沉积速率对GWZ932镁合金电弧增材制造组织和性能的影响  

Effect of Deposition Rate on Microstructure and Properties of GWZ932 Alloy Wire Arc Additive Manufactured Thin-Walled Components

作　　者：谢勇 张睿泽 冯晨 陈雷 罗志伟 邓泽[3] 王锋华[3] 王福德 XIE Yong;ZHANG Ruize;FENG Chen;CHEN Lei;LUO Zhiwei;DENG Ze;WANG Fenghua;WANG Fude(Capital Aerospace Machinery Co.,Ltd.,Beijing 100076,China;AVIC Jiangxi Hongdu Aviation Industry Group Company Ltd.,Nanchang 330024,China;Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]首都航天机械有限公司,北京100076 [2]航空工业江西洪都航空工业集团有限责任公司,南昌330024 [3]上海交通大学,上海200240

出　　处：《航空制造技术》2024年第21期38-46,共9页Aeronautical Manufacturing Technology

摘　　要：冷金属过渡电弧增材制造(WAAM)是一种新型的快速成形技术,可以用于制造具有复杂形状的高性能结构件。采用冷金属过渡电弧增材制造工艺在不同的沉积速率下制备了GWZ932镁稀土合金单道多层薄壁构件,并研究了沉积速率对试样的成形质量、微观组织和力学性能的影响。结果表明,在其他成形参数一定时,随着沉积速率从4.5mm/s增加到7.5mm/s,沉积层的熔宽和层高均减小。沉积速率增加,晶粒尺寸减小,这是成形过程中热输入量降低,熔池凝固速度加快导致。构件的力学性能随着沉积速率先增加后降低,在6mm/s沉积速率下合金表现出最佳力学性能,屈服强度、抗拉强度、延伸率分别为161MPa、236MPa和4.5%,力学性能表现出各向同性,断口表现出明显的脆性断裂特征。Wire arc additive manufacturing(WAAM),as a novel rapid prototyping technology,can be applied to fabricate high-mechanical-property components with complex shape.Thin-walled components of GWZ932 alloy were fabricated by WAAM based on cold metal transfer(WAAM-CMT)with different deposition rates,and the microstructure evolution and mechanical properties were studied.The results show that as the deposition rate increases from 4.5 mm/s to 7.5 mm/s,the average height and width of deposition layers both decrease.The reduction of heat input also leads to significant grain refinement.At the deposition rate of 6 mm/s,the alloy shows the best mechanical properties,with the yield strength,tensile strength,and elongation of 161 MPa,236 MPa,and 4.5%,respectively.The mechanical properties exhibit isotropy,and the fracture surface shows obvious characteristics of brittle fracture.

关 键 词：镁稀土合金 电弧增材制造 沉积速率 微观组织 力学性能 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程] TG146.22[一般工业技术—材料科学与工程]