梁强,徐永航,杜彦斌,何国华,周志杰

• 1:重庆工商大学制造装备机构设计与控制重庆市重点实验室
• 2:重庆工商大学机械工程学院
• 3:广东工业大学机电工程学院

摘要(Abstract)：

为了在20Cr13马氏体不锈钢表面熔覆多道高平整度的15-5PH合金粉末熔覆层，提出一种基于贝叶斯优化、随机森林回归的15-5PH合金粉末激光熔覆工艺参数优化方法。以激光功率、扫描速度、送粉速率设计三因素五水平的全因子实验，并构建工艺参数与单道熔覆层形貌的BO-RF回归预测模型。通过NSGA-Ⅱ算法对单道激光熔覆工艺参数进行多目标优化，获得Pareto最优解集，并利用TOPSIS结合EWM对Pareto解集进行综合评价。基于单道次熔覆层形貌和平顶重叠模型计算单层多道激光熔覆的搭接率，确定出最佳工艺参数组合进行工艺实验。结果表明：采用最佳工艺参数制备的熔覆层表面平整度达到83.5%。采用该优化方法进行多道次激光熔覆可以改善熔覆层的表面平整度和减少后续机械加工余量。

关键词(KeyWords)： 激光熔覆;15-5PH合金粉末;随机森林回归;平整度优化

Abstract:

Keywords:

基金项目(Foundation): 重庆市高校创新研究群体(CXQT21024);; 重庆英才计划“包干制项目”(cstc2022ycjh-bgzxm0056);; 2021年度校内资助项目计划(2152026)

作者(Author): 梁强,徐永航,杜彦斌,何国华,周志杰

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