Effect of microstructure and local stress on small crack initiation and propagation paths in coarse‐grained FeCrAl alloys

Author:

Zhan Min12,Liu Chang1,Dai Yajun1,Wang Xiangyu1,Chen Yao1,Liu Yongjie12,Wang Chong1ORCID,Li Lang2,Wang Qingyuan23ORCID,He Chao12ORCID

Affiliation:

1. Key Laboratory of Deep Earth Science and Engineering, Ministry of Education, College of Architecture and Environment Sichuan University Chengdu China

2. Failure Mechanics and Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province Sichuan University Chengdu China

3. School of Architecture and Civil Engineering Chengdu University Chengdu China

Abstract

AbstractThis study investigated the high cycle fatigue crack initiation and propagation behaviors in coarse‐grained FeCrAl alloys, with a focus on the relationship between the path of small cracks and the local microstructure. The results show that the small cracks initiate along the {100} slip plane due to the synthetical influence of local microstructure and shear stress. The initiation zone forms inclined areas with layered fine‐grain areas caused by cyclic shear stress. Quantitative analysis of the stress intensity factor (SIF) indicates that in the realm of mixed‐mode loading, the SIF of Mode I takes the lead in determining the intensity of stress and strain fields at the crack tip. As the crack propagates further, the SIF steadily increases. Once it reaches a specific threshold, the propagation mode within a coarse grain shifts from Mode II to Mode I. Moreover, fatigue life increases with a tendency for decreased SIF during crack deflection.

Funder

National Natural Science Foundation of China

Sichuan Province Science and Technology Support Program

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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