Effect of microstructure on small fatigue crack initiation and early propagation behavior in super austenitic stainless steel 654SMO

被引：20

作者：

Li, Xue ^{[1
]}

Liu, Chang ^{[2
,3
]}

Wang, Xiangyu ^{[2
,3
]}

Dai, Yajun ^{[2
,3
]}

Zhan, Min ^{[2
,3
]}

Liu, Yongjie ^{[2
,3
]}

Yang, Kun ^{[4
]}

He, Chao ^{[2
,3
]}

Wang, Qingyuan ^{[1
,2
,3
]}

机构：

[1] Chengdu Univ, Sch Architecture & Civil Engn, Chengdu 610106, Peoples R China

[2] Sichuan Univ, Failure Mech & Engn Disaster Prevent & Mitigat, Key Lab Sichuan Prov, Chengdu 610207, Peoples R China

[3] Sichuan Univ, Coll Architecture & Environm, MOE Key Lab Deep Earth Sci & Engn, Chengdu 610065, Peoples R China

[4] Chengdu Univ, Inst Adv Study, Chengdu 610106, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2024年 / 179卷

基金：

中国国家自然科学基金;

关键词：

Super austenitic stainless steel; Non-uniform microstructure; Fatigue crack initiation; Small crack propagation; HIGH-CYCLE FATIGUE; GROWTH; STRENGTH; DAMAGE; INCLUSION; STRESS; MECHANISMS; ALUMINUM; GRADIENT; ALLOY;

D O I：

10.1016/j.ijfatigue.2023.108022

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The objective of this study was to investigate the cyclic deformation mechanisms at the microstructural level and their correlation with the initiation and early propagation of small fatigue cracks in super austenitic stainless steel 654SMO. The findings revealed that localized microstructural variations in grain size and orientation led to strain concentration, which subsequently triggered crack initiation. The behavior of surrounding microstructural evolution influences the crack propagation mode, further affecting the crack propagation rate. The retarding effect of small grain cluster regions on grain growth is weaker compared to high-angle grain boundaries and pinning by small grains, and multiple slip will trigger cross slip, causing uneven local strain within the grains, thus altering the crack propagation path.

引用

页数：19

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