【摘要】 利用SYSWELD有限元软件,采用预置粉末方式实现激光熔覆加工,考虑到材料热性能随温度变化、边界条件随温度变化及含有非线性单元等非线性因素,对普通碳钢表面激光熔覆镍基合金温度场的分布进行了模拟计算。结果表明,模拟计算值和实验实际测量值无论在宽度还是深度都符合,熔覆过程的稀释率为12.7%,可以获得良好的冶金结合,说明所建立的温度场计算模型是正确并可靠的,研究结果对工艺参数的优化和控制熔覆层稀释率提供了借鉴和指导作用。更多还原

【Abstract】 By taking common carbon steel as substrate material and Ni-based alloys as cladding powder,a threedimensional (3D) physical model of laser cladding with preset-powder method is established and the thermo-physical properties are established as the functions of temperature in consideration of boundary condition,non-linear units and so on.The temperature field of laser cladding process is analyzed by SYSWELD software.The results show that it is consistent with the simulation results shown in the experiment.The favorable metallurgy bonding with 12.7%dilution is obtained and the established numerical model is correct and reliable.These results provide reference and guidance for parametric optimization and control dilution rate of laser cladding.更多还原