Process-dependent residual stresses are one of the main burdens to a widespread adoption of laser powder bed fusion technology in industry. Residual stresses are directly influenced by process parameters, such as laser path, laser power, and speed. In this work, the influence of various scan speed and laser power control strategies on residual stresses is investigated. A set of nine different laser scan patterns is printed by means of a selective laser melting process on a bare plate of nickel superalloy 625 (IN625). A finite element model is experimentally validated comparing the simulated melt pool areas with high-speed thermal camera in situ measurements. Finite element analysis is then used to evaluate residual stresses for the nine different laser scan control strategies, in order to identify the strategy which minimizes the residual stress magnitude. Numerical results show that a constant power density scan strategy appears the most effective to reduce residual stresses in the considered domain.

与过程有关的残余应力是激光粉末床熔合技术在工业中广泛采用的主要负担之一。残余应力直接受到工艺参数的影响，例如激光路径，激光功率和速度。在这项工作中，研究了各种扫描速度和激光功率控制策略对残余应力的影响。一组九种不同的激光扫描图案通过选择性激光熔化工艺印刷在镍超合金625（IN625）的裸板上。通过实验验证了有限元模型的有效性，并将模拟的熔池面积与高速热像仪的原位测量进行了比较。然后使用有限元分析来评估九种不同激光扫描控制策略的残余应力，为了确定最小化残余应力幅度的策略。数值结果表明，恒定功率密度扫描策略似乎最有效地减小了所考虑域中的残余应力。