Creep-fatigue voids and sub-grain boundaries assisted crack initiation for titanium alloy in VHCF regime with high mean stress at 400°C

被引：0

作者：

Liu, Fulin ^{[1
,2
]}

Chen, Yao ^{[1
,2
]}

He, Chao ^{[1
,2
]}

Liu, Yongjie ^{[1
,2
]}

Wang, Chong ^{[1
,2
]}

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

Li, Lang ^{[1
,2
]}

机构：

[1] MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu,610065, China

[2] Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province, Sichuan University, Chengdu,610207, China

[3] Institute of Advanced Study, Chengdu University, Chengdu,610106, China

来源：

Materials Science and Engineering: A | 2022年 / 844卷

基金：

中国国家自然科学基金;

关键词：

Creep - Energy dispersive spectroscopy - Grain boundaries - High-cycle fatigue - Low-cycle fatigue - Titanium alloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Very high cycle fatigue failure of bimodal titanium alloy at 400 °C and high mean stress has been investigated. Many circular creep-fatigue voids (CFVs) were found underneath the crack initiation zone, which were distributed in the β transformed matrix and near the grain boundaries (GBs) of primary α grains. By the energy dispersive spectroscopy (EDS) element mapping, the oxygen element was found to be enriched around the CFVs. In addition, many sub-GBs of small-angle GBs could be observed inside the primary α grains. Based on these, a new mechanism of CFVs and sub-GBs assisted crack initiation and early propagation in bimodal titanium alloys was proposed in very high cycle fatigue regime. © 2022 Elsevier B.V.

引用

共 4 条

[1] Creep-fatigue voids and sub-grain boundaries assisted crack initiation for titanium alloy in VHCF regime with high mean stress at 400°C
Liu, Fulin
Chen, Yao
He, Chao
Liu, Yongjie
Wang, Chong
Wang, Qingyuan
Li, Lang
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2022, 844
[2] Crack initiation mechanism of titanium alloy in very high cycle fatigue regime at 400°C considering stress ratio effect
Liu, Fulin
Peng, Haotian
Liu, Yongjie
Wang, Chong
Wang, Qingyuan
Chen, Yao
[J]. INTERNATIONAL JOURNAL OF FATIGUE, 2022, 163
[3] Crack initiation mechanism of titanium alloy in very high cycle fatigue regime at 400℃ considering stress ratio effect
Liu, Fulin
Peng, Haotian
Liu, Yongjie
Wang, Chong
Wang, Qingyuan
Chen, Yao
[J]. International Journal of Fatigue, 2022, 163
[4] Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime
He, Ruixiang
Peng, Haotian
Liu, Fulin
Khan, Muhammad Kashif
Chen, Yao
He, Chao
Wang, Chong
Wang, Qingyuan
Liu, Yongjie
[J]. MATERIALS, 2022, 15 (08)

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