摘要
介绍了用激光冲击处理航空材料钛合金TC4提高其力学性能的技术.当利用强激光冲击钛合金表面时,涂层表面形成高幅值冲击波.在冲击波的高压作用下,钛合金表面发生微塑性变形,形成高幅值残余压应力层.激光冲击后,表面压应力层厚度达1 mm以上,压应力达200 MPa以上.随着激光能量的增加,冲击区域的残余应力有增大的趋势,在功率密度由1 GW/cm2增加到5 GW/cm2过程中,其冲击波峰值处的压力线性增加,表面最大残余压应力也相应线性增加;在功率密度为2 GW/cm2时,残余压应力随着次数增加而升高,而且表面硬度也大大提高,从而有效地改善了材料的机械性能,大幅度提高航空材料的疲劳寿命和抗应力腐蚀性能.
Residual stress of the TC4 alloy both before and after laser processing with multishocks was analyzed.The depth of compressive residual stress was found to have a dependence on the number of shocking layers and a slight dependence on the level of irradiance.The material remains in compressive residual stress of approximately 1mm in depth,and the compressive residual stresses at the surface of the sample is about 200 MPa.Near the surface,yield strength and hardness were found to be increased by the laser sho...
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第S1期150-152,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家高技术研究发展计划资助项目(2002AA336030)
国防航空基金资助项目(02H52053)
关键词
激光冲击
钛合金
机械性能
laser shock
titanium alloy
mechanical properties
