铝青铜表面激光熔覆镍基合金温度场的数值模拟

以铝青铜为基材、铜镍合金为熔覆粉末,采用压粉方式实现激光熔覆加工.对此过程建立二维温度场数值模型,考虑温度变化对铝青铜热物理参数的影响以及表面对流换热、内部结晶潜热等因素,用C++语言编写激光熔覆过程中温度场模型的计算程序.结果表明,激光熔覆加工过程中的温度场变化是由非稳态到达稳态的过程,激光光斑附近温度梯度较大,远离光斑处温度梯度较小.由温度场分布图得知,为优化加工质量,满足熔覆要求,试验应采用由高到低的功率进行熔覆.

Numerical simulation of temperature field of laser melt-cladding of Ni-based alloy on surface of aluminum-bronze

Taking the aluminum bronze as matrix material and copper-nickel alloys as cladding powder,the processing of laser melt-cladding was implemented with pressurized powder method.A two-dimensional numerical model of temperature was set up for this process,where the effects of temperature change on thermo-physical parameters of aluminum bronze,the surface convective heat transfer,and the internal latent heat of crystallization were taken into consideration.C++ language was used to prepare a program for evaluatin...