M2高速钢表面激光熔覆WC-12Co梯度涂层的制备工艺与实验研究  

Preparation process and experimental study of laser cladding WC-12Co gradient coating on M2 high-speed steel surface

作　　者：郭海华 陈翔[2] 李金华[1] 姚芳萍[1] 王天赐 GUO Haihua;CHEN Xiang;LI Jinhua;YAO Fangping;WANG Tianci(School of Mechanical Engineering and Automation,Liaoning University of Technology,Jinzhou 121000,CHN;Engineering Practice Teaching Department,Liaoning University of Technology,Jinzhou 121000,CHN)

机构地区：[1]辽宁工业大学机械工程与自动化学院,辽宁锦州121000 [2]辽宁工业大学工程实践教学部,辽宁锦州121000

出　　处：《制造技术与机床》2024年第9期71-78,共8页Manufacturing Technology & Machine Tool

基　　金：辽宁省教育厅高等学校基本科研项目(LJKMZ20220967)。

摘　　要：文章采用COMSOL数值模拟软件,对M2高速钢表面熔覆WC-12Co涂层和添加Ni60过渡层熔覆WC-12Co梯度涂层进行数值模拟与分析。探究温度梯度随时间的变化规律,并结合梯度实验及涂层的宏观形貌与微观组织分析,总结梯度熔覆的热量耦合控制方法。模拟及实验结果表明:添加Ni60过渡层制备WC-12Co梯度涂层的温度梯度远远小于直接熔覆制备WC-12Co涂层的温度梯度;添加Ni60过渡层制备WC-12Co涂层可以利用直接熔覆制备WC-12Co涂层的激光功率,也可以扩大熔覆制备WC-12Co涂层的功率区间,有利于提高熔覆制备效率;添加Ni60过渡层能够改善涂层内部缺陷,细化组织晶粒;Ni60过渡层中的Ni元素扩散导致WC-12Co涂层的硬度降低,但仍高于基体的硬度性能。Using COMSOL numerical simulation software,numerical simulation and analysis were conducted on the surface cladding of WC-12Co coating and the WC-12Co gradient coating with added Ni60 transition layer on M2 high-speed steel.Investigate the changing rules of temperature gradient over time,and summarize the methods of heat coupling control in gradient cladding based on gradient experiments and analysis of the macroscopic morphology and microscopic structure of the coating.The simulation and experimental results show that the temperature gradient of the WC-12Co gradient coating prepared by adding the Ni60 transition layer is much smaller than that of the WC-12Co coating prepared by direct fusion deposition.Adding the Ni60 transition layer to prepare the WC-12Co coating can utilize the laser power of the direct fusion deposition process,as well as expand the power range of the fusion deposition process,which is beneficial for improving the efficiency of the fusion deposition process.Adding the Ni60 transition layer enhances the coating’s internal structure by reducing defects and refining the grain size.Although the diffusion of Ni elements within the Ni60 layer may slightly reduce the hardness of the WC-12Co coating,its hardness still exceeds that of the substrate.

关 键 词：M2高速钢 温度梯度 Ni60过渡层 WC-12Co熔覆涂层 激光功率 

分 类 号：TH142.2[一般工业技术—材料科学与工程] TG174.4[机械工程—机械制造及自动化]