选择性激光熔化镍基高温合金的工艺优化

采用实验设计田口法及响应面法，对镍基高温合金选择性激光熔化过程中的三个工艺参数（激光功率、扫描速度和扫描间距）进行优化，以成形样品的相对密度作为评价标准，研究工艺参数对最终试样相对密度的影响。基于方差分析、信噪比、主效应图、响应曲线图等，分析各因素及其之间的相互作用对样品相对密度的影响。研究结果表明，不同工艺参数对试样相对密度的影响效果差别很大，其中扫描间距的影响效果最大，其次是激光功率和扫描速度，此外扫描速度与扫描间距的交互作用对于试样相对密度的影响也比较显著。两种不同优化方法获得的最佳工艺参数组合相同，均为激光功率280 W、扫描速度1000 mm·s?1以及扫描间距0.12 mm。

Process optimization of selective laser melting nickel-based superalloy

The experimental design Taguchi method and response surface methodology were used to optimize the process parameters of the selective laser melting for Ni-based superalloy (laser power, scanning speed and scanning spacing). The effect of the process parameters on the relative density of the final samples was determined by using the relative density as the evaluation standard. Based on the analysis of variance, signal-to-noise ratio, main effect diagram, and response curve, the effects of the process parameters and the parameter interactions on the relative density of samples were evaluated. In the results, the effects of the process parameters on the relative density of the final samples vary greatly, the scanning spacing shows the largest effect, followed by laser power and scanning speed. In addition, the interaction between scanning speed and scanning spacing is also significant for the effect on the sample relative density. The best process parameters obtained by two different optimization methods are the same as the laser power is 280 W, the scanning speed is 1000 mm·s?1, and the scanning spacing is 0.12 mm.