TC4钛合金叶片型面喷丸数值模拟与轨迹优化试验  

Numerical simulation and trajectory optimization test of TC4 titanium alloy blade surface shot peening

作　　者：孙海波[1] Sun Haibo(Changchun Polytechnic,Changchun 130000,China)

机构地区：[1]长春职业技术学院,吉林长春130000

出　　处：《轻金属》2022年第8期45-50,共6页Light Metals

基　　金：吉林省科技发展计划项目(20190302099GX)。

摘　　要：针对TC4钛合金压气机叶片型面喷丸过程易产生形变问题,对其喷丸轨迹展开研究。利用多弹丸的喷丸模拟结果,建立喷丸残余应力场和应变场同喷丸参数的对应关系,从而基于温度场的喷丸模拟对叶片型面进行喷丸模拟以解决海量弹丸击打模拟耗时的问题。同时,将通过多弹丸获取的等效应变场引入模型中,对型面喷丸过程进行数值模拟,并在先喷背弧再喷内弧的喷丸顺序下设计了3种S型喷丸轨迹进行试验测试。研究结果表明:TC4钛合金叶片在喷丸强化后都会呈现出由内弧向背弧的变形趋势,且不同喷丸轨迹产生的变形结果各不一致,其中轨迹Ⅲ的变形量最小,约为0.19 mm,轨迹Ⅰ变形量最大,约为0.24 mm。可见,喷丸轨迹是影响叶片型面形变的重要因素,通过轨迹优化能够有效减小叶片变形幅度,提高钛合金叶片的疲劳强度,达到喷丸强化的最佳效果,为钛合金叶片喷丸工艺优化提供新思想。With respect to the deformation of TC4 titanium alloy compressor blade surface during shot peening,the shot peening trajectory is studied.The corresponding relationship between shot peening residual stress field,strain field and shot peening parameters is established by using the shot peening simulation results of multiple shots,so as to simulate the blade surface based on the shot peening simulation of temperature field,and solve the time-consuming problem of massive shot impact simulation.Meanwhile,the equivalent effect variable field obtained by multiple shots is introduced into the model to simulate the surface shot peening process,and three S-type shot peening trajectories are designed for experimental test under the shot peening sequence of spraying back arc first and then inner arc.The research results show that TC4 titanium alloy blade will exhibit a deformation trend from inner arc to back arc after shot peening strengthening,and the deformation results produced by different shot peening trajectories are inconsistent.The deformation of trajectory III is the smallest,about 0.19 mm,and the deformation of trajectory I is the largest,about 0.24 mm.It can be seen that the shot peening trajectory is an important factor affecting the blade surface deformation.Through the trajectory optimization,the blade deformation amplitude can be effectively reduced,the fatigue strength of titanium alloy blade can be improved,the best effect of shot peening can be achieved,and a new idea can be provided for the shot peening process optimization of titanium alloy blade.

关 键 词：喷丸强化 轨迹优化 钛合金叶片 数值模拟 

分 类 号：V260.5[航空宇航科学与技术—航空宇航制造工程] TG146.23[一般工业技术—材料科学与工程]