scholarly journals The formation mechanism of refractory carbide phases in the complex-alloy heat-resistant steels during carburization.

2014 ◽  
Vol 2014 (2) ◽  
pp. 64-68
Author(s):  
Михаил Семенов ◽  
Mikhail Semenov
Keyword(s):  
Formation Mechanism ◽  
Numerical Experiments ◽  
Refractory Carbide ◽  
Complex Alloy ◽  
Carbide Phases ◽  
Heat Resistant ◽  
Diffusion Layers ◽  
Alloy Heat ◽  
Heat Resistant Steels

The laws of carbide phases nucleation were analyzed in the context of the complex-alloy heat-resistant steels carburization. Numerical experiments and metallographic investigations of steel and model alloys diffusion layers structures were applied to determine the predominant mechanism for the formation of refractory carbide phases.

Review of Reheat Crack in Welded Joint of Low Alloy Heat-Resistant Steels

2017 ◽  
Vol 730 ◽  
pp. 15-20
Author(s):  
Zhong Bing Chen ◽  
Yi Shi Lv ◽  
Wei Shi ◽  
Quan You Qi ◽  
Hai Bo Wang
Keyword(s):  
Welded Joint ◽  
Influence Factors ◽  
Postweld Heat Treatment ◽  
Parent Material ◽  
Mitigation Measures ◽  
Heat Resistant ◽  
Alloy Heat ◽  
Prevention Methods ◽  
Heat Resistant Steels ◽  
Crack Susceptibility

The current research status of reheat crack in welded joint of low alloy heat-resistant steels are outlined. Some new phenomena discovered in engineering in recent years are summarized, and related problems that remain to be studied are also presented. Reheat crack in welded joint is occurred frequently during postweld heat treatment (PWHT) or in service at elevated temperature. Mainly four mechanisms leading to reheat crack, respectively, impurity segregation grain boundary weakening, precipitation hardening, creep rupture and no-precipitation zone weakening have been generally accepted now. Several essential factors consist of parent material chemical composition, microstructure and thickness of welded joint, filler material, preheat and postheat procedures, welding energy input, PWHT parameter, and stress and strain and so on. Theoretical calculation methods, criterion of RoA (Reduction of Area) and several experimental methods are put forward to evaluate reheat crack susceptibility. Based on new issues emerged in engineering, problems of concerning reheat crack are necessary to be researched, which include at least mechanism and influence factors of new multi-element composite strengthening heat-resistant steels, the mitigation measures for increasing wall thickness weldment, the root cause analysis and prevention methods of conventional low alloy heat-resistant steels for long term service.

scholarly journals Z-phase Formation during Creep and Aging in 9–12% Cr Heat Resistant Steels

2006 ◽  
Vol 46 (5) ◽  
pp. 769-775 ◽  
Author(s):  
Kota Sawada ◽  
Hideaki Kushima ◽  
Kazuhiro Kimura
Keyword(s):  
Phase Formation ◽  
Heat Resistant ◽  
Heat Resistant Steels

Thermodynamic Interactions in Hot Isostatic Pressed Graded Structures of Dissimilar Heat Resistant Steels

1995 ◽  
Vol 86 (12) ◽  
pp. 864-869
Author(s):  
Rainer Prader ◽  
Bruno Buchmayr ◽  
Horst Cerjak ◽  
Alexander Fleming ◽  
Jürgen Peterseim
Keyword(s):  
Heat Resistant ◽  
Heat Resistant Steels ◽  
Graded Structures

scholarly journals Steam Oxidation of Ferritic Heat-resistant Steels for Ultra Supercritical Boilers

2001 ◽  
Vol 50 (2) ◽  
pp. 50-56 ◽  
Author(s):  
Yutaka Watanabe ◽  
Yongsun Yi ◽  
Tatsuo Kondo ◽  
Koshi Suzuki ◽  
Kimio Kano
Keyword(s):  
Steam Oxidation ◽  
Heat Resistant ◽  
Heat Resistant Steels

Damage Analysis of Heat Resistant Steels

2007 ◽  
Vol 537-538 ◽  
pp. 303-306
Author(s):  
Tamás Bíró ◽  
László Dévényi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Microscopy ◽  
Damage Analysis ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Advantages And Disadvantages ◽  
Heat Resistant ◽  
Heat Resistant Steels ◽  
Scanning Electron

This paper shows the result of some metallographical examinations that have been carried out on low-alloyed Cr-Mo-V heat resistant steel. The aim of this research is to present and compare the advantages and disadvantages of the mainly applied metallographical methods. These techniques are optical microscopy, scanning electron microscopy, replica method and special applications of these methods. We have proved that using the investigated methods together gives much more information about the lifetime of the specimen than using these techniques particularly.

Diagnostics of the serviceability of heat-resistant steels of the metallurgical equipment after thermal cycling

2011 ◽  
Vol 47 (2) ◽  
pp. 224-235
Author(s):  
P. V. Yasnii ◽  
P. O. Marushchak ◽  
A. P. Pylypenko ◽  
R. T. Bishchak ◽  
I. M. Zakiev ◽  
...  
Keyword(s):  
Thermal Cycling ◽  
Metallurgical Equipment ◽  
Heat Resistant ◽  
Heat Resistant Steels

Creep crack growth laws in heat-resistant steels

1991 ◽  
Vol 40 (6) ◽  
pp. 1147-1163 ◽  
Author(s):  
V.A. Vainshtok ◽  
M.V. Baumshtein ◽  
I.A. Makovetskaya ◽  
I.V. Kramarenko
Keyword(s):  
Crack Growth ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Heat Resistant ◽  
Growth Laws ◽  
Heat Resistant Steels

Effect of loading frequency, temperature, and cycle asymmetry on the endurance of heat-resistant steels 1Kh2m and Kh18N9. Part 1

1980 ◽  
Vol 12 (4) ◽  
pp. 439-444 ◽  
Author(s):  
V. A. Kuz'menko ◽  
I. I. Ishchenko ◽  
I. A. Troyan ◽  
S. V. Grishakov ◽  
L. E. Matokhnyuk ◽  
...  
Keyword(s):  
Loading Frequency ◽  
Cycle Asymmetry ◽  
Heat Resistant ◽  
Heat Resistant Steels ◽  
Frequency Temperature

scholarly journals Low and high cycle fatigue of heat resistant steels and nickel based alloys in hydrogen for gas, steam turbines and generators applications

2018 ◽  
Vol 165 ◽  
pp. 05002
Author(s):  
Alexander Balitskii ◽  
Jacek Eliasz ◽  
Valentina Balitska
Keyword(s):  
Hydrogen Pressure ◽  
Low Cycle Fatigue ◽  
Cyclic Crack Resistance ◽  
Rotor Steel ◽  
Cycle Fatigue ◽  
Steam Turbines ◽  
Heat Resistant ◽  
Short Term Strength ◽  
Strength And Plasticity ◽  
Heat Resistant Steels

It has been established that, at some region of hydrogen pressure and strain rate exists a maximum influence of hydrogen on the plasticity, low cycle fatigue and cyclic crack resistance of Ni-Co alloys and high nitrogen steels. The drop of plasticity of the dispersion-hardening materials within the temperature range of intense phase transformations is caused by the localization of strains on the grain boundaries due to the intense redistribution of alloying elements in the boundary regions. Moreover, the increase in plasticity observed at higher temperatures is caused both by partial coagulation of hardening phases and possible dissolution of small amounts of finely divided precipitations. The effect hydrogen on short-term strength and plasticity, high- and low-cycle durability of 15Cr12Ni2MoNMoWNb martensitic steel, 10Cr15Ni27Ti3W2BMo austenitic dispersion-hardened steel, heat resistant 3,5NiCrMoV rotor steel, 04Kh16Ni56Nb5Mo5TiAl and 05Kh19Ni55Nb2Mo9Al Ni-base superalloys in range of pressures 0–30 MPa and temperatures 293–1073 K was investigated. In the case of 15Cr12Ni2MoNMoWNb steel and 04Kh16Ni56Nb5Mo5TiAl alloy the dependence of low-cycle durability (N) and characteristics of plasticity (δ and φ) on the hydrogen pressure consists of two regions. In the first region (low pressures), the N, δ and φ abruptly drops, and in the second, the negative action of hydrogen becomes stable or decrease negligibility.

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