AZ91镁合金GMA增材制造成形工艺及组织性能  

Forming process and microstructure properties of GMA additive manufacture of AZ91 magnesium alloy

作　　者：梁宝山 康金文 武永利 李杰 范霁康 LIANG Baoshan;KANG Jinwen;WU Yongli;LI Jie;FAN Jikang(CRRC Datong Co.,Ltd.,Datong 037000,Shanxi pro.,China;School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu pro.,China)

机构地区：[1]中车大同电力机车有限公司,山西大同037000 [2]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《焊接技术》2024年第12期1-6,I0001,共7页Welding Technology

基　　金：中央高校基本科研业务费专项资金资助(2023303004,30922010921)。

摘　　要：为了探索GMA增材制造工艺在AZ91镁合金构件成形中的应用前景,文中研究了道间偏移量对多层多道镁合金增材成形形貌的影响,并分析了增材成形样件的微观组织和拉伸力学性能。当熔覆道间搭接距离为11 mm时,得到的熔覆层表面最为平整,最大成形偏差为0.85 mm。增材样件微观组织整体可以分为层内区域、层间界面区和搭接界面区,3个区域的晶粒组织均为等轴状细晶组织,其中层间界面区和搭接界面区晶粒大小根据热循环变化有所不同。增材样件不同拉伸方向力学性能接近,其中增材方向抗拉强度为255 MPa,断后伸长率为11%;搭接方向抗拉强度为244 MPa,断后伸长率为10.5%;堆积方向抗拉强度为240 MPa,断后伸长率为10%。In order to explore the application prospects of GMA additive manufacture technology in the forming of AZ91 magnesium alloy components,this paper studied the effect of pass offset on the morphology of GMA additive manufactured multi-layer and multi-pass magnesium alloy,and analyzed the microstructure and tensile mechanical properties of the forming samples.When the overlap distance was 11 mm,the surface of the fusion layer obtained was the smoothest,with a maximum forming deviation of 0.85 mm.The microstructure of additive samples could be divided into intra layer region,interlayer interface region and lap interface region as a whole.The grain structure of the three regions was equiaxed fine grain structure,and the grain size of the interlayer interface region and lap interface region varied according to thermal cycling variation.The mechanical properties in different tensile directions were similar,with a tensile strength of 255 MPa and an elongation after fracture of 11%in the additive direction.The tensile strength in the overlapping direction was 244 MPa,and the elongation after fracture was 10.5%.The tensile strength in the stacking direction was 240 MPa,and the elongation after fracture was 10%.

关 键 词：AZ91镁合金 GMA增材制造 成形工艺 组织性能 

分 类 号：TG422[金属学及工艺—焊接]