镍合金N6等离子弧焊接接头耐蚀性及导电性的分析  

Corrosion Resistance and Electrical Conductivity of Nickel Alloy N6 Plasma Arc Welded Joints

作　　者：王希靖[1] 柴廷玺[1] 刘骁[1] 赵青山[1] 王江[2] 

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,甘肃兰州730050 [2]金川集团股份有限公司,甘肃金昌737100

出　　处：《稀有金属材料与工程》2016年第2期426-430,共5页Rare Metal Materials and Engineering

基　　金：甘肃省科技支撑计划资助项目(1104GKCA051)

摘　　要：采用等离子弧填对镍合金N6进行填充焊丝与不填焊丝的焊接工艺试验。采用金相组织观察、XRD分析、硬度、腐蚀失重试验和电阻率测试等手段,研究了焊接工艺对N6焊缝的组织结构、硬度、耐蚀性及导电性的影响。结果表明,焊接工艺对焊缝的耐蚀性与导电性有重要的影响,填丝焊缝与不填丝焊缝的耐蚀性,较母材有所降低;与填丝焊缝相比,不填丝焊缝的失重腐蚀速度、电阻率均较大;母材与焊缝金属之间的耐蚀性的差异主要取决于焊缝微观组织结构、硬度及夹杂物等因素,电阻率的大小主要与晶粒尺寸、夹杂物等因素有关。The industrial nickel alloy N6 was experimentally studied by plasma arc welding with filler wire and without filler wire. The effects of welding on microstructure, hardness, corrosion resistance and electrical conductivity of nickel alloy N6 were investigated by OM, XRD and testing of hardness, corrosion mass loss as well as resistivity. The results show the significant effects of welding procedure on corrosion resistance and electrical conductivity. The corrosion resistance of the weld with filler wire and without filler wire deceases compared with the base metal. The corrosion rate and resistivity of welded joints without filler wire is larger than that of welded joints with filler wire. The corrosion resistance of the base metal and welded metal is mainly dependent on microstructure, hardness and inclusions. The resistivity is associated with such factors as grain size and inclusions.

关 键 词：镍合金N6 等离子弧焊 焊缝金属 耐蚀性 电阻率 

分 类 号：TG456.2[金属学及工艺—焊接]