摘要
采用基于激光诱导熔化极惰性气体保护(melt inert gas,MIG)电弧焊的增材技术,研究了插补沉积和十字交叉沉积两种不同沉积路径对2319铝合金块体组织性能的影响。结果表明:插补沉积的晶粒细小,柱状晶生长方向一致;十字交叉沉积的晶粒粗大,柱状晶生长方向杂乱无章。在力学性能上,插补沉积和十字交叉沉积的平均硬度分别是97.9 HV和89.2 HV,十字交叉沉积下试件的整体硬度分布更均匀。插补沉积试件的强度和塑性具有各向异性,十字交叉沉积试件的强度和塑性具有各向同性。其中,插补沉积试件沿X方向和Y方向的抗拉强度分别为233.58 MPa和275.52 MPa,延伸率分别为6.34%和11.12%。十字交叉沉积试件在XY平面的极限抗拉强度为251.33 MPa,延伸率为7.68%。研究表明,对于铝合金块体的激光诱导MIG增材技术制造,插补沉积试件在Y方向上的整体组织性能优于十字交叉沉积试件。
Objective Arc additive manufacturing has the advantages such as high stacking rate,high material utilization rate,low equipment cost,and ability to manufacture large components.Aluminum alloy parts with complex structures can be made by wire arc additive manufacturing(WAAM).What is more,WAAM can directly produce a complete component,which greatly simplifies the processing process.However,the aluminum alloy component made by WAAM has the defects of poor forming quality,many defects,and low mechanical properties,while the laser induced arc composite additive(LIACD)technology can effectively improve the forming quality and mechanical properties.Recently,most of research on WAAM of aluminum alloys is still focused on single-channel multi-layer thin-walled parts,but there are few researches on multichannel and multi-layer arc additive manufacturing.Path strategy is the first step of WAAM.In the case of multi-layer and multi-channel,the heat dissipation conditions of different stacking paths are different,resulting in changes in the microstructures and properties of specimens and thus influencing the application fields.The LIACD manufacturing technology is based on arc and supplemented by a laser,which can further improve the forming quality and mechanical properties of arc additive manufacturing.In this paper,the laser induced MIG composite additive manufacturing technology is used to fabricate 2319 aluminum alloys.The effects of two deposition paths,namely unidirectional linear deposition and crisscross deposition,on the microstructures and properties of 2319 aluminum alloy blocks are studied.Methods In this study,a low power pulsed laser-MIG composite heat source is used for resurfacing welding of ER2319 welding wires on the 2219 aluminum alloy substrate.The protective gas used in this experiment is Ar with a mass fraction of 99.99%and a flow rate of 20 L/min.The welding current is 140 A,the average laser power is 300 W,the scanning speed is 450 mm/min,the wire feeding speed automatically matches the welding current
作者
靳佩昕
张兆栋
马紫成
宋刚
刘黎明
Jin Peixin;Zhang Zhaodong;Ma Zicheng;Song Gang;Liu Liming(Key Laboratory of Advanced Connection Technology of Liaoning Province,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2022年第14期133-141,共9页
Chinese Journal of Lasers
基金
国家自然科学基金(U1960111)。
关键词
激光技术
激光诱导电弧
路径
增材制造
2319铝合金
组织性能
扫描电镜
laser technique
laser induced arc
path
additive manufacturing
2319 aluminum alloy
microstructure and property
scanning electron microscope
