20钢电弧熔覆制造成形与性能研究  

Study on Arc Cladding Forming and Properties on 20 Steel

作　　者：薛冰 雷卫宁[1,2] 刘骁 陈世鑫 XUE Bing;LEI Weining;LIU Xiao;CHEN Shixin(Jiangsu University of Technology,Changzhou 213001,China;Jiangsu Key Laboratory of Advanced Materials Design and Additive Manufacturing,Changzhou 213001,China)

机构地区：[1]江苏理工学院,江苏常州213001 [2]江苏省先进材料设计与增材制造重点实验室,江苏常州213001

出　　处：《热加工工艺》2021年第9期24-28,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51275222);江苏省自然科学基金项目(BK20161198);江苏省研究生实践创新项目(SJCX190726)。

摘　　要：低碳钢在装备制造中应用广泛,但其零部件易损坏,以20钢为研究对象,采用电弧熔覆修复技术,对其废旧零部件再制造技术进行研究。采用ER49-1低碳钢焊丝,在20钢基板上进行TIG焊电弧熔覆修复试验。通过光学显微镜、扫描电镜、显微硬度仪和拉伸试验机分析熔覆层微观结构及其性能。试验结果表明,电弧熔覆修复试样件焊缝出现细针状铁素体和细针状枝晶形态的珠光体,堆焊层顶端微观组织呈细小树枝晶状。堆覆层平均硬度为208 HV,抗拉强度为418 MPa,屈服强度为395 MPa,伸长率为16%,其力学性能优于母材,可实现20钢零部件的堆覆修复,满足零件修复与表面强化的要求。Low carbon steel is widely used in equipment manufacturing,but its parts are easily damaged.Taking 20 steel as the research object and the remanufacturing technology of its waste parts by arc cladding repair technology was studied.The TIG welding arc cladding repair test was carried out on 20 steel substrate using ER49-1 low carbon steel welding wire.The microstructure and properties of the cladding layer were analyzed by means of optical microscopy,scanning electron microscopy,microhardness tester and tensile test machine.The test results show that the weld of the arc cladding repair specimens has fine acicular ferrite and fine needle-like dendritic pearlite,and the microstructure of the top of the surfacing layer is fine dendrites.The average hardness of the surfacing layer is 208 HV,the tensile strength is 418 MPa,the yield strength is 395 MPa,and the elongation is 16%.The mechanical properties are better than that of the base metal,and the cladding repair of 20 steel parts can be realized to meet the repair and surface strengthening requirements of the parts.

关 键 词：再制造 电弧熔覆 增材制造 20#钢 力学性能 

分 类 号：TG444.74[金属学及工艺—焊接]