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材料工程  2020, Vol. 48 Issue (5): 136-143    DOI: 10.11868/j.issn.1001-4381.2019.000080
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
拉-拉疲劳载荷下钛合金湿喷丸的残余应力松弛及再次喷丸工艺
赵慧生1, 陈国清1, 盖鹏涛2, 李志强2, 周文龙1, 付雪松1
1. 大连理工大学 材料科学与工程学院, 辽宁 大连 116085;
2. 中国航空制造技术研究院 塑性成形技术航空科技重点实验室, 北京 100024
Residual stress relaxation and re-shot-peening process of wet shot-peened titanium alloy during tensile fatigue load
ZHAO Hui-sheng1, CHEN Guo-qing1, GAI Peng-tao2, LI Zhi-qiang2, ZHOU Wen-long1, FU Xue-song1
1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, Liaoning, China;
2. Aeronautical Key Laboratory for Plastic Forming Technologies, AVIC Manufacturing Technology Institute, Beijing 100024, China
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摘要 采用湿法喷丸强化工艺(wet shot-peening)对TC4钛合金表面进行处理,研究高、低周的拉-拉疲劳过程中合金残余应力松弛规律,探讨再次喷丸工艺(re-shot-peening,RSP)对疲劳寿命的影响。结果表明:在拉应力载荷状态下,残余压应力依然发生松弛现象。疲劳载荷水平对喷丸TC4钛合金残余压应力场(CRSF)的松弛速率、松弛程度和松弛范围具有重要影响。高周疲劳(HCF)过程中残余应力松弛主要发生在近表层0~30 μm,松弛速率较慢。低周疲劳(LCF)过程中残余应力松弛发生在0~80 μm,范围更大,速率更快。RSP周期对于TC4钛合金的疲劳寿命也具有较大影响。在25%和50%初始喷丸疲劳寿命进行RSP处理会显著提高疲劳寿命,而在75%初始喷丸疲劳寿命处进行RSP处理对于疲劳寿命基本没有影响。此外,RSP的强化效果与疲劳载荷水平相关,对于高周疲劳寿命提高明显。
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赵慧生
陈国清
盖鹏涛
李志强
周文龙
付雪松
关键词 湿法喷丸残余应力松弛再次喷丸疲劳性能    
Abstract:The surface of TC4 titanium alloy was treated by wet shot-peening (SP). The residual stress relaxation during high and low cycle tensile fatigue was studied, and the effect of re-shot-peening (RSP) on fatigue life was discussed. The results show that relaxation of compressive residual stress still occurs under tensile stress. The fatigue load level has an important influence on the relaxation rate, degree and range of compressive residual stress field (CRSF) of shot peened TC4 titanium alloy. Residual stress relaxation during high cycle fatigue (HCF) mainly occurs in the near surface layer of 0-30 μm, and the relaxation rate is slow, while residual stress relaxation in low cycle fatigue (LCF) mainly occurs in the range of 0-80 μm, which is deeper and faster. RSP also has a great influence on the fatigue life of TC4 titanium alloy. It can significantly improve fatigue life at 25% and 50% of initial SP fatigue life, but has little effect on fatigue life at 75% of initial SP fatigue life. In addition, the strengthening effect of RSP is related to the level of fatigue load, which improves the HCF life obviously.
Key wordswet shot-peening    relaxation of residual stress    re-shot-peening    fatigue property
收稿日期: 2019-01-23      出版日期: 2020-05-28
中图分类号:  TG178  
通讯作者: 付雪松(1984-),男,副教授,博士,研究方向为塑性加工成形、环境损伤与防护,联系地址:辽宁省大连市甘井子区凌工路2号大连理工大学铸造工程中心(116023),E-mail:xsfu@dlut.edu.cn     E-mail: xsfu@dlut.edu.cn
引用本文:   
赵慧生, 陈国清, 盖鹏涛, 李志强, 周文龙, 付雪松. 拉-拉疲劳载荷下钛合金湿喷丸的残余应力松弛及再次喷丸工艺[J]. 材料工程, 2020, 48(5): 136-143.
ZHAO Hui-sheng, CHEN Guo-qing, GAI Peng-tao, LI Zhi-qiang, ZHOU Wen-long, FU Xue-song. Residual stress relaxation and re-shot-peening process of wet shot-peened titanium alloy during tensile fatigue load. Journal of Materials Engineering, 2020, 48(5): 136-143.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.000080      或      http://jme.biam.ac.cn/CN/Y2020/V48/I5/136
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