Hydrogen-induced cracking behavior of twin boundary in γ′ phase strengthened Fe-Ni based austenitic alloys

被引：27
|
作者：
Chen, Shenghu [1 ]
Zhao, Mingjiu [1 ]
Rong, Lijian [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 561卷
基金：
中国国家自然科学基金;
关键词：
Hydrogen embrittlement; gamma ' phase; Grain boundaries; Twin boundaries; Stacking fault energy (SFE); STRAIN-RATE SENSITIVITY; STAINLESS-STEELS; MICROSTRUCTURE; EMBRITTLEMENT; DISLOCATIONS; MECHANISM; FRACTURE; GRAIN; CU;
D O I：
10.1016/j.msea.2012.10.069
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The hydrogen-induced cracking behavior is investigated in two Fe-Ni based austenitic alloys with different amounts of gamma' phase. It is observed that intergranular cracking existed in both alloys, while hydrogen-induced twin boundary cracking only occurred in the alloy with higher amount of gamma' phase. The occurrence of twin boundary cracking is primarily related to the stacking fault energy (SFE) of alloys, which decreases with the increasing amounts of gamma' phase: Enhanced slip planarity and increased difficulty in cutting through twin boundary are observed in the low-SFE alloy. Therefore, twin boundary cracking is induced by cooperative effects of SFE and hydrogen in Fe-Ni based austenitic alloys. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：7 / 12
页数：6
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