吉林大学学报(工学版) ›› 2019, Vol. 49 ›› Issue (3): 850-858.doi: 10.13229/j.cnki.jdxbgxb20180142

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激光冲击强化对2Cr13不锈钢腐蚀 疲劳性能的影响

罗开玉1(),邢月华1,柴卿锋1,吴世凯2,尹叶芳1,鲁金忠1   

  1. 1. 江苏大学 机械工程学院，江苏 镇江 212013
    2. 北京工业大学 北京市激光应用技术工程技术研究中心，北京 100124
  • 收稿日期:2018-02-04 出版日期:2019-05-01 发布日期:2019-07-12
  • 作者简介:罗开玉(1975?), 女, 教授，博士生导师. 研究方向：激光加工技术. E?mail:kyluo@ujs.edu.cn
  • 基金资助:
    国家重点研发计划项目(2017YFB1103603);国家自然科学基金项目(51575242, 51471078);江苏省科技计划项目(BE2016148, BE2017142, BK20151341);北京市激光应用技术工程技术研究中心开放课题项目(BG0046?2018?04)

Effects of laser shock peening on corrosion fatigue behaviour of 2Cr13 stainless steel

Kai⁃yu LUO1(),Yue⁃hua XING1,Qing⁃feng CHAI1,Shi⁃kai WU2,Ye⁃fang YIN1,Jin⁃zhong LU1   

  1. 1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
    2. Beijing Engineering Researching Center of Laser Technology, Beijng University of Technology, Beijng 100124, China
  • Received:2018-02-04 Online:2019-05-01 Published:2019-07-12

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摘要：

通过残余应力测量、腐蚀疲劳试验和疲劳断口形貌观察，研究了不同激光冲击层数对2Cr13不锈钢腐蚀疲劳性能的影响。试验结果表明，LSP会在2Cr13不锈钢表面产生高幅残余压应力，且表面残余压应力值随LSP冲击层数的增加而增加。与未强化试样相比，LSP试样的腐蚀疲劳寿命提升，且随LSP冲击层数的增加而提高；LSP试样的腐蚀疲劳裂纹扩展速率降低，且随LSP冲击层数的增加而降低。经分析，未强化试样疲劳断口形貌比较平坦，二次裂纹较少；LSP试样由于表面产生了较高的残余压应力，有效抑制了腐蚀疲劳裂纹的扩展，最终断口表现出河流花样形貌。

关键词: 机械制造, 激光冲击强化, 2Cr13不锈钢, 腐蚀疲劳性能, 腐蚀疲劳裂纹扩展

Abstract:

Effects of Laser Shock Peening (LSP) with different coverage layers on Corrosion Fatigue (CF) resistance of 2Cr13 stainless steel were investigated by residual stress measuring, CF testing and fatigue fracture morphology observing. The results show that LSP can induce high compressive residual stress on the surface of 2Cr13 stainless steel, and the value of surface compressive residual stress increases with the LSP coverage layer. The CF life of LSP specimens is much larger than that of as?machined specimens, and it increases with the LSP coverage layers. The CF crack growth rate of LSP specimens decreases compared with that of as?machined specimens, and it decreases with the LSP coverage layers. After the analysis, we can conclude that the fatigue fracture surface of as?machined specimens is flat and contains few secondary cracks. However, for LSP specimens, due to high surface compressive residual stress induced by laser shock peening, the growth of CF crack is effectively restrained, resulting in a river pattern morphology.

Key words: mechnical manufacture, laser shock peening, 2Cr13 stainless steel, corrosion fatigue behaviour, corrosion fatigue crack growth

中图分类号: 

  • TH16

图1

试样尺寸，激光冲击强化区域放大图及残余应力测量路径"

图2

未强化试样，LSP?1和LSP?2试样沿中心线残余应力分布"

表1

不同层数激光冲击强化后残余应力值"

试样类型距缺口距离/mm
0369121518
强化前48-317-428-432-425-437-443
LSP?1-643-667-747-742-745-750-761
LSP?2-685-709-790-795-793-799-812

图3

未强化试样，LSP?1和LSP?2试样腐蚀疲劳裂纹扩展试验后沿裂纹扩展路径的残余应力分布"

表2

腐蚀疲劳试验后试样沿裂纹方向残余应力值"

试样类型距缺口距离/mm
0369121518
强化前36-14-26-27-20-12-31
LSP?1-271-19-35-12-21-28-17
LSP?2-318-31-28-42-23-19-22

表3

三种试样在3.5%和10%NaCl溶液中的腐蚀疲劳寿命"

试样类型环境介质

3.5% NaCl溶液

10% NaCl溶液
强化前5796152637
LSP?17583973100
LSP?28521180325

图4

未强化试样，LSP?1和LSP?2试样在3.5% NaCl溶液中da/dN?ΔK的双对数曲线"

图5

未强化试样，LSP?1和LSP?2试样在10% NaCl溶液中da/dN?ΔK的双对数曲线"

表4

不同激光冲击层数和腐蚀溶液浓度下材料常数"

试样类型，环境介质C'm
未强化试样, 3.5% NaCl-3.48612.15947
LSP?1试样, 3.5% NaCl-3.874422.81003
LSP?2试样, 3.5% NaCl-4.037632.97587
未强化试样, 10% NaCl-3.565312.81427
LSP?1试样, 10% NaCl-3.975642.8449
LSP?2试样, 10% NaCl-4.111413.07442

表5

不同激光冲击层数和腐蚀溶液浓度下拟合曲线方程"

试样类型环境介质
3.5% NaCl溶液10% NaCl溶液
未强化试样y1=2.15947x1-3.4861y1=2.81427x1-3.56531
LSP?1试样y2=2.81003x2-3.87442y2=2.8449x2-3.97564
LSP?2试样y3=2.97587x3-4.03763y3=3.07442x3-4.11141

图6

三点弯试样断口示意图"

图7

3.5%NaCl溶液中不同试样的断口形貌"

图8

3.5% NaCl溶液中不同试样腐蚀疲劳裂纹扩展区域的断口形貌"

图9

晶粒细化、残余压应力和溶液浓度对2Cr13不锈钢腐蚀疲劳性能的共同影响示意图"

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