Purpose

This paper aims to report on a homogenized model for the anisotropic thermal conductivity of support structures constructed by the laser powder bed fusion (L-PBF) process, and its application to the numerical simulation of the L-PBF process.

Design/methodology/approach

Considering both analytical and numerical approaches, the model is developed across a temperature interval encompassing the entire L-PBF process. Subsequently, the homogenized material properties are incorporated into a thermal finite element model (FEM) of the L-PBF process to consider the effects of the support structures, taking into account their anisotropic properties.

Findings

The simulation results of the L-PBF process indicate that the support structures act as a thermal barrier, retaining more heat in part compared to direct printing on the substrate. The implementation of homogeneous thermal conductivity in the L-PBF process simulation demonstrates its efficiency and potential application to better control heat transfer during part construction.

Originality/value

The homogenized anisotropic thermal conductivity of a support structure has been characterized by both analytical and numerical approaches. Such homogenized anisotropic tensor was implemented in L-PBF numerical simulation. This showed a strong influence of the supports on the temperature distribution and evolution.

中文翻译：

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激光粉末床熔融 （L-PBF） 中支撑结构热研究的均质化方法 – 应用于工艺数值建模

 目的

本文旨在报道激光粉末床熔融 （L-PBF） 工艺构建的支撑结构各向异性热导率的均质化模型，及其在 L-PBF 工艺数值模拟中的应用。

设计/方法/方法

考虑到解析和数值方法，该模型是在包含整个 L-PBF 过程的温度区间内开发的。随后，将均质化的材料属性纳入 L-PBF 工艺的热有限元模型 （FEM） 中，以考虑支撑结构的影响，同时考虑其各向异性特性。

 发现

L-PBF 工艺的模拟结果表明，与在基材上直接打印相比，支撑结构起到热障的作用，在一定程度上保留了更多的热量。在 L-PBF 工艺模拟中实现均匀导热性证明了其效率和潜在应用，可以更好地控制零件制造过程中的热传递。

 原创性/价值

支撑结构的均质各向异性热导率已经通过解析和数值方法进行了表征。这种均匀的各向异性张量是在 L-PBF 数值模拟中实现的。这表明支座对温度分布和演变有很强的影响。