Effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron silicon alloy

被引：12
|
作者：
Takahashi, Yoshimasa [1 ]
Sakamoto, Junji [2 ]
Tanaka, Masaki [3 ]
Higashida, Kenji [3 ]
Noguchi, Hiroshi [2 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Nishi Ku, Fukuoka 8190395, Japan
[2] Kyushu Univ, Dept Mech Engn, Nishi Ku, Fukuoka 8190395, Japan
[3] Kyushu Univ, Dept Mat Sci & Engn, Nishi Ku, Fukuoka 8190395, Japan
来源：
SCRIPTA MATERIALIA | 2011年 / 64卷 / 08期
关键词：
Fatigue; Hydrogen; EBSD; TEM; Crack tip; SLIP CHARACTER; DEFORMATION; STRAIN; LOCALIZATION; NICKEL;
D O I：
10.1016/j.scriptamat.2010.12.032
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron silicon alloy was investigated by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. In contrast to the previously reported results in an inert environment, no dislocation cells were formed around the crack tip in a hydrogen environment. The microscopic features around the crack tip suggest that hydrogen promotes a mode I-type crack growth mechanism, which reasonably explains the observed macroscopic crack growth property. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：721 / 724
页数：4
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