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中文摘要：
根据激光重熔的特点,考虑了材料热物性参数、换热系数、相变潜热随温度变化的因素,应用ANSYS的参数化设计语言建立了TC4钛合金表面激光重熔等离子喷涂NiCoCrAl-Y2O3涂层连续移动三维温度场有限元模型,并分析了激光功率和扫描速度对温度场的影响。结果表明：与激光功率相比,激光扫描速度对试样温度场的影响较小。实验结果较好地验证了模拟结果,表明所建立的温度场计算模型是正确和可靠的。通过该计算模型,可以掌握激光重熔过程加热和冷却规律,为制备高性能的MCrAlY涂层优化工艺参数提供依据。
英文摘要：
In view of the characters of laser remelting, a travel heat source combined with the surface loads was designed by analyzing both the temperature relativity of the thermal physical parameters of material and the latent heat and the effect of convection radiation on temperature field. A computing model of transient temperature field of three-dimension moving laser remelting NiCoCrAI-Y2O3 coating prepared by plasma spraying on titanium alloy was built up with the employment of ANSYS parametric design language. The effects of various process parameters on temperature field were also studied. The results show that, scanning rate has less influence on the temperature distribution of the workplece in comparslon with laser power. The obtained experimental results show a good agreement with the simulation results, which indicates that the established numerical model is correct and reliable. The model provides a guide for study on the formation and solidification mechanism of laser remelting and the results can be used to optimize the processing parameters.
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