Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Chemical and Physical Analysis
Vacancy Clustering Behavior in Austenitic Stainless Steels and Nickel-chromium Alloys during Tensile Deformation after Hydrogen Charging
Kazuki SugitaMasataka MizunoHideki ArakiYasuharu ShiraiTomohiko OmuraKota TomatsuYuji Sakiyama
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2020 Volume 106 Issue 1 Pages 20-27

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Abstract

The effects of hydrogen charge on the defect formation behavior in austenitic stainless steels and nickel-chromium alloys during slow strain rate tensile tests (SSRT) were investigated by positron lifetime spectroscopy. Vacancy clustering was significantly promoted by hydrogen charge, although there was no remarkable difference in the dislocation density and mono-vacancy equivalent vacancy density between hydrogen-charged and uncharged samples under the same tensile strains. In various steels and nickel-chromium alloys, vacancy cluster sizes showed a good correlation with breaking elongations of hydrogen-charged samples, implying the vacancy clustering contributes to hydrogen embrittlement by affecting local plasticity.

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© 2020 The Iron and Steel Institute of Japan
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