摘要
为了改善和提高不锈钢TIG电弧增材制造零件的成形质量和力学性能,加入小功率激光对TIG电弧进行诱导增强,对比激光加入前后的电弧形态,研究不同激光功率下制得的增材制造墙体的抗拉强度及微观组织。结果表明:激光的诱导作用能够压缩电弧,稳定堆积过程,提高堆积速度,实现墙体的低热输入堆积,提高墙体的力学性能;墙体的微观组织主要是柱状树枝晶;热量的积累使得墙体从下到上的枝晶间距逐渐增大,墙体从下到上的硬度值逐渐降低;墙体最顶部为等轴树枝晶;激光诱导电弧复合增材制造的316不锈钢墙体由奥氏体和铁素体组成。
A low-power laser is used to induce a TIG arc for improving the surface quality and mechanical properties of the stainless steel components produced via TIG arc additive manufacturing;the arcs before and after laser radiation are compared.Further,the tensile strength and microstructure of the components are investigated at different laser powers.The results denote that the laser induced effect can compress the arc and stabilize the deposition process,resulting in high-speed deposition.The proposed methodology results in low heat input and improves the mechanical properties of the wall.A columnar dendrite microstructure of the wall is considered.The distance between the dendrites from the bottom to the top gradually increases,whereas the hardness decreases.The top of the wall exhibits an equiaxed dendrite microstructure.The 316 stainless steel produced by laser-induced arc additive manufacturing comprises austenite and ferrite.
作者
李旭文
宋刚
张兆栋
刘黎明
Li Xuwen;Song Gang;Zhang Zhaodong;Liu Liming(Key Laboratory of Advanced Connection Technology of Liaoning Province,School of Materials Science and Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2019年第12期93-101,共9页
Chinese Journal of Lasers
基金
国家重点研发计划(2018YFB1107900)
大连市高层次人才创新支持计划(2017RQ102)
关键词
激光技术
增材制造
316不锈钢
激光诱导电弧
力学性能
微观组织
laser technique
additive manufacturing
316 stainless steel
laser-arc hybrid
mechanical properties
microstructure
