Effect of microstructure on small fatigue crack initiation and early propagation behavior in super martensite stainless steel

•Crack propagation slows during the transition from early to steady stages.•Cracks tend to propagate along-boundaries during the early propagation stage.•Multiscale martensite interfaces can cause varying degrees of crack deflection.•Martensite laths are the fundamental units influencing small crack...

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Bibliographic Details
Published in:International journal of fatigue 2025-01, Vol.190, p.108604, Article 108604
Main Authors: Li, Xue, Ye, Tian, Du, Yaohan, Zhan, Min, Wang, Xiangyu, Dai, Yajun, Liu, Yongjie, Wang, Chong, Yang, Kun, He, Chao, Wang, Qingyuan
Format: Article
Language:English
Subjects:
Fatigue crack initiation
Multi-scale microstructure
Small crack propagation
Super martensite stainless steel
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Summary:•Crack propagation slows during the transition from early to steady stages.•Cracks tend to propagate along-boundaries during the early propagation stage.•Multiscale martensite interfaces can cause varying degrees of crack deflection.•Martensite laths are the fundamental units influencing small crack propagation. The objective of this study is to investigate the influence mechanism of martensite multi-scale interfaces on the fatigue small cracks propagation behavior in super martensite stainless steel. The findings revealed that crack propagation slows during the transition from early to steady stages. Multiscale martensite interfaces can cause varying degrees of crack deflection, and cracks tend to propagate along-boundaries during the early propagation stage. Martensite lath is the basic unit that affects the fatigue performance and the behavior of small crack propagation.
ISSN:0142-1123
DOI:10.1016/j.ijfatigue.2024.108604