Hydrogen trapping behavior in vanadium-added steel

被引:149
作者
Asahi, H [1 ]
Hirakami, D [1 ]
Yamasaki, S [1 ]
机构
[1] Nippon Steel Corp Ltd, Steel Res Labs, Futtsu, Chiba 2938511, Japan
关键词
hydrogen embrittlement; hydrogen trapping; thermal desorption analysis; vanadium-added steel;
D O I
10.2355/isijinternational.43.527
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Hydrogen trapping and de-trapping behavior was investigated for steels with and without V. The de-trapping of hydrogen is very slow while the trapping presumably proceeds rapidly for steels containing VC precipitates. The activation energy for de-trapping is in the range of 33 to 35 kJ/mol, The trapped-hydrogen content and diffusible-hydrogen content in the steady state increase with increasing hydrogen entry rate into the steel. The density of hydrogen trapping sites decides the maximum trapped-hydrogen content; 9ppm for 1% V steel tempered at peak secondary hardening temperature, Analysis of hydrogen embrittlement cracking tests in terms of hydrogen contents such as the critical hydrogen content should be performed on the specimens with uniform hydrogen distribution and must consider the nature of hydrogen whether it is trapped or diffusible.
引用
收藏
页码:527 / 533
页数:7
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