Effect of Laser Shock Peening on Fatigue Life of GH3039 Superalloy

Yang Tang; Maozhong Ge; Taiming Wang; Jianyun Xiang

doi:10.3788/LOP56.221401

Laser & Optoelectronics Progress, Volume. 56, Issue 22, 221401(2019)

Effect of Laser Shock Peening on Fatigue Life of GH3039 Superalloy

Yang Tang¹, Maozhong Ge^1、*, Taiming Wang², and Jianyun Xiang³

Author Affiliations

¹School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, Jiangsu 213001, China

²China Airlines Changzhou Lanxiang Machinery Co., Ltd., Changzhou, Jiangsu 213022, China

³School of Mechanical Engineering and Technology, Changzhou Institute of Industry Technology, Changzhou, Jiangsu 213164, China

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Figures & Tables(10)

Fig. 1. Shape and size of fatigue specimen

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Fig. 2. Fatigue sample after LSP and laser scanning direction

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Fig. 3. Cross-sectional microstructure of original sample of GH3039 superalloy

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Fig. 4. Microstructure of GH3039 superalloy after LSP. (a) Cross section; (b) local magnification in Fig. 4(a)

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Fig. 5. Residual stress state at tested point for different sample surfaces. (a) Original sample; (b) sample after LSP

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Fig. 6. Three-dimensional topographies of different sample surfaces. (a) Original sample; (b) sample after LSP

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$Morphologies of fatigue fractures of different samples$

Fig. 7. Morphologies of fatigue fractures of different samples

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Table 1. Chemical composition of GH3039 superalloy
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Table 1. Chemical composition of GH3039 superalloy
Element C Cr Al Ti Mo Nb Fe Si S Mn P Ni
Mass fraction /% ≤0.08 19-22 0.35-0.75 0.35-0.75 1.8-2.3 0.90-1.30 3.00 ≤0.80 ≤0.012 0.40 0.02 Bal.

Table 2. Surface residual stress of original sample and sample after LSP
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Table 2. Surface residual stress of original sample and sample after LSP
Tested point No. 1 2 3 4 5 6
Original sample 70.8 62.3 5.6 23.7 65.4 60.1
Laser peened sample -217.1 -202.4 -269.7 -255.3 -287.5 -298.4

Table 3. Fatigue cycles of GH3039 superalloy before and after LSP
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Table 3. Fatigue cycles of GH3039 superalloy before and after LSP
No. 1 2 3 4 5 6
Original sample 35354 34297 35067 33457 36118 34196
Laser peened sample 80541 86369 83142 84069 85023 83661

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Yang Tang, Maozhong Ge, Taiming Wang, Jianyun Xiang. Effect of Laser Shock Peening on Fatigue Life of GH3039 Superalloy[J]. Laser & Optoelectronics Progress, 2019, 56(22): 221401

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