中高温条件下激光冲击处理Ti-6Al-4V表面完整性变化
Change of surface integrity of Ti-6Al-4V titanium alloy by laser shock processing at middle and high temperatures
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摘要: 为了研究中高温条件下激光冲击处理对Ti-6Al-4V钛合金的表面完整性的影响,采用高功率、短脉冲Nd:YAG激光器对Ti-6Al-4V钛合金表面进行激光冲击,并将冲击后的钛合金试样分别置于400℃,500℃,550℃和600℃的温度下进行保温处理。从表面形貌、表面粗糙度、表面残余应力等方面分析了中高温条件下激光冲击处理对Ti-6Al-4V钛合金的表面完整性的影响。结果表明,激光冲击处理增大了Ti-6Al-4V钛合金的表面粗糙度,且热处理温度越高,Ti-6Al-4V钛合金的表面粗糙度越大;激光冲击处理显著提高了Ti-6Al-4V钛合金材料的表面残余压应力,随着温度的升高,残余压应力值降低。研究结果对了解和掌握Ti-6Al-4V钛合金的使用性能是有帮助的。Abstract: In order to study effect of laser shock processing (LSP) on surface integrity of Ti-6Al-4V titanium alloy at middle and high temperatures, a high power short pulse Nd:YAG laser was used to shock the surface of Ti-6Al-4V titanium alloy. And then, the specimens after LSP were held at 400℃, 500℃, 550℃ and 600℃ respectively for one hour. The influence of LSP on surface integrity of Ti-6Al-4V titanium alloy at middle and high temperatures were analyzed from surface morphology, surface roughness and surface residual stress. The results indicate that LSP increases the surface roughness of Ti-6Al-4V titanium alloy. The surface roughness increases with the increase of heat treatment temperature. The surface residual stress of Ti-6Al-4V titanium alloy increases obviously after LSP. The higher the temperature, the smaller the surface residual stress is. The research results are helpful for understanding the performance of Ti-6Al-4V titanium alloy.
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