镍基合金NS1402 TIG焊接头组织力学性能与耐蚀性能研究  

Microstructure,mechanical properties and corrosion resistance of the Ni-based alloy NS1402 TIG welded joints

作　　者：周广涛[1] 崔黎林 郑淮北 张洪涛[3] Zhou Guangtao;Cui Lilin;Zheng Huaibei;Zhang Hongtao(College of Mechanical Engineering and Automation,Huaqiao University,Xiamen 361021,Fujian,China;Chengdu Advanced Metal Materials Industry Technology Research Institute Co.,Ltd.,Chengdu 610305,Sichuan,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China)

机构地区：[1]华侨大学福建省特种能场制造重点实验室,福建厦门361021 [2]成都先进金属材料产业技术研究院股份有限公司,四川成都610305 [3]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001

出　　处：《钢铁钒钛》2024年第6期177-183,共7页Iron Steel Vanadium Titanium

基　　金：钒钛资源综合利用产业技术创新战略联盟协同项目。

摘　　要：采用TIG焊接方式,以镍基焊丝ERNiFeCr-1作为填充材料对国产镍基合金NS1402进行焊接性研究,并与国外Incoloy825合金进行对比,分析其接头的显微组织和力学性能。同时对比了普通低合金钢焊丝ER50-6对国内外两种合金的焊接性的影响,并研究其接头的耐腐蚀性能。结果表明,镍基合金NS1402接头成型良好,焊缝区组织由大片等轴晶和少量柱状晶组成;拉伸试样从NS1402焊缝处断裂,焊缝接头抗拉强度达到570 MPa,达到母材抗拉强度的89.1%,NS1402的强度及延伸率均略低于进口825合金;对接头拉伸后的断口形貌进行观察和分析,发现镍基合金NS1402焊接接头断口类型为延性断裂,接头断口韧窝的尺寸较小、数量偏多;镍基焊丝ERNiFeCr-1接头的耐腐蚀性能优于普通ER50-6焊丝接头,腐蚀试验结果表明,国产镍基合金NS1402接头耐腐蚀性能与国外Incoloy825接头相当。The weldability of domestic nickel-based alloy NS1402 by TIG welding with nickel-based wire ERNiFeCr-1 as the filler material was studied.The microstructures and mechanical properties of the joints were analyzed compared with the foreign Incoloy825 alloy.At the same time,the effect of common low alloy steel wire ER50-6 on the weldability of the two alloys at home and abroad was compared,and the corrosion resistance of the joints was investigated.The results show that the nickel-based alloy NS1402 joints are well formed,and the weld zone consists of a large area of equiaxial crystals and a small number of columnar crystals.Tensile specimens are broken at the NS1402 welding seam,and the welded joints have a tensile strength of 570 MPa,which is 89.1%of the tensile strength of base metal.The strength and elongation of NS1402 are slightly lower than that of the imported 825 alloy.The fracture morphology of the joints after tensile testing is observed and analyzed.It is found that the fracture morphology of nickel-based alloy NS1402 welded joint exhibits ductile fracture,with a higher number of small-sized dimples on the fracture joints.The corrosion resistance of nickel-based wire ERNiFeCr-1 joint is better than the common ER50-6 wire joints.The corrosion test results show that the corrosion resistance of the domestic nickel-based alloy NS1402 joints and foreign Incoloy825 joints is comparable.

关 键 词：镍基合金NS1402 TIG焊接 力学性能 耐蚀性能 

分 类 号：TG146[一般工业技术—材料科学与工程] TG442[金属学及工艺—金属材料]