TC4钛合金激光熔覆路径选择数值模拟研究  

Numerical Simulation of Laser Cladding Path Selection for TC4 Titanium Alloy

作　　者：梁广冰 朱锦洪[1] 尹丹青[1] 周杨凯 马宁[1] 张柯柯[1] Liang Guangbing;Zhu Jinhong;Yin Danqing;Zhou Yangkai;Ma Ning;Zhang Keke(Henan University of Science and Technology School of Materials Science&Engineering,Henan Luoyang 471023)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《河南科技大学学报（自然科学版）》2021年第6期12-18,M0003,共8页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家重点研发计划基金项目(2020YFB2008400);国家自然科学基金项目(U1904185)。

摘　　要：使用数值模拟技术,建立了不含预制裂纹的TC4钛合金三维激光熔覆有限元模型,并运用扩展有限元方法(XFEM)模拟裂纹扩展。对直线单向熔覆、直线往复熔覆和对称往复熔覆3种不同熔覆路径下,TC4钛合金激光熔覆温度场、应力场以及裂纹扩展过程进行了模拟。研究结果表明:采用对称往复的熔覆路径,熔覆过程温度场分布较为均匀,最大峰值温度为2755.02℃,该温度下熔覆涂层与基体能够形成良好的冶金结合,最大残余应力为884 MPa,显著小于其他两种熔覆路径的最大残余应力;裂纹产生最少,裂纹扩展距离最短。与试验结果较为符合。In this paper,numerical simulation technology was used to established TC4 titanium alloy 3D laser cladding thermodynamic coupling model excluding prefabricated crack on the basis of thermal elastic mechanics.The crack propagation was simulated by the extended finite element method(XFEM).The temperature field,stress field and crack propagation process of TC4 titanium alloy laser cladding were simulated under three different cladding paths of linear unidirectional cladding,linear reciprocating cladding and symmetrical reciprocating cladding.The results show that using symmetrical reciprocating cladding path,cladding process temperature field distribution is relatively uniform.The maximum peak temperature is 2755.02℃.The coating and substrate can form a good metallurgical bond at this temperature.The maximum residual stress is 884 MPa,which is significantly less than the residual stress of the other two cladding paths.It has the least crack generation and the shortest crack propagation distance,which is in good agreement with the experimental results.

关 键 词：激光熔覆 数值模拟 裂纹 熔覆路径 

分 类 号：TG442[金属学及工艺—焊接]