Critical hydrogen concentration for the brittle fracture of AISI 430 stainless steel

被引：26
|
作者：
Yen, SK [1 ]
Tsai, YC [1 ]
机构：
[1] NATL CHUNGHSING UNIV,DEPT MECH ENGN,TAICHUNG 40722,TAIWAN
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1996年 / 143卷 / 09期
关键词：
D O I：
10.1149/1.1837100
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The introduction of hydrogen to AISI 430 stainless steel by electrochemical charging was studied. Tensile tests were employed to elucidate the mechanical behavior of the alloy responding to the effect of aging after cathodic charging, dynamic charging, and interrupted charging. The fractography was investigated by scanning electron microscopy. It was found that the hydrogen embrittlement of AISI 430 stainless steel was mainly due to the trapping of hydrogen at dislocations, and its fracture type is mainly transgranular with a small fraction of intergranular fracture. Through mathematical modeling, with the diffusivity and surface concentration of hydrogen obtained by permeation measurements, the critical concentration of hydrogen required to change the fracture mode from ductile microvoid coalescence to brittle transgranular cracking was determined to he 1.45 x 10(-5) mol/cm(3).
引用
收藏
页码：2736 / 2741
页数：6
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