Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 850-858.doi: 10.13229/j.cnki.jdxbgxb20180142

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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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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

CLC Number: 

  • TH16

Fig. 1

Dimensions of specimen, measurement scheme of residual stress and partial enlargement drawing of LSPed region"

Fig. 2

Residual stresses distribution of as?machined, LSP?1, and LSP?2 specimens along center line"

Table 1

Residual stress values of specimens subjected to LSP with different coverage layers"

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

Fig. 3

Residual stresses distribution of as?machined, LSP?1, and LSP?2 specimens along crack growth direction after CFCG test"

Table 2

Residual stress values of specimens along crack growth direction after corrosion fatigue test"

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

Table 3

Corrosion fatigue life of three type specimen in 3.5% and 10% NaCl solutions"

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

Fig.4

Fitting curves of da/dN??K for as?machined, LSP?1 and LSP?2 specimens in3.5% NaCl solution"

Fig.5

Fitting curves of da/dN??K for as?machined, LSP?1 and LSP?2 specimens in 10% NaCl solution"

Table 4

Material constants C′ and m of specimens with different LSP coverage layers under different solution"

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

Table 5

Fitting equation of specimens with different LSP coverage layers under different solution"

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

Fig.6

Schematic diagram on fractural surface of three? point bending specimen"

Fig.7

Fractural morphology of all specimens after CFCG test in 3.5% NaCl solution"

Fig.8

Fractural morphology of all specimens in CFCG region in 3.5% NaCl solution"

Fig. 9

Schematic diagram of combined effects of grain refinement, compressive residual stress and solution concentration on corrosion fatigue crack growth of 2Cr13 steel"

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[1] Jin⁃zhong LU,Wan⁃ting ZHOU,Sheng⁃yang ZHANG,Yi⁃kai SHAO,Chang⁃yu WANG,Kai⁃yu LUO. Effect of coverage layer on corrosion resistance of 6061⁃T6 aluminum alloy subjected to laser shock peening [J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(3): 842-849.
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