摘要
采用填丝钨极氩弧焊(TIG)对Mo-Cu合金与18-8不锈钢进行焊接.采用金相显微镜、扫描电镜、显微硬度计及X射线衍射仪等对Mo-Cu/18-8接头的微观组织、显微硬度、元素分布及熔合区附近的物相组成进行分析.结果表明,Mo-Cu合金侧的熔合区为马氏体和奥氏体的混合组织,焊缝和18-8钢侧的熔合区为奥氏体和铁素体双相组织;从Mo-Cu合金到焊缝,Mo元素的扩散过渡促使在熔合区形成了增碳层;Mo-Cu合金侧的熔合区附近主要由Mo,Cu,γ-Fe(Ni),Fe0.54 Mo0.73和Cu3.8 Ni相组成.增碳层和Fe0.54Mo0.73金属化合物的存在导致Mo-Cu合金侧的熔合区硬度较高,显微硬度值达1 200 HV.
The joining of Mo-Cu alloy with 18-8 stainless steel was carried out by tungsten inert-gas arc welding with filler wire.Microstructure,microhardness,element distribution and phase constituents near the fusion zone of Mo-Cu alloy/18-8 stainless steel joint were investigated by using optical microscopy,scanning electron microscop,microhardners and X-ray diffraction method.Results showed that there were mixed phases of martensite and austenite in the fusion zone at side of Mo-Cu alloy and austenite-ferrite dual phase in the weld metal and fusion zone near 18-8 stainless steel.The formation of carbonized layer in the fusion zone was promoted by the diffusion of Mo from Mo-Cu alloy to weld metal.The phase constituents near the fusion zone at side of Mo-Cu alloy were Mo,Cu,γ-Fe(Ni),Fe0.54 Mo0.73 and Cu3.8Ni.The existence of carbonized layer and Fe0.54 Mo0.73 intermetallic compound resulted in a higher microhardness of 1 200 HV.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第12期77-80,117,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51005135)
山东大学自主创新基金资助项目(2010TS068)
关键词
Mo—Cu合金
18—8不锈钢
填丝氩弧焊
微观组织
Mo-Cu alloy
18-8 stainless steel
tungsten inert-gas arc welding with filler metal
microstructure
作者简介
王娟，女，1977年出生，博士，副教授．主要从事咒进材料及特种焊接技术方面的研究．发表论文30余篇Email：jwang@sdu．edu．cn
