激光冲击强化对2Cr13不锈钢腐蚀 疲劳性能的影响

doi:10.13229/j.cnki.jdxbgxb20180142

摘要/Abstract

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

罗开玉,邢月华,柴卿锋,吴世凯,尹叶芳,鲁金忠. 激光冲击强化对2Cr13不锈钢腐蚀疲劳性能的影响[J]. 吉林大学学报(工学版), 2019, 49(3): 850-858.

Kai⁃yu LUO,Yue⁃hua XING,Qing⁃feng CHAI,Shi⁃kai WU,Ye⁃fang YIN,Jin⁃zhong LU. Effects of laser shock peening on corrosion fatigue behaviour of 2Cr13 stainless steel[J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(3): 850-858.

图/表 14

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表1

图3

表2

表3

图4

图5

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	-3.4861	2.15947
LSP?1试样, 3.5% NaCl	-3.87442	2.81003
LSP?2试样, 3.5% NaCl	-4.03763	2.97587
未强化试样, 10% NaCl	-3.56531	2.81427
LSP?1试样, 10% NaCl	-3.97564	2.8449
LSP?2试样, 10% NaCl	-4.11141	3.07442

表4

表5

图6

图7

图8

图9

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试样类型	距缺口距离/mm
试样类型	0	3	6	9	12	15	18
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

试样类型	距缺口距离/mm
试样类型	0	3	6	9	12	15	18
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

试样类型	环境介质
试样类型	3.5% NaCl溶液	10% NaCl溶液
强化前	57961	52637
LSP?1	75839	73100
LSP?2	85211	80325

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

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