【摘要】 激光3D打印中的温度场对微观组织结构具有重大影响，传统双椭球体热源模型在模拟激光选区熔化(selective laser melting, SLM)过程中，尤其是在预测熔池深度方面存在精度不足的问题。提出一种基于各向异性增强导热率的三维传热模型，可以精准预测不同工艺参数下的激光选区熔化(SLM)温度场。通过单道扫描实验表征微观熔池形貌，分析激光功率和扫描速度对熔池基本尺寸的影响规律，并利用实验结果对仿真模型进行验证，依此建立导热率各向异性增强因子与激光能量输入的预测模型。研究结果表明，各向异性传热模型的数值模拟结果与实验数据高度一致，此成果提高了SLM数值模拟的效率和精度。更多还原

【Abstract】 The temperature field in laser 3D printing has a significant impact on the microstructure. The traditional double ellipsoidal heat source model has limitations in simulating the selective laser melting(SLM) process, especially in predicting the depth of the melt pool. This paper proposes a three-dimensional heat transfer model based on anisotropic enhanced thermal conductivity, which can accurately predict the temperature field of SLM under different process parameters. Single-pass scanning experiments were conducted to characterize the micro melt pool morphology and analyze the effect of laser power and scan speed on the basic dimensions of the melt pool. The experimental results were used to validate the simulation model. Based on this validation, a predictive model relating the anisotropic thermal conductivity enhancement factor to laser energy input was established. The results show that the numerical simulation results of the anisotropic heat transfer model are highly consistent with the experimental data, demonstrating that the proposed model improves the efficiency and accuracy of SLM numerical simulation.更多还原