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根据传热学理论和数值模拟方法研究温度场的分布规律,在考虑了热物性参数、换热系数、相变潜热随温度变化的因素,应用ANSYS有限元软件的参数化设计语言建立了45钢表面激光重熔连续移动三维瞬态温度场有限元模型。结果表明:提高激光功率对增大相变硬化区效果不大,反而形成较大的熔池而使重熔表面粗糙。与激光功率相比,激光扫描速度对试样温度场的影响较小。经过激光重熔后,形成重熔区、相变硬化区和基体三个区域。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,可以掌握金属表面激光重熔过程加热和冷却规律,为制备高性能表面改性层选择合适的工艺参数提供依据。
According to the theory of heat transfer and numerical simulation, the distribution law of temperature field is studied. Taking the thermal physical parameter, heat transfer coefficient and latent heat of phase change into account with the temperature variation, the 45 steel is established by the parametric design language of ANSYS finite element software Surface Laser Remelting Continuous Moving 3D Finite Element Transient Temperature Field Finite Element Model. The results show that increasing the laser power has little effect on increasing the phase change hardening zone, but instead forming a larger molten pool to make the remelting surface rough. Compared with the laser power, the laser scanning speed has little influence on the temperature field of the sample. After laser remelting, the formation of remelting zone, the transformation hardening zone and the matrix of the three regions. The experimental results verify the simulation results well, indicating that the established temperature field calculation model is correct and reliable. Through this calculation model, the rules of heating and cooling of metal surface during laser remelting can be grasped, and the basis for selecting suitable process parameters for preparing high performance surface modification layer is provided.