摘要
采用ER5356铝合金焊丝,在AA6061铝合金基板上进行TIG电弧增材制造成形试验,研究焊接电流和预热温度对增材制造成形的影响,分析增材制造成形件的显微组织,并测试其力学性能。结果表明:热输入对铝合金的增材制造成形影响较大,以熔宽作为成形件热输入量指标进行相应电流调节,可实现铝合金的增材制造成形。成形件与基板结合良好,结合处和沉积层层间均为柱状树枝晶,沉积层为等轴晶,顶层由于良好的散热环境,呈现出细小树枝晶向等轴晶转变趋势。成形件的硬度分布较为均匀,平均硬度为71.3 HV。成形件的屈服强度为112 MPa,抗拉强度为255 MPa,伸长率为28.3%,拉伸断裂为典型的韧性断裂。
TIG arc additive manufacturing was carried out by using 5356-aluminum alloy on AA6061-aluminum alloy substrate.And the effect of welding current and preheat temperature on additive manufacturing were researched.The microstructure was analyzed and the sample tensile strength was tested.The results showed that the heat input has a great influence on the additive manufacturing forming of aluminum alloy.The fusion width is used as index of heat input to adjust the current accordingly to realize additive manufacturing forming of the aluminum alloy.The deposition is well bonded to substrate.The columnar dendrite is formed between the bonding zone and layer boundary zone.The equiaxed grain is formed inside a layer.The top layer presents a trend of equiaxed grain transformation of fine dendrite due to its good heat dissipation environment.The hardness distribution of the deposited layer is homogeneity with an average hardness of 71.3 HV.The yield strength of deposited layer is 112 MPa,the tensile strength is 255 MPa and the elongation is 28.3%,the tensile fracture is ductile fracture.
作者
王秋雨
杨可
徐先宜
庄百亮
包晔峰
蒋永锋
WANG Qiuyu;YANG Ke;XU Xianyi;ZHUANG Bailiang;BAO Yefeng;JIANG Yongfeng(College of Mechanical and Electronic Engineering,Hohai University,Changzhou 213022,China;Jiangsu Insti-tute,China Academy of Machinery Science&Technology Co.,Ltd.,Changzhou 213200,China)
出处
《电焊机》
2018年第9期76-80,共5页
Electric Welding Machine
基金
国家重点研发计划资助项目(2017YFE0100100)
河海大学大学生创新创业训练计划项目(201710294059X)
关键词
电弧增材制造
铝合金
成形工艺
微观组织
力学性能
arc additive manufacturing
aluminum alloy
forming technology
microstructure
mechanical properties
