Abstract Selective Laser Melting (SLM) technology is a complex process controlled by mass and heat transfer. It is very important to understand the microstructure of single track. This work predicted the single track's microstructure of SLMed AlSi10Mg by calculating the thermal variables and using columnar to equiaxed transition (CET) criterion. Firstly, a high accurate transient three-dimensional finite element model was established with anisotropic thermal conductivities verified by both molten pool dimensions and track surface feature. Secondly, the finite element model was used to accurately predict the thermal variables, such as temperature gradient, cooling rate and solidification rate of the molten pool. Thirdly, a columnar to equiaxed transition criterion was established by connecting the predicted thermal variables and experimental microstructure, the experimental results verified that it can predict the microstructure of SLMed AlSi10Mg very well.

中文翻译：

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使用有限元分析预测选择性激光熔化 AlSi10Mg 的显微组织

摘要 选择性激光熔化（SLM）技术是一种受传质和传热控制的复杂过程。了解单轨的微观结构非常重要。这项工作通过计算热变量并使用柱状到等轴转变 (CET) 准则来预测 SLM 处理的 AlSi10Mg 的单轨道微观结构。首先，建立了高精度瞬态三维有限元模型，通过熔池尺寸和轨道表面特征验证了各向异性热导率。其次，利用有限元模型准确预测熔池的温度梯度、冷却速度和凝固速度等热变量。第三，