激光冲击强化对TC17钛合金残余应力及显微组织的影响

Effect of Laser Shock Peening on Residual Stress and Microstructure of TC17 Titanium Alloy

采用不同的工艺参数对TC17钛合金进行了激光冲击强化(LSP)处理,对LSP后TC17钛合金的残余应力分布进行了测试,并用透射电子显微镜观察了显微组织。结果表明,LSP后TC17钛合金表面残余压应力随着冲击次数和冲击能量的增大而增大。LSP使TC17钛合金表面产生了剧烈的塑性变形和高密度位错,且随着激光冲击次数和能量的增大,位错密度也逐渐增大。

Laser shock peening （LSP） with different process parameters is applied on TC17 titanium alloy, the distribution of the residual stress of TC17 titanium alloy after LSP is tested, and the microstructure is observed by transmission electron microscopy. The results show that, the surface residual stress of TC17 titanium alloy after LSP increases with the increase of impact number and pulse energy. Severe plastic deformation and high density dislocation are found on TC17 titanium alloy surface after LSP. The density of dislocation increases with the increase of laser impact number and pulse energy.