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吴俊峰,邹世坤,巩水利,曹子文,车志刚,孙汝剑.连续激光冲击强化Al7050中厚板的过喷效应[J].稀有金属材料与工程(英文),2020,49(10):3395~3401.[Wu Junfeng,Zou Shikun,Gong Shuili,Cao Ziwen,Che Zhigang and Sun Rujian.An over peening effect of Al7050 mid-thick plates with continued multiple laser shock peening at the same positions[J].Rare Metal Materials and Engineering,2020,49(10):3395~3401.]
An over peening effect of Al7050 mid-thick plates with continued multiple laser shock peening at the same positions
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Received:September 30, 2019  Revised:December 20, 2019
DOI:
Key words: Al7050 mid-thick plates  Laser shock peening (LSP)  Over peening effect  Surface integrity  Internal spall
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Wu Junfeng,Zou Shikun,Gong Shuili,Cao Ziwen,Che Zhigang and Sun Rujian  
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Abstract:
      In this paper, an over peening effect was presented based on the researches of surface integrity and internal spall of Al7050 mid-thick plates with continued multiple laser shock peening (LSP) at the same positions. The dimensions of the samples were 50 mm × 50 mm × 5 mm (Length × Width × Thickness). Laser process parameters were laser energy of 30 J, square spots of 4 mm × 4 mm, pulse width of 15 ns and continued multiple LSP at the same positions (LSP-1~LSP-8). Surface morphology, surface residual stress, and micro-hardness in depth and cross-sectional microstructure were measured by Super depth 3D microscope system, X-ray diffraction instrument, Vickers indenter and Optical Microscope (OM), respectively. The results indicated that high micro-dent depressions of 197.8 μm and ridges of 130.8 μm were generated after continued LSP-5. Surface compressive residual stress changed into tensile residual stress from continued LSP-4 to continued LSP-5. After continued LSP-5, work soft with low micro-hardness was found in the bottom layer. Continued LSP-5 was the spall threshold of Al7050 mid-thick plates. The researched results can be beneficial to avoid the spall and improve the strengthening effect in an industry application of LSP.