Laser-based powder bed fusion, due to its layer-by-layer nature, results in a unique stress profile in a part after the primary production process. The residual stresses are typically tensile near the top, while they are compressive near the bottom of the part. When it is removed without proper precautions, the part will bend excessively. In order to alleviate this deformation, a stress relief heat treatment can be applied. In this paper, such a stress relaxation heat treatment is modelled to investigate the effect of the post-processing parameters. The model uses an Arrhenius-type creep equation to simulate the influence of the heat treatment temperature and dwell time on the stress field in a relatively simple cantilever beam produced in Ti-6Al-4V. Via validation of the simulations, the effect of the heat treatment is shown to be represented accurately. The validated model is used to predict the deformation that results from the residual stresses after heat treating the part under various conditions. The results from the simulations ultimately allow choosing the optimal heat treatment conditions to obtain a given reduction in the residual stress level, while reducing the need for extensive experimental investigations.

基于激光的粉末床融合，由于其逐层的性质，在一次生产过程之后，会在零件中产生独特的应力分布。残余应力通常在顶部附近为拉应力，而在零件底部附近为压应力。如果没有适当的预防措施将其卸下，则零件会过度弯曲。为了减轻这种变形，可以进行应力消除热处理。在本文中，对这种应力松弛热处理进行了建模，以研究后处理参数的影响。该模型使用Arrhenius型蠕变方程来模拟热处理温度和停留时间对Ti-6Al-4V产生的相对简单的悬臂梁中应力场的影响。通过验证仿真，热处理的效果已显示出准确的表现。经过验证的模型可用于预测在各种条件下对零件进行热处理后残余应力导致的变形。仿真结果最终允许选择最佳热处理条件，以实现残余应力水平的给定降低，同时减少了对大量实验研究的需求。