Effect of Process Parameters on Residual Stresses, Distortions, and Porosity in Selective Laser Melting of Maraging Steel 300
Effect of Process Parameters on Residual Stresses, Distortions, and Porosity in Selective Laser Melting of Maraging Steel 300
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DOI：
10.3390/met9101042
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发表时间：
2019-10-01
期刊：
影响因子：
2.9
通讯作者：
Matope, Stephen
中科院分区：
文献类型：
--
作者：
Mugwagwa, Lameck;Yadroitsev, Igor;Matope, Stephen
选择性激光熔化（SLM）是最著名的增材制造方法之一，可用于从金属粉末制造功能部件。虽然SLM是一种成熟的金属增材制造技术，但其在工业上的广泛应用仍然受到其固有现象的阻碍，其中之一是高残余应力。残余应力的一些影响，如翘曲和热应力相关的裂纹，不能通过后处理来纠正。因此，建立能够产生最小残余应力大小和相关变形和/或开裂的输入工艺参数组合是至关重要的。本文研究了激光功率、扫描速度和层厚对马氏体时效钢300钢零件残余应力、变形和可达密度的影响，以建立最优的输入参数组合。对工艺结果之间相互依赖关系的分析表明，高残余应力大小导致成品零件的高尺寸变形，而多孔零件遭受相对较低的残余应力和相关变形。
Selective laser melting (SLM) is one of the most well-known additive manufacturing methods available for the fabrication of functional parts from metal powders. Although SLM is now an established metal additive manufacturing technique, its widespread application in industry is still hindered by inherent phenomena, one of which is high residual stresses. Some of the effects of residual stresses-such as warping and thermal stress-related cracking-cannot be corrected by post processing. Therefore, establishing input process parameter combinations that result in the least residual stress magnitudes and related distortions and/or cracking is critical. This paper presents the influence of laser power, scanning speed, and layer thickness on residual stresses, distortions and achievable density for maraging steel 300 steel parts in order to establish the most optimum input parameter combinations. An analysis of the interdependence between process outcomes shows that high residual stress magnitudes lead to high dimensional distortions in the finished parts, whilst porous parts suffer relatively lower residual stresses and associated distortions.