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Coupled thermo-mechanical process simulation method for selective laser melting considering phase transformation steels

机译:考虑相变钢的选择性激光熔化耦合热机械工艺模拟方法

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Selective Laser Melting (SLM) is a promising additive manufacturing technology for the production of complex and highly individual parts on short lead time request. Key aspects for the competitiveness of the SLM process are stability and reproducibility. Poorly optimized pre-processing may lead to deviations in structural properties and geometrical accuracy which results in cost and time consuming iterations. Pre-processing assisted by numerical simulations can reduce defects which occur during construction and hence increase the quality of the parts and the efficiency of this technology.This research work aims to describe a method for a non-linear macroscale finite element method simulation (FEM) to predict a detailed temperature history of the material as well as residual stresses and distortions for medium-sized parts. An advanced calculation procedure is introduced to reduce the calculation effort significantly. It offers an alternative for experimental calibration of faster linear simulation methods (Keller and Ploshikhin, 2016). Specimens have been fabricated via SLM and subjected to distortion measurements for the validation of the developed simulation technique. One austenitic and two martensitic stainless steels are included in the investigated materials. Numerical simulations with consideration of the material specific phase transformations properties have been performed, which show a good agreement with experimental measurements. Significant influence of phase transformations for the residual stresses and distortions is observed. (C) 2019 Elsevier Ltd. All rights reserved.
机译:选择性激光熔化(SLM)是一种有前途的添加剂制造技术,用于在短发出时间请求上生产复杂和高度各个部件。 SLM过程竞争力的关键方面是稳定性和再现性。优化的预处理不良可能导致结构性和几何精度的偏差,这导致成本和耗时的迭代。通过数值模拟辅助的预处理可以减少施工期间发生的缺陷,从而提高了零件的质量和本技术的效率。本文研究工作旨在描述非线性宏观度有限元方法模拟(FEM)的方法预测材料的详细温度历史以及用于中型部件的残余应力和扭曲。引入了先进的计算程序以显着降低计算工作。它提供了更快的线性仿真方法的实验校准(Keller和Ploshikhin,2016)的替代方案。通过SLM制造标本,并经受开发仿真技术的验证的失真测量。调查材料中包含一种奥氏体和两种马氏体不锈钢。已经进行了考虑了材料特异性相变性能的数值模拟,这表现出与实验测量的良好一致性。观察到相相转化对残余应力和扭曲的显着影响。 (c)2019 Elsevier Ltd.保留所有权利。

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