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首页> 外文期刊>Journal of Manufacturing Processes >Analytical modeling of 3D temperature distribution in selective laser melting of Ti-6Al-4V considering part boundary conditions
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Analytical modeling of 3D temperature distribution in selective laser melting of Ti-6Al-4V considering part boundary conditions

机译：考虑部分边界条件的Ti-6Al-4V选择性激光熔化过程中3D温度分布的解析模型

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摘要

Selective laser melting (SLM) is widely used in metallic additive manufacturing to create geometrically complex parts, in which temperature distribution directly affects thermal stress and residual stress states of the build. Finite element models were developed by researchers to predict temperature distribution of the build part with a finite volume, but they were computationally expensive. Analytical models were developed based on a semi-infinite medium assumption because a closed-form solution has not been provided to apply the boundary conditions. In this work, an original physics-based analytical model is presented to predict 3D temperature distribution in SLM with consideration of heat transfer boundary conditions so that the effects of build edges and geometries can be considered in the context of a closed-form solution. Heat input from a laser heat source is calculated using point moving heat source solution. Heat loss at part boundaries due to heat conduction, convection, and radiation is calculated by modifying the heat source solution with equivalent power loss and using zero moving velocity. The temperature distribution is obtained based upon linear heat source solution and linear heat loss solution using the superposition principle. Ti-6Al-4 V is chosen to demonstrate the capability of the presented model. Molten pool dimensions are determined by comparing predicted temperatures to material melting temperature, and then validated with documented values in references. Close agreements were observed upon validation. The presented analytical model predicts the 3D temperature distribution in SLM with boundary conditions solved by a closed-form solution for the first time.
机译：选择性激光熔化（SLM）广泛用于金属增材制造中，以制造几何形状复杂的零件，其中温度分布直接影响构件的热应力和残余应力状态。研究人员开发了有限元模型来预测有限体积的构件温度分布，但计算量大。分析模型是基于半无限介质假设而开发的，因为尚未提供适用于边界条件的封闭形式的解决方案。在这项工作中，提出了一种基于物理的原始分析模型，以考虑传热边界条件来预测SLM中的3D温度分布，以便可以在封闭形式的解决方案中考虑构造边缘和几何形状的影响。使用点移动热源解决方案计算从激光热源输入的热量。通过以相等的功率损耗修改热源溶液并使用零移动速度来计算由于热传导，对流和辐射而导致的零件边界处的热损耗。基于线性热源溶液和线性热损失溶液，使用叠加原理获得温度分布。选择Ti-6Al-4 V来演示所提出模型的功能。通过将预测温度与材料熔化温度进行比较，确定熔池尺寸，然后使用参考文献中记载的值进行验证。确认后观察到密切的协议。所提出的分析模型通过边界条件首次解决了边界条件，从而预测了SLM中的3D温度分布。

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