High-temperature failure mechanism and defect sensitivity of TC17 titanium alloy in high cycle fatigue
文献类型：期刊论文
| 作者 | Li, Gen2; Sun, Chengqi1,2 ; Sun CQ(孙成奇)
|
| 刊名 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2022-09-20 |
| 卷号 | 122页码:128-140 |
| ISSN号 | 1005-0302 |
| 关键词 | TC17 titanium alloy High temperature Defect High cycle fatigue Oxygen-rich layer Rough area |
| DOI | 10.1016/j.jmst.2022.01.010 |
| 通讯作者 | Sun, Chengqi(scq@lnm.imech.ac.cn) |
| 英文摘要 | Crack initiation is an essential stage of fatigue process due to its direct effect on fatigue failure. However, for titanium alloys in high-temperature high cycle fatigue (HCF), the crack initiation mechanisms remain unclear and the understanding for the defect sensitivity is also lacking. In this study, a series of fatigue tests and multi-scale microstructure characterizations were conducted to explore the high-temperature failure mechanism, and the coupled effect of temperature and defect on TC17 titanium alloy in HCF. It was found that an oxygen-rich layer (ORL) was produced at specimen surface at elevated temperatures, and brittle fracture of ORL at surface played a critical role for surface crack initiation in HCF. Besides, internal crack initiation with nanograins at high temperatures was a novel finding for the titanium alloy. Based on energy dispersive spectroscopy, electron backscatter diffraction and transmission electron microscope characterizations, the competition between surface and internal crack initiations at high temperatures was related to ORL at surface and dislocation resistance in inner microstructure. The fatigue strengths of smooth specimens decreased at elevated temperatures due to the lower dislocation resistance. While the fatigue strengths of the specimens with defect were not very sensitive to the temperatures. Finally, a fatigue strength model considering the coupled effect of temperature and defect was proposed for TC17 titanium alloy. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. |
| WOS关键词 | CRACK INITIATION ; ALUMINIDE ALLOY ; STRESS RATIO ; EARLY GROWTH ; BEHAVIOR ; TI-6AL-4V ; MICROSTRUCTURE ; TOLERANCE ; REGIMES |
| 资助项目 | National Natural Science Foundation of China[91860112] ; International Postdoctoral Exchange Fellowship Program (China) |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000788133900003 |
| 资助机构 | National Natural Science Foundation of China ; International Postdoctoral Exchange Fellowship Program (China) |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/88994]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Sun, Chengqi |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Gen,Sun, Chengqi,Sun CQ. High-temperature failure mechanism and defect sensitivity of TC17 titanium alloy in high cycle fatigue[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,122:128-140. |
| APA | Li, Gen,Sun, Chengqi,&孙成奇.(2022).High-temperature failure mechanism and defect sensitivity of TC17 titanium alloy in high cycle fatigue.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,122,128-140. |
| MLA | Li, Gen,et al."High-temperature failure mechanism and defect sensitivity of TC17 titanium alloy in high cycle fatigue".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 122(2022):128-140. |
入库方式： OAI收割
来源：力学研究所
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