal embrittling treatment and by varying tempering conditions. The fractured surfaces of Charpy impact specimens...

The plastic deformation behaviour of a precipitation hardened bainitic Cr-Mo-V steel is analyzed at ambient and low temperatures. The temperature dependent component of the yield strength is composed of the Peierls-Nabarro force and also partly of the str...

The effect of residual elements on the creep and stress rupture properties of Cr-Mo and Cr-Mo-V steels was investigated in two separate studies. In one study, the effect of controlled additions of Sb, P, Sn, and B on the properties of a normalized and tempered Cr-Mo steel at 1000$sup 0$F were evaluated. In a second study, two commerical Cr-Mo-V steels containing ...

24. Effect of frequency on corrosion fatigue crack propagation in ASTM. AS08/ A533 ...... NiCrMoV steel-0.3. N. Na2SO. 4 system increased with increasing temperature ...... frequency. [125159221]. 146 ...

The plastic deformation and cleavage fracture of a bainitic Cr-Mo-V steel have been studied. An estimate of the cleavage fracture strength has been made using several methods. The physical meaning of the microscopical cleavage fracture strength is not cle...

... Pagination or Media Count : 50. Abstract : Samples from the hot and cold ends of two retired CrMoV steam turbine rotors (Joppa No. 3 and Buck No. ...

... THE INCIDENCE OF REHEAT CRACKING IN 0.5CR MOV STEELS CURRENTLY USED AT ELEVATED TEMPERATURES IN UK STEAM POWER ...

... Accession Number : ADD132633. Title : Prediction of the Formation Region of Eutectic NbC in a Large 12Cr-Mo-V-Nb Steel Ingot,. ...

... 73 Representation of internal oxidation. ... C-300 Cr plated 300 600-round bursts at 4000 ... 300 per minute with 15-second cooling between each burst ...

... The study of materials to improve the service perfor- mance of military ... Cr-Mo-V steel is exten- sively used as a small arms gun barrel material, its ...

... softening was found throughout the tests but another phenomenon of over-softening occurred during the two-step tests when high strain cycles took ...

... in which hydrogen-induced cracking occurs, specifically a 1194 MPa yield strength NiCrMoV steel exposed to 345 kPa hydrogen sulfide gas. ...

In this study, kinetics of borides formed on the surface of 31CrMoV9 and 34CrAlNi7 steels borided in solid medium consisting of Ekabor II at 850-900-950 deg. C for 2, 4, 6 and 8 h were investigated. Scanning electron microscopy and optical microscopy examinations showed that borides formed on the surface of borided steels have columnar morphology. The borides formed in the ...

Liquid ion exchangers such as tri-n-octyl amine (TOA), tri-iso-octylamine (TIOA) and Aliquat 336 have been used in this laboratory for analytical separation of vanadium(V) and niobium(V), indium(III), thalium(III), thorium(IV), cerium(IV) from succinate solutions. Extension of this study has revealed that benzene solutions of TOA, TIOA and Aliquat 336 could be used for anion exchange extraction of ...

can be included in modeling the language (Wang, 2000; Erdogan et al., 2002). In this article, we accuracy may indeed be two very different businesses after all. References Erdogan H. Sarikaya R. Gao Y

In order to protect carbon steel of towers and piping of a GS experimental heavy water plant against corrosion produced by the action of aqueous solutions of hydrogen sulphide, a method, elsewhere published, was developed. Carbon steel exposed to saturate...

In order to protect carbon steel towers and piping of Girlder sulfide (G.S.) experimental heavy water plants against corrosion produced by the action of aqueous solutions of hydrogen sulfides, a method, previously published, was developed. Carbon steel, e...

The relationship between the degree of sensitization and the corrosion resistance of austenitic stainless steel has been reported since long time, however this relationship does not account for all the experimental results reported on the literature. The ...

In this work, metallic coatings of nickel was made over carbon steel using two different electrolytic solutions: The Watts's bath and the nickel sulfamate bath, using a pulse variable current. The method use was the traditional method, its means a thermos...

Phosphate coatings are inorganic crystalline deposits laid down uniformly on properly prepared surfaces by a chemical reaction with the treated base metal. The reaction consists in dissolving some surface metal by acid attack and then causing surface neut...

Samples from the hot and cold ends of two retired CrMoV steam turbine rotors (Joppa No. 3 and Buck No. 6) and of the failed Gallatin rotor were studied with respect to the degree of temper embrittlement, fracture mode, impurity segregation, and microstruc...

An experimental program was conducted to determine the plane strain fracture toughness (K sub IC) of the following classes of: (1) AISI Alloy Steels (4340, 4140); (2) 5Cr-Mo-V Steels; (3) Precipitation-Hardening Stainless Steels (17-7 PH, PH 15-7 Mo, 17-4...

The most important creep resisting cast steel grade in Europe is the GS-17 CrMoV511. The properties of weldments of this steel grade, especially the long term properties in former times did not reach the scatterband of base metal, due to the low C-content...

Low Cycle Fatigue (LCF) is considered. S-N tests conducted under strain control and axial loading at (R = 1) with the steam turbine rotor steel 26NiCrMoV145 and the blade steel X20Cr13 in boiler feed water of 90 C at pH7 are summarized. Details of the str...

The changes in structure of ultrahigh strength ausformed steel X 41 CrMoV 51 due to plasma welding were investigated. Plasma welds were compared with electron beam welds. It is shown that without post heat treatment, fracture occurs in the dendritic weld ...

Due to its excellent creep rupture properties and relative economy, silicon-deoxidized, tempered bainitic 1%CrMoV steel is currently used extensively for high-temperature steam turbine rotor forgings operating at temperatures up to 565{degree}C. However, there is considerable impetus to improve the toughness of this steel while maintaining its current level of creep rupture ...

A three-task effort was conducted to establish advanced fabrication procedures for 7.62mm gun barrels from materials more refractory in nature than the conventional Cr-Mo-V steels. Barrel configurations for the M134 and M219 weapon systems were selected f...

Corrosion studies were conducted to determine the electrochemical properties of weldments of two 5Ni-Cr-Mo-V steels and HY-80 submarine-hull steel in synthetic sea water. Laboratory tests showed that there was no significant difference in corrosion potent...

The mechanical properties of quenched and tempered Cr-Mo-V steel were determined at temperatures between 800F and 1300F at strain rates ranging from 0.002 to 20/min. Experimental data were analyzed as functions of strain rate and temperature on the basis ...

Measurements were made of the internal friction in technical iron alloyed with various quantities of Cr, Mo, V, and W. All alloys were annealed at 750 C fur two hours and tempered at 680 C. The temperature dependence of the internal friction curves are plotted, and microphotographs at various agings are included. ...

Studies were made to complete the laboratory phases of an HY-130 weldment development. Final laboratory composition studies showed that the standard 5Ni-Cr-Mo-V steel can meet the mechanical-property requirements for an HY-130 base metal in plates through...

24. 4.3 Task III . . . . . . . . . . . . . . . 34. 5.0 CONCLUSIONS . . . . . . . . . . . . . . . . . . . . 62 .... 146. 28. Weld Mismatch Details, Weldment PD- 4826. .... Navy sponsored contract for welding 5 Ni-Cr-Mo-V steel were used ...

The conventional martensitic 9-12% CrMoV Nb steel, type MANET/W.nr. 1.4914, an European reference, shows promising properties for an application as ''First Wall'' - and as structural material for fusion devices. One of few drawbacks is the high neutron-in...

In order to protect carbon steel towers and piping of a GS experimental heavy water plant against corrosion produced by the action of aqueous solutions of hydrogen sulphide, a method, elsewhere published, was developed. Carbon steel exposed to saturated a...

This paper is part of a series which corresponds to the carbon steel behaviour as construction material for Girlder sulfide (G.S.) heavy water plants. The present work analyses the iron concentration study during passivation in the passivating fluid. At t...

In heavy water plants that use the bithermal exchange H(sub 2)S-H(sub 2)O, a protective scale against corrosion is formed by the action of a solution of H(sub 2)S at high temperature for a tile between 10 to 14 days. Exposure to humid air during plant shu...

The passivation on carbon steels, in particular ASTM A 516 Degree 60 and ASTM A 333 steels is made, submitting it to the action of H(sub 2)S/H(sub 2)O(sup 1,2) corrosive medium. The steel is rapidly corroded by H(sub 2)S in aqueous solution, forming iron ...

In order to protect carbon steel towers and piping of Girlder sulfide (G.S.) experimental heavy water plants against corrosion produced by the action of aqueous solutions of hydrogen sulfide, a method, previously published, was developed. Carbon steel, ex...

An ASTM A 516 degree 60 carbon steel superficial protection technique submitted to a hydrogen-water sulfide corrosive medium at 2 MPa of pressure and 40-125 deg C forming on itself an iron sulfide layer was tested. Studies on pH influence, temperature, pa...

This work describes the assays aimed to passivate the steel carbon of the process pipings. This steel is marked by the ASTM A 333 G6 and is chemically similar to those of isotopic exchange towers which corrode in contact with in-water hydrogen sulfide sol...

would require low B-field (magnetic field damping after ... VHE �-rays. H.E.S.S. prelim. HESS VHE excess map. XMM map (2-4.5 keV) smoothed to HESS PSF preliminary ... B&W map: ATCA 1.4 GHz. Tian et al., ApJ 2008. Color map: H.E.S.S. �-ray excess ... Matching increase in absorption derived from 12CO observations ...

The purpose of this work is to evaluate the stress corrosion cracking (SCC) behaviour of two NiCrMoV alloys of Italian production, that are materials used for low pressure (LP) turbine discs in LWR nuclear plants. All the tests reported in this investigation have been performed using the slow strain rate technique (SSRT). A first set of experiments has been conducted in pure ...

The fatigue characteristics of the hot work tool steel X40CrMoV 51 (UNS number T20811) at high temperatures is presented. The temperatures for the experiments were chosen between 50-600 �C. The experiments used B-type cylindrical specimens machined from X40CrMoV in an R.R. Moore rotating bending type fatigue test machine obeying the high cycle principle. ...

The crack growth behavior of several high temperature nickel-base alloys, under cyclic and static loading, is studied and reviewed. In the oxide dispersion strengthened (ODS) MA 6000 and MA 754 alloys, the high temperature crack propagation exhibited orientation dependence under cyclic as well as under static loading. The creep crack growth (CCG) behavior of cast nickel-base IN-738 and IN-939* ...

Recently, Mackenbrock and Grabke published new results of Auger electron spectroscopy (AES) studies of the grain boundary segregation kinetics in a 12% CrMoV-steel doped with 0.057 wt% P. An interpretation of the phosphorus segregation behavior at intercrystalline fracture surfaces reveals an enrichment mechanism which is not bulk diffusion controlled as conventionally ...

Carbide coarsening has been investigated in a 12 percent CrMoV steel. Studies in the gauge length (creep exposed) and in the head (stress free ageing) for both interrupted and ruptured creep specimens tested at an initial stress of 80 MPa at various temperatures and at 600 C at different initial stresses have been performed. The measured quantities include hardness, carbide ...

Advanced ferritic/martensitic steels are being used extensively in fossil energy applications. New steels such as 2 1/4Cr-W-V (T23, T24), 3Cr-W-V, 9Cr-Mo-V (T91), 7Cr-W-V, 9Cr-W-V (T92 and T911), and 12Cr-W-V (T122, SAVE 12, and NF12) are examples of tubi...

Cr-Mo-V steels are used extensively as the rotor material in the High Pressure and Intermediate Pressure Sections of modern steam turbines. The toughness of these rotors has a major influence on the reliability and efficiency of the turbine and the overall economy of operation and maintenance of the plant. The metallurgical factors affecting the toughness of the rotors and the ...

Commercially available martensitic 12CrMo, 12CrMoV, and 12CrMoVNb steels in the tempered condition are often used to fabricate turbine blades. Tempering, done at the processing stage itself, is usually carried out at a temperature approximately 100 to 150 C above the service temperature. At the service temperature, the steel undergoes a second tempering. The effect of this ...

On the basis of the thermodynamics and kinetics of the processes of nitride formation, a model is devised which makes it possible to predict the distribution of hardness across the nitrided layer of steel, proceeding from the technological regimes. With the model it is possible, without the use of experimental or industrial equipment, to investigate and choose the most effective technological ...

The martensitic stainless steels, based on the nominal 12% Cr alloy composition, have been used at temperatures up to about 800 K, because of their non-oxidizing and superior high temperature mechanical properties. Literature established the microstructural evolution of 12% Cr steel during heat treatment and related it to the mechanisms of material degradation due to aging in high temperature ...

Autogeneous gas cutting and melting band sawing are two methods applied for parting high-strength steel. Both methods are described. Investigations were made for 45 CrMoV 6 7 steel with the following thicknesses: 13, 15 and 31 mm. Up to 15 mm sheet thickn...

In this project the influence of residual compression stresses on the stress corrosion cracking behaviour of the turbine disc steel 26 NiCrMoV 14 5 (Rp(sub 0.2) = 850 N/mm(sup 2)) was investigated. The residual compression stresses were produced by shot p...

Three high-temperature bainitic alloy steels were evaluated in the laboratory to determine the effects of Mn, Si, and impurities ( i.e., S, P, Sn, As, and Sb) on microstructure and mechanical properties. The alloy steels were 3.5NiCrMoV and CrMoV, which are used for turbine rotors, and 2.25Cr-1Mo, which is used in pressure vessel applications. The important effects of Mn, Si, ...

=0.0024 3.0Cr1.5Mo 0.1 0.2 1.0 0.1 1.5 3.0 0.1 3.5NiCrMoV 0.24 0.01 0.20 3.50 0.45 1.70 0.10 9Cr1Mo 0 #12;Designation C Si Mn Ni Mo Cr V 1Cr 1 2 Mo 0.15 0.25 0.50 � 0.6 0.95 1 4 CrMoV 0.15 0.25 0.50 0.05 0.50 0.30 0.11 0.19 3.0Cr1.5Mo 1.85 0.57 3.5NiCrMoV 0.09 1.61 2.85 9Cr1Mo 2.22 Mod. 9Cr1Mo 2.22 0.09 0.30 9Cr 1 2

As complement to the experiences on carbon steel passivation for its use in G.S. (Girlder sulfide) heavy water production plants, the results herein obtained are given, processing the material with a saturated solution at 2.3 MPa of full pressure and 125 ...

The procedures, including preheat and post-weld heat treatments, which were developed for welding Cr-MoV base metal with a 1/2% Cr-1% Mo electrode using both the manual metal-arc and submerged-arc processes are summarized. The rupture strength of the 1/2% Cr-1% Mo weld metal, as well as that of other low- alloy-steel weld metals, was evaluated and found to be less than ...

A method of analysing by M�ssbauer spectroscopy a steel ferromagnetic matrix has been developed. It provides the fractions of atomic elements in substitutional or interstitial sites in the Fe lattice, from the comparison between the experimental hyperfine-field distribution 0953-8984/9/23/017/img7 and the calculated one 0953-8984/9/23/017/img8. This method, applied to an M50 steel, in the simple ...

The low carbon, low alloy Cr-Mo-V steels with stabilized microstructures are widely used in electric power plants and petroleum industries because of their good serviceability of elevated temperatures. However, the phenomenon of temper embrittlement after thermal exposure at 623 to 873 K was stated. There are time-temperature relationships between the embrittlement of steels ...

This work presents the results of investigations using M�ssbauer spectroscopy technique and their interpretation concerning retained austenite (RA) and its transformation during tempering in relation to previously conducted dilatometric, microscopic and mechanical investigations. This research was conducted on a new high-carbon alloy steel 120 MnCrMoV8-6-4-2, which was ...

A methodology for obtaining a one-to-one correlation between Monte Carlo (MC) and real parameters of grain size and time is described. Using the methodology, and the MC grain growth algorithm, the grain structure in the weld heat-affected zone (HAZ) of a 0.5 Mo-Cr-V steel has been simulated. The simulations clearly show that the kinetics of grain growth can be retarded by the presence of steep ...

1Cr-Mo-V steel is widely used in power-generating plants for components which operate at high temperatures. Since many components used in power plants are subjected to complex loading cycles at high temperatures, high temperature low-cycle fatigue (LCF) experiments with hold time can be very meaningful tests for understanding the creep-fatigue interaction phenomenon under ...

In the course of development of 12 CrMoV steels nickel was added in order to improve impact properties and to suppress the presence of {delta}-ferrite in the microstructure. It was found, however, that excessive amounts of nickel, greater than {approximately}0.6 wt. %, caused an accelerated reduction in the creep rupture strength. This resulted in a downward inflexion in time ...

This paper aims to study the chip formation to obtain the optimal cutting conditions by observing the different chip formation mechanisms. Analysis of machining of a hardened alloy, X160CrMoV12-1 (cold work steel: AISI D2 with a ferritic and cementite matrix and coarse primary carbides), showed that there are relationships between the chip geometry, cutting conditions and the ...

This report describes numerous metallurgical tests applied to the major alloys used in light water reactor (LWR) piping, steam generators, and turbines to evaluate metallic corrosion and corrosion cracking in LWR systems. Extensive sets of accelerated tests of Type 304 SS (for BWR piping), Inconel 600 (for PWR steam generator tubing), ASTM 470, Ni-Cr-Mo-V (for turbine discs), ...

The variation of fracture toughness with temperature and specimen size of a 3 pct NiCrMoV LP disc steel has been investigated over the temperature range -100 to +100/sup 0/C using compact tension and single-edge-notched bend geometries. A number of large 'half-disc' three point bend specimens were also tested. Toughness increased up to a transition ...

Four different rotor materials, three CrMoV steels and a NiCrMoV steel, were investigated both with respect to solidification and HAZ liquation cracking. It involved the Varestraint testing using autogeneous gas tungsten arc welding at two different heat inputs, and metallographic examinations using optical, scanning and/or transmission electron microscopy. An increase in heat ...

A new generation nuclear reactor pressure vessel steel (CrMoV type) having compositional similarities with thick section 3Cr-Mo class of low alloy steels and adapted for nuclear applications was investigated for various manifestations of dynamic strain aging (DSA) using uniaxial tests. The steel investigated herein has undergone quenched and tempered treatment such that a ...

Knowledge of the material toughness is crucial in assessing the integrity of heavy section steel components. Conventional tests to determine the toughness involve extraction of large blocks of materials and therefore are not practical on in-service components. On the other hand, conservative assumptions regarding toughness without regard to actual data can lead to expensive and premature ...

Three advanced steel-melting processes - low-sulfur vacuum silicon deoxidation, electroslag remelting, and vacuum carbon deoxidation (VCD) - were applied to produce three CrMoV (ASTM A470, Class 8) steel forgings for steam turbine application. Ingots weighing about 100 t each were produced using these three processes, and rotors were forged with final weights of about 30 t ...

... been recorded in the diet1. Terrestrial A small police outpost was established on the island in 1969. ... 40 birds, but given its high levels of recruitment, this is probably not a serious threat, t...

In this research, the welding characteristics of a new UHSLA steel, 35NiCrMoV123, have been studied in two general conditions (annealed and quench-tempered). Carbon equivalent value of 35NiCrMoV123 steel is near 0.9 which classifies it as a �very difficult to weld� steel. The effects of welding heat treatment cycle (preheat, interpass, and postheat) on metallurgical and ...

Five non-precious Ni-Co based alloys were analyzed with respect to their corrosion behaviour. The correlation between the amount of the elements Cr, Mo, V and the corrosion behaviour, expressed by the PREN (pitting resistance equivalent number) index in the case of the allied steels, was extended for Ni-Cr and Co-Cr dental alloys ...

This work presents the results of investigations carried out using M�ssbauer spectroscopy technique, and their interpretation concerning ferrite or martensite matrix and its changes during tempering. The changes in the matrix are brought about by the stress relaxation, retained austenite transformation, nucleation and solubility of ? carbides as well as cementite nucleation and growth. This ...

Stress corrosion tests (SCC initiation and propagation) were carried out on a high purity version of the 3.5% NiCrMoV low pressure rotor steel in comparison to similar steels of conventional cleanness. In the constant load tests in 30% sodium hydroxide solution the clean steel showed longer times to crack initiation than the conventional steels with comparable strength levels. ...

The development of the tension leg platform (TLP) for the Hutton Field in the North Sea represents the first application of this deepwater concept. The use of vertical tension legs as the mooring system is the most novel part of the TLP design. One of the unique features of the tension legs is the use of 92.5-mm (3.64-in.) thick tubulars forged from 3 1/2 percent Ni-Cr-Mo-V ...

The development of the tension leg platform (TLP) for the Hutton Field in the North Sea represents the first application of this deepwater concept. The use of vertical tension legs as the mooring system is the most novel part of the TLP design. One of the unique features of the tension legs is the use of 92.5-mm (3.64-inch) thick tubulars forged from 3 1/2 percent Ni-Cr-Mo-V ...

The automated Steam Turbine Rotor Analysis Program (STRAP) has been developed to facilitate the prediction of rotor lifetime given the duty cycle of the turbine and the results of ultrasonic examination from the rotor bore. STRAP consists in part of a preprocessor that generates the boundary conditions and finite element mesh for transient and steady-state temperature and stress analysis. The ...

A compilation has been made of the chemical composition and mechanical properties of low-pressure turbine discs that had been retired from service. Several turbine disc forgings were also examined. Determination of the chemical composition included both bulk chemical analyses and trace element analyses. The mechanical properties measured included tensile strength, notch toughness, fracture ...

.1 1.5 3.0 0.1 3.5NiCrMoV 0.24 0.01 0.20 3.50 0.45 1.70 0.10 9Cr1Mo 0.10 0.60 0.40 � 1.00 9.00 � Mod. 9 of handling several simultaneous precipitation reactions has been devel- 3 #12;Designation C Si Mn Ni Mo Cr V 1Cr to the simultaneous transformations model [4]. C N Mn Cr Mo Ni V Nb 2 1 4 Cr1Mo 0.15 � 0.50 2.12 0.9 0.17 � � 3Cr1.5Mo

Scaling laws in dynamical magnetic minor hysteresis loops have been investigated in the magnetizing frequency range of 0.05-300 Hz for various steels including Cr-Mo-V steel subjected to creep, cold rolled steels, and plastically deformed Ni. Although scaling laws in the medium magnetization range found previously fail in the high magnetization frequency regime owing to a ...

The crystal structures, morphologies, and compositions of carbides in a martensitic pipe steel of type X20CrMoV12.1 after long-term service at 550 �C have been carefully investigated using transmission electron microscopy (TEM) and dispersive x-ray spectrometry (EDS). Most of carbides are M23C6. The M23C6 particles in prior austenite grains and in martensite lath boundaries ...

Recently, the authors reported the effects of hydrogen on the mixed mode 1/111 toughness of a high-purity Ni-Cr-Mo-V rotor steel. The steel was tested both in the uncharged and hydrogen-charged conditions. It was shown that the presence of hydrogen degraded the overall J toughness incrementally by approximately 30 pct, with the degree of degradation increasing with the mode ...

The high-temperature strength of low-alloy chrome steels with 9 and 12% Cr depends to a significant degree on the dispersion of the carbide phase in the ferritic structure of these steels. Hardening of lowalloy Cr-Mo-V steels occurs primarily as the result of vanadium carbides. Chrome steels additionally alloyed with molybdenum or molybdenum and vanadium are dispersion ...

Low-alloy Cr-Mo-V steels with carbon content up to 0.3 to 0.4% are used for steam turbine components. The effect of exposure to high temperatures under long-term aging or service causes carbide reactions, the kinetics and type of which depend on aging and alloying conditions and metallurgical history. In this research, carbide transformations were investigated in several ...

An investigation was made of the behavior of uraniumbearing steel containing Cr, Mo, V, Ti, Mn, and 0.25% C, as evidenced by; statistical examination of the effect of heat treatment and by plotting hardness-temperature curves. Metallographic examination revealed the presence of two additional phases believed to be UC and the ...

13 Oct 2010 ... En ambientes de muy baja gravedad, en cambio, no se necesita ning?n ... hechas de aleaci?n de titanio, vidrio met?lico, y acero inoxidable. ...

The publication presents the papers delivered in a workshop about trials and selection of the steels and their thermal treatments for stamping industry.

... including a direct microscopic examination and sodium nitrate flotation, completed during quarantine in May 2002 were negative ... negative for acid-fast staining organisms. Four fecal flotation examinati...

Initial Environmental Impact Assessment. 1991. J.M. Acero, J.L. Agraz, C.A. Aguirre and J. Plotz. Instituto Antartico Argentino and Alfred Wegener Institut ...

-- 116. Bhattachary, D. 1998. Enviromental values: a critical ap� praisal of cost�benefit analysis

Environmental impact assessment associated with the salvage operation of the ... Initial Environmental Impact Assessment. 1991. J.M. Acero, J.L. Agraz, C.A. ...

grant (FA9550-04-1-0117), an AFRL grant via Veridian and an NSF grant (IIS-0534707). We thank A. Acero

The purpose of the publication is to explain in an easy way the traditional process of steel manufacturing, and to promote the interest of the foundrymen working without large investment.

Many tropical fruits are rich in anthocyanins, though limited information is available about the characterization and quantification of these anthocyanins. The identification of anthocyanin pigments in four tropical fruits was determined by ion trap mass spectrometry. Fruits studied included acero...

A liquid bridge is a mass of liquid sustained by the action of the surface tension force between two parallel supporting disks Apart from their basic scientific interest a liquid bridge can be considered as the simplest idealization of the configuration appearing in the floating zone technique used for crystal growth and purification of high melting point materials footnote Messeguer et ...

Schwertmannite, an iron oxyhydroxide sulfate nanomineral, plays a significant role in the geochemistry of acid mine drainage (AMD) as a metastable phase with respect to goethite and by retaining toxic metals, e.g. arsenic [1]. Schwertmannite�s characteristic morphology is needles 100-300 nm long and only 5-10 nm in diameter extending from a dense aggregate. The poorly-and nano-crystalline nature ...

Life extension of high pressures and intermediate pressure rotors by weld repair is a viable alternative considering the latest developments. The objective is to select a filler wire that will produce a weld with mechanical properties compatible with those of the rotor material. Three filler metals, (CrMoV, 12% Cr and 5% Cr) were used in the investigation. Multipass submerged ...

Advanced ferritic/martensitic steels are being used extensively in fossil energy applications. New steels such as 2 1/4Cr-W-V (T23, T24), 3Cr-W-V, 9Cr-Mo-V (T91), 7Cr-W-V, 9Cr-W-V (T92 and T911), and 12Cr-W-V (T122, SAVE 12, and NF12) are examples of tubing being used in boilers and heat recovery steam generators (1). Other products for these new steels include piping, plates, ...

This article considers five different microstructures of a tempered martensitic 0.34C, 3Ni-1.3Cr-0.4Mo-0.1V steel through various heat treatments, including double austenitization (DA) treatments, and how the impact toughnesses are influenced by microstructure. Of the four mechanisms considered to explain the beneficial effect of DA treatment, the roles of retained austenite, grain-boundary ...

This report describes a research program conducted to determine susceptibility of steels used in low-pressure (LP) turbine rotors of power plants to stress corrosion cracking (SCC) in LP turbine environments. The program included slow-strain-rate and sustained-load SCC tests on samples from two 3.5 NiCrMoV rotor forgings. Environments included pure NaOH solutions, 3.5% NaCl, ...

Low-carbon, low-alloy Cr-Mo steels may fail by hydrogen attach when they are exposed to high hydrogen pressures at elevated temperature. During this process, the dissolved hydrogen reacts with the carbides of the steel to form methane in grain boundary cavities. The methane pressure inside these cavities depends on the microstructure of the used steel, which consists of a ferritic matrix and alloy ...

Rapidly solidified martensitic stainless steel (11.59Cr-0.98Mo-0.28V (in wt pct)) ribbons have been produced by the melt-spinning process. The microstructure of the ribbons showed three distinct zones: a columnar, a cellular, and a cellular-dendritic zone. The height of the columnar grain zone is independent of the process parameters such as the wheel material or the wheel velocity. Due to a high ...

Three advanced steel-melting processes - low-sulfur vacuum silicon deoxidation, electroslag remelting, and vacuum carbon deoxidation (VCD) - were applied to produce three CrMoV (ASTM A470, Class 8) steel forgings for steam turbine application. Ingots weighing about 100 t each were produced using these three processes, and rotors were forged with final weights of about 30 t ...

13 Oct 2010 ... El acero inoxidable es una aleaci?n (mezcla de hierro, n?quel y cromo), as? como lo es la mayor parte de la orfebrer?a (oro y n?quel). ...

The Atlas summarizes the experience of almost two decades of applied research in the siderurgical industry (IAS-CNEA joint agreements), by means of hot torsion test to evaluate the hot workability in steels through ductility properties and the formation s...

Within the framework of the development of low activation structural materials to be used in nuclear fusion reactors four martensitic Fe-9,5 Cr alloys were conceived with different contentsof tungsten-tantalum and/or germanium as substitutions for Mo, Ni,...

Ion nitriding is a glow discharge process that is used to induce surface modification in metals. It has been applied to 316-L austenitic stainless steel looking for similar benefits already obtained in other steels. An austenitic stainless steel was selec...

The main objective of the work was to determine the most common defects occuring in tool steels of the AISI D-2, S-1, 0-1 and W-2 series during thermal treatment. Defects were evaluated by metallographic analyses, a method used to determine and recognize ...

This is a theoretical-experimental laboratory study on the Electroslag Remelting Technology (ESRT) of high quality steels. The objective of this study was to analyze the problems that this technology entails and thus facilitate its industrial application ...

Maraging steel fabrication process metallurgy and cost effectiveness were investigated. Experimental melts were carried out in an induction furnace under argon atmosphere, and alternatively with vacuum remelting or direct induction melting under vacuum. A...

The experimental study focused on the behavior of six different steels, of approximately 0.35% C and various contents of Cr, Ni, and Mo. Each of these steels were tested in order to determine its fatigue limit to 10 million cycles, in 5 different states (...

Sensitization is a cause of corrosion that has been widely studied in austenitic steels; however, the relationship between sensitization and mechanical properties of steel is less known. Therefore, the objective of this work is to study the mechanical pro...

Telemetry Systems, Isanti, MN, USA; Holohil Systems, Carp, ON, Canada). All radios were attached ventrally-knobbed hornbill Aceros cassidix during the non-breeding season. � In: Poonswad, P. (ed.), The Asian hornbills

The intergranular stress cracking of welded joints of austenitic stainless steel, AISI 304, is a serious problem in BWR type reactors. It is associated with the simultaneous presence of three factors; stress, a critical media and sensibilization (DOS). EP...

Corrosion susceptibility under stress of AISI 304 steel sensitized in a sodium thiocyanate solution has been studied and results were compared with those obtained with solutions of thiosulfate and tetrathionate. Sensitized steel type 304 is highly suscept...

The relationship between: microstructure-heat treatment, microstructure-mechanical properties, microstructure-corrosion resistance make that the study of the microstructure of metals and alloys be a powerful tool either in technical-scientific research as...

With this work it is demonstrated the possibility of performing the nitriding process by using a CVD-ECR source, based on the results obtained after treating several samples of AISI H-12 steel. Also, the main operating parameters (time of treatment, sampl...

The peak stress and the steady state values for free cutting, carbon and alloyed steels deformed at high temperatures were obtained in this paper as a result of two regressions. With these data and the peak deformation values obtained in a former work, st...

'anodo de carb'on, reaccionando con 'el y produciendo di'oxido de carbono (ver [8]). En los ' ultimos a aislantes. Contiene un c'atodo formado por un bloque de carb'on atravesado por una barra de acero en cuyo

Analytical methods have been developed for the simultaneous determination of hydride-forming (As, Sb) and non-hydride-forming (Cr, Mo, V) elements in aqueous samples of a wide pH range (pH 3-13). The methods used dual-mode (DM) sample introduction with ICP-AES and ICP-MS instruments. The effect of selected experimental variables, i.e., ...

The Heavy-Section Steel Irradiation Program at Oak Ridge National Laboratory is involved in two cooperative projects, with international participants, both of which involve Charpy V-notch impact tests with instrumented strikers of 2mm and 8mm radii. Two heats of A 533 grade B class I pressure vessel steel and a low upper-shelf (LUS) submerged-arc (SA) weld were tested on the same Charpy machine, ...

de la meteorizaci�n de una balsa de residuos pir�ticos Patricia Acero Salazar #12;Estructura del proyecto Evoluci�n flujo y transporte reactivo en zona no saturada de balsas de residuos pir�ticos residuo (Tailings) Presa Capa agua anti-oxidaci�nEvaporaci�n O2 Tongadas sucesivas #12;O2 #12;Objetivos del

The susceptibility of a 17-4PH type steel to Stress Corrosion Cracking (SCC) in low pressure steam turbine environments was assessed using slow strain rate test at 90 Centigrade and at 1.35x10(sup -6) seg(sup -1). Environments tested included different co...

The most common and plesiomorphic mechanism of food transport in tetrapods is lingual-based. Neognathous birds use this mechanism for exploiting a large diversity of food resources, whereas paleognathous birds use cranioinertial mechanism with or without tongue involvement. Food transport in three hornbills' species (Aceros cassidix, A. undulatus, and Buceros hydrocorax) is ...

Economic and environmental concerns demand that the power-generation industry seek increased efficiency for gas turbines. Higher efficiency requires higher operating temperatures, with the objective temperature for the hottest sections of new systems {approx} 593 C, and increasing to {approx} 650 C. Because of their good thermal properties, Cr-Mo-V cast ferritic steels are ...

... keywords:, data, dr mmc, mmc, mmc data, (al2o3)p/al, (al2o3)p/al-mg, al alloys, al-mg matrix, al2o3 particulates, al2o3/al, al2o3/al-mg, ...