激光定向能量沉积Inconel 718特征与工艺参数优化  

Characteristics and Process Parameters Optimization of Inconel 718 Fabricated via Laser Directed Energy Deposition

作　　者：刘化强 刘江伟 国凯[1,2] 孙杰 Liu Huaqiang;Liu Jiangwei;Guo Kai;Sun Jie(School of Mechanical Engineering,Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of Education,Shandong University,Jinan,Shandong 250061,China;Research Center of Aviation Components Manufacturing Technology and Equipment of Shandong University,Jinan,Shandong 250061,China)

机构地区：[1]山东大学机械工程学院,高效洁净机械制造教育部重点实验室,山东济南250061 [2]山东大学航空构件制造技术与装备研究中心,山东济南250061

出　　处：《应用激光》2021年第1期13-21,共9页Applied Laser

基　　金：国家自然科学基金青年基金资助项目(51905306);中国博士后科学基金资助项目(2018M642650);山东省重点研发计划资助项目(2019GGX104006);山东省博士后创新项目(201902005)。

摘　　要：针对目前激光增材制造Inconel 718成形质量以及力学性能难以控制问题,采用激光定向能量沉积技术在H11钢表面制备了Inconel 718沉积层,研究激光沉积工艺参数对沉积层特征、显微硬度的影响。采用正交试验分析了激光功率、扫描速度、送粉速率对沉积层几何形貌、宽高比、稀释率以及显微硬度的影响规律,并以宽高比、稀释率、显微硬度为目标对工艺参数进行了优化。获得的工艺参数为:激光功率1 800 W,扫描速度10 mm/s,送粉速率19.71 g/min。采用优化的工艺参数可在H11钢表面获得质量良好的沉积层。The current forming quality and mechanical properties of the additively manufactured Inconel 718 alloy are difficult to control. Inconel 718 deposition layer was fabricated on the surface of H11 steel via the technology of laser directed energy deposition to investigate the effect of process parameters on the characteristics and microhardness of the deposition layer. The effects of laser power, scanning speed and powder feeding rate on the geometrical morphology, aspect ratio, dilution rate and microhardness of deposition layer were studied by means of orthogonal experimental. The process parameters were optimized with the aim of aspect ratio, dilution rate and microhardness. The final optimized process parameters were laser power 1 800 W, scanning speed 10 mm/s, powder feeding rate 19.71 g/min. Better quality deposition layer can be obtained by applying optimized process parameters.

关 键 词：激光定向能量沉积 工艺参数 正交试验 Inconel 718 显微硬度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]