Gu Jiayang, Luo Chunhui, Lu Zhubi, Ma Pingchuan, Xu Xinchao, Ren Xudong
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Ultrason Sonochem. 2021 Apr;72:105441. doi: 10.1016/j.ultsonch.2020.105441. Epub 2020 Dec 26.
The mechanism of laser cavitation peening (LCP) including laser shock wave, bubble collapse shock wave, and water-jet was investigated at various stand-off distances (γ) combined with experiment and simulation. The dynamic characteristics, pressure field, and temperature field of cavitation bubble were investigated. The Q235 steel was impacted by LCP and the strengthening mechanism was analyzed, and the chemical effect in LCP was discussed. The results found that the pressure intensity of shock wave and water-jet decreases with increasing the γ. At γ=0, the laser shock wave, bubble collapse shock wave, and water-jet are 989 Mpa, 763 Mpa, and 369 Mpa respectively. The pressure and temperature of the bubble decrease obviously in the second and third pulsations. The impact of LCP causes plastic deformation on the Q235 steel surface and refines the grains on the surface layer within a depth of 20-30 μm. The enhancement of microhardness and the residual stress increases with the increase of γ, and the optimal value for LCPwc is 0.4. The degradation rate of MB solution in the infinite domain, LCPwc, and LCP is 26.4%, 41.7%, and 34.5%.
结合实验与模拟，研究了不同离焦距离（γ）下激光空化喷丸（LCP）的机理，包括激光冲击波、气泡坍塌冲击波和水射流。研究了空化气泡的动态特性、压力场和温度场。对Q235钢进行了LCP冲击并分析了强化机理，讨论了LCP中的化学效应。结果发现，冲击波和水射流的压力强度随γ的增加而降低。在γ = 0时，激光冲击波、气泡坍塌冲击波和水射流分别为989兆帕、763兆帕和369兆帕。气泡的压力和温度在第二次和第三次脉动中明显降低。LCP冲击使Q235钢表面产生塑性变形，并使表层深度在20 - 30μm范围内的晶粒细化。显微硬度和残余应力的增强随γ的增加而增加，LCPwc的最佳值为0.4。在无限域、LCPwc和LCP中，亚甲基蓝（MB）溶液的降解率分别为26.4%、41.7%和34.5%。
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