针对316L不锈钢金属粉末选择性激光熔化过程,利用ABAQUS有限元软件,考虑了材料热物性参数随温度变化特性和相变潜热的影响,实现了激光高斯热源的移动加载,建立了三维瞬态温度场模型。研究了相同扫描参数下,扫描道与扫描道之间温度的影响和不同搭接率情况下温度影响的变化。模拟结果表明,由于热积累效应,随着扫描道的增加,各扫描道中心点最高温度有小幅度的上升;当前扫描道会对后续扫描道有一定的预热作用,对前一扫描道又会有重新加热的作用,扫描道之间会有一定的相互影响;不同的搭接率形成的温度场差异很大。

A simulation model of three dimensional transient was established to simulate the selective laser melting of 316L stainless steel metal powder using ABAQUS. Thermo physical properties of material with temperature and latent heat of phase change were considered. The Gaussian distributed moving laser beam was also carried out. The influence of temperature between scanning passes under the same processing parameters at different overlapping rate was investigated. The results shows that the maximum temperature of scanning central points risen slightly with the increase of scanning paths because of the heat accumulative effect. The current scanning path will preheat the next scanning path and will reheat the previous scanning path. The scanning paths will influence each other. The different overlap rates will results different temperature fields.