钛合金表面激光熔覆碳化硼/钴基复合涂层的温度场模拟及试验研究  

Temperature Field Simulation and Experimental Research of Boron Carbide/Cobalt-based Composite Coating Fabricated by Laser Cladding on Titanium Alloy

作　　者：马俊峰[1] 王骏[1] 唐立平[1] 俞张勇 Ma Junfeng;Wang Jun;Tang Liping;Yu Zhangyong(Wuri lnstitute of Technology,School of Mechanical Technology,Wuxi,Jiangsu 214121,China)

机构地区：[1]无锡职业技术学院机械技术学院,江苏无锡214121

出　　处：《应用激光》2021年第4期732-737,共6页Applied Laser

基　　金：江苏省产学研合作资助项目(BY2020534)。

摘　　要：为改善钛合金(TC4)零部件硬度低、耐磨性差等缺陷,利用激光熔覆技术在TC4表面制备碳化硼/钴基合金(B4C/Cobalt-based)复合涂层。通过有限元法对复合涂层的温度场进行数值模拟,结合复合涂层的表面形貌和显微硬度分析,研究激光功率对单道激光熔覆B4C/Cobalt-based复合涂层的影响。结果表明:随着激光功率的升高,熔池峰值温度升高,热影响区增大,熔池深度增加,宽度几乎无变化;当激光功率为1600 W时,复合涂层的显微硬度达到最高值,为618.7 HV(2 N加载力),相较于TC4基底提升了79.2%,结合仿真和试验结果揭示了B4C的增强机理。In order to improve the defects of low hardness and poor wear resistance of titanium alloy(TC4) parts, B4C/Cobalt-based alloy composite coating was prepared on TC4 surface by laser cladding technology. The temperature field of the composite coating was numerically simulated by finite element method, and the influence of laser power on the single laser cladding of B4C/Cobalt-based composite coating was studied by the combination of surface morphologies and micro-hardness. The results show that the peak temperature and depth of molten pool increases with the increase of laser power, whereas the width of molten pool almost has no change. When the laser power is 1 600 W, the micro-hardness of the composite coating reaches the highest value of 618.7 HV(2 N loading force), which is 79.2% higher than that of TC4 substrate, and the strengthening mechanism of B4C is revealed.

关 键 词：激光熔覆 数值模拟 碳化硼/钴基合金 显微硬度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]