摘要
采用电弧增材制造工艺制备了5356铝合金成形试样。通过观察合金微观组织及对拉伸性能研究发现,电弧增材制造5356铝合金成形质量良好、冶金结合优良,气孔率为0.38%优于大多数焊接样品,未出现较大缺陷;试样显微组织主要由α(Al)基体和弥散强化相β(Al3Mg2)组成,在沉积态试样中由于非平衡凝固造成合金元素偏析和富集,经420℃/18 h均匀化退火处理元素分布均匀性得到改善;沉积态试样在不同方向取样试样中平均抗拉强度分别为267,277 MPa,均能达到AWSA5.01/A5.10标准规定值,均匀化退火后增材制造5356铝合金的强韧性同时得到提高,远远超过5356铝合金的焊接性能,元素均匀化及β相的弥散析出是均匀化处理试样性能改善的主要原因;室温拉伸试样的断口位置出现明显颈缩;沉积态断口表面较为平缓,均匀化退火后断口表面出现明显起伏;断口表面分布有细小且均匀的韧窝,且均匀化退火后韧窝更为细小。
Wire+arc additive manufacture was used to produce components with 5356-aluminum alloy.Through the study of the microstructure and tensile properties,it was found that the wire+arc additive manufactured(WAAM) 5356-aluminum alloy exhibited good forming quality and excellent metallurgical bonding property.The porosity of the alloy was 0.38% better than that of most welding samples and no obvious defects were found.The microstructure of the sample consisted mainly of α(Al) and β(Al3 Mg2).The non-equilibrium solidification led to segregation and enrichment of elements in the as-deposited sample,but element distribution uniformity was improved after 420℃/18 h homogenization annealing.The average tensile strength of as-deposited samples in different directions was267 and 277 MPa,which reached the AWSA5.01/A5.10 standard value,and the strength and toughness of the 5356-aluminum alloy were improved at the same time after the homogenization and annealing,homogenization of alloy elements and dispersion precipitation ofβ phase were the major factor for the improvement of the annealed samples’ mechanical property.Necking at the fracture position was obvious for the tensile specimen at room temperature.The fracture surface of the as-deposited tensile samples was relatively flat,but it was obviously undulated after homogenization annealing.The surface of the fracture was distributed with fine and uniform dimples,and the dimples were finer after homogenization annealing.
作者
杨光
彭晖杰
李长富
邢飞
刘祥宇
王超
Yang Guang;Peng Huijie;Li Changfu;Xing Fei;Liu Xiangyu;Wang Chao(Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang 110136,China;Liaoning Advanced Materials&Additive Manufacturing Institute,Shenyang 110021,China;Shenyang Zhongke Yu Chen Technology Co.,Ltd.,Shenyang 110021,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2020年第3期249-255,共7页
Chinese Journal of Rare Metals
基金
国家重点研发计划项目(2018YFB1105805,2017YFB1104002)资助。
关键词
电弧增材制造
5356铝合金
显微组织
拉伸性能
断口
Wire+are additive manufacture
5356-aluminum alloy
microstructure
tensile property
fracture
