喷丸处理对马氏体时效超高强度钢疲劳性能的影响

doi:10.13251/j.issn.0254-6051.2020.02.050

金属热处理 ›› 2020, Vol. 45 ›› Issue (2): 253-256.DOI: 10.13251/j.issn.0254-6051.2020.02.050

喷丸处理对马氏体时效超高强度钢疲劳性能的影响

康霞¹, 殷广强^1,2, 赵桂平¹

1. 西安交通大学航天航空学院机械结构强度与振动国家重点实验室, 陕西西安 710049;
2. 庆安集团有限公司航空设备研究所, 陕西西安 710077

收稿日期:2019-08-23 出版日期:2020-02-25 发布日期:2020-04-03
通讯作者: 赵桂平,女,博士生导师,E-mail:zhaogp@xjtu.edu.cn
作者简介:康霞(1993—),女,硕士研究生,从事机械结构强度及可靠性等方面研究,联系电话:18200288310,E-mail:kangxia1201@163.com。

Influence of shot peening on fatigue property of maraging ultra-high strength steel

Kang Xia¹, Yin Guangqiang^1,2, Zhao Guiping¹

1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an Shaanxi 710049, China;
2. Institute of Aviation Equipment, Qing'an Group Corporation Limited, Xi'an Shaanxi 710077, China

Received:2019-08-23 Online:2020-02-25 Published:2020-04-03

摘要/Abstract

摘要：

通过喷丸处理改善固溶+时效态某马氏体时效超高强度钢的疲劳性能。采用成组法和升降法对喷丸前后试样进行应力比R=-1的旋转弯曲疲劳试验,得到喷丸前后试样的疲劳寿命及1×10⁷周次下的疲劳极限,采用双加权最小二乘法拟合喷丸前后试样S-N曲线。采用X射线衍射法测定喷丸后试样残余应力,并结合ANSYS有限元数值分析,研究了喷丸残余应力对某超高强度钢疲劳性能的影响。结果表明:喷丸可显著提高某超高强度钢的疲劳寿命和疲劳极限,喷丸后的疲劳极限约为喷丸前的1.37倍;喷丸后产生的残余应力使疲劳源远离表面,且外载应力越小,疲劳源距离表面越远,寿命提高的效果越明显。

关键词: 喷丸, 马氏体时效超高强度钢, 疲劳性能

Abstract:

Fatigue property of a maraging ultra-high strength steel in solution treated and aged state was improved by shot peening. A rotating bending fatigue experiment of the specimens before and after shot peening was performed at stress ratio R=-1. Fatigue lives and fatigue limit at 1×10⁷ cycles were tested using the group method and staircase method, and the S-N curves were fitted with a double weighted least square method. Using X - ray diffraction to determine the residual stress of the shot peening samples, and combined with the results of finite element, the effect of residual stress on fatigue property of the ultra-high strength steel was studied. The results show that shot peening can significantly improve the fatigue life and fatigue limit of the ultra-high strength steel, and the fatigue limit after shot peening is 1.37 times higher than that of the unshot-peened specimens. The residual stress caused by shot peening makes the fatigue source far away from the surface, and the smaller the loading stress, the farther the distances of the fatigue source from the surface, and the effect of fatigue life improvement is more obvious.

Key words: shot peening, maraging ultra-high strength steel, fatigue property

中图分类号:

TG156.9

康霞, 殷广强, 赵桂平. 喷丸处理对马氏体时效超高强度钢疲劳性能的影响[J]. 金属热处理, 2020, 45(2): 253-256.

Kang Xia, Yin Guangqiang, Zhao Guiping. Influence of shot peening on fatigue property of maraging ultra-high strength steel[J]. HTM, 2020, 45(2): 253-256.

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喷丸处理对马氏体时效超高强度钢疲劳性能的影响

Influence of shot peening on fatigue property of maraging ultra-high strength steel

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