期刊
MATERIALS RESEARCH LETTERS
卷 6, 期 1, 页码 61-66出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2017.1392370
关键词
Non-propagating fatigue crack; electron channeling contrast imaging; crack tip dislocation; high nitrogen steel; planar dislocation array
资金
- JSPS KAKENHI [JP16H06365]
- Grants-in-Aid for Scientific Research [16H06365] Funding Source: KAKEN
The dislocation pattern at the tip of a non-propagating fatigue crack in an Fe-25Cr-1N steel (mass%) was characterized by electron channeling contrast imaging. Planar dislocation arrays on two different slip planes were observed at the crack tip. Each planar dislocation array acts as a barrier to the motion of the other planar dislocations on different slip planes, contributing to the enhancement of the resistance to the crack propagation. IMPACT STATEMENT This paper employs 'electron-channeling-contrast-imaging (ECCI) in scanning electron microscope' technique to visualize fatigue crack tip dislocations in high nitrogen steel, and it showed highly planar dislocations interacting with pre-existing dislocations assisting non-propagating fatigue crack.
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