摘要
为了获得高质量激光熔覆制件,针对现有研究仅以宏观几何形貌为优化目标的问题,以316L不锈钢为例,提出一种以宏微观特征为目标的工艺优化方法.首先通过全析因设计和回归分析构建熔覆层宏观几何形貌及微观组织同主要工艺参数的经验统计模型,探讨了工艺参数对几何形貌及微观晶粒平均截距的影响规律.然后选用几何形貌和晶粒平均截距作为评价熔覆成形质量的指标,采用复合合意性函数确定了最佳工艺参数和合适工艺窗口,最后验证了该方法可行性和有效性.结果表明,在选择最佳工艺参数的条件下,宏微观特征的统计模型具有较高预测精度,制备的熔覆样件不仅具更高的显微硬度,还具备良好的拉伸性能:屈服强度为439 MPa,抗拉极限为751 MPa,断后伸长率为26%,实现了宏微观特征的优化.
In order to obtain high-quality laser cladding fabricated parts,a process optimization method targeting macroscopic and microscopic characteristics is proposed for 316L stainless steel as an example,based on the problem that existing studies only target geometric morphology for optimization.Firstly,an empirical statistical model of the geometric morphology and microstructure of the cladding layer and the main process parameters is constructed through full factorial design and regression analysis,and the influence of process parameters on the geometric morphology and the average intercept of microscopic grain is discussed.Then,the geometric morphology and the average grain intercept are selected as the indicators for evaluating the quality of cladding,and the optimal process parameters and suitable process range are determined by the composite desirability function.Finally,the feasibility and effectiveness of the method are verified.The results show that under the condition of the best process parameters,the statistical model of macroscopic and microscopic characteristics has high prediction accuracy.The prepared cladding samples not only have higher microhardness,but also have excellent tensile properties:the yield strength is 439 MPa,the tensile strength is 751 MPa,and the elongation is 26%.The process optimization of macroscopic and microscopic characteristics is achieved.
作者
叶超
侯亮
陈云
徐杨
刘文志
王振忠
YE Chao;HOU Liang;CHEN Yun;XU Yang;LIU Wenzhi;WANG Zhenzhong(Xiamen University,Xiamen 36110,China;Haixi Institute of China Academy of Machinery Science and Technology,Sanming 365000,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2023年第3期8-16,I0003,共10页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51905461)。
关键词
激光熔覆
宏观几何形貌
微观组织
工艺优化
laser cladding
geometric morphology
microstructure
process optimization
