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以黄铜为基材,钴基合金为熔覆粉末,采用预置粉末方式实现激光熔覆加工,对此过程建立三维有限元模型。考虑温度变化对热物性参数的影响以及表面对流换热和辐射散热等影响因素,使用SYSWELD软件对激光熔覆过程中的温度场和应力场进行了分析。结果表明,激光熔覆过程中的温度场变化是由非稳态到稳态的过程,熔覆层横截面上不同点热循环曲线呈锯齿状衰减;最大残余应力值出现在靠近基体的熔覆层中间位置;在其他工艺参数不变的情况下,扫描速度为8mm/s,熔覆过程的稀释率为11.5%,可以获得良好的冶金结合,并进行了试验验证;利用SYSWELD软件的校核功能,获得了扫描速度为6和10mm/s熔覆过程中较为合适的功率分别为2.96和3.82kW。
With brass as base material and cobalt-based alloy as cladding powder, the laser cladding process was carried out by preset powder method, and the three-dimensional finite element model was established. Considering the influence of temperature on the thermophysical parameters and the influencing factors such as surface convective heat transfer and radiative heat dissipation, the temperature and stress fields in the laser cladding process were analyzed by SYSWELD software. The results show that the temperature field changes from unsteady state to steady state during the laser cladding. The thermal cycling curves at different points in the cross section of the cladding layer decay in a jagged manner. The maximum residual stress appears near the cladding Layer middle position; the other process parameters remain unchanged, the scanning speed of 8mm / s, the cladding rate of 11.5% dilution, you can get a good metallurgical bond, and the experimental verification; the use of SYSWELD software check The functions, obtained at a scanning speed of 6 and 10mm / s cladding, the more suitable power were 2.96 and 3.82kW respectively.