Super-Ni叠层复合材料与18-8钢TIG焊接头区的显微组织  

Microstructure of welding zone of super-Ni laminated composite and 18-8 steel TIG joint

作　　者：夏春智[1] 李亚江[1,2] U.A.Puchkov 王娟[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]Department of Materials Science,Bauman Moscow State Technical University

出　　处：《中国有色金属学报》2010年第6期1149-1154,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50874069);高等学校博士学科点专项科研基金资助项目(200804220020)

摘　　要：采用填丝钨极氩弧焊(TIG)方法对复层厚度仅为0.3mm的Super-Ni叠层复合材料与18-8不锈钢进行焊接试验。焊后对焊缝的微观组织及显微硬度、熔合区附近元素分布等进行分析。结果表明:叠层复合材料与焊缝形成可靠的熔合,Super-Ni复层侧熔合区附近的显微硬度升高(HM190);18-8不锈钢侧焊缝的显微硬度低于不锈钢母材的,不锈钢热影响区的显微硬度最高(290HM);不锈钢一侧热影响区形成δ铁素体和碳化物析出;母材与焊缝间形成Fe与Ni元素的明显过渡,叠层复合材料侧元素过渡区域的宽度为80～85μm,18-8不锈钢侧元素过渡区域的宽度约为20μm;焊接中应使钨极氩弧偏向18-8不锈钢一侧,以避免Ni复层的过度烧损。Super-Ni laminated composite（with 0.3 mm-thick cover layer） and 18-8 stainless steel were welded with filler alloy by tungsten inert gas welding（TIG） .The microstructure,microhardness and element distributions in the welding zone were analyzed.The results show that a valid connection forms between the laminated composite and the weld metal,the microhardness（190 HM） near the fusion zone of Super-Ni cover layer side increases.The microhardness of the welding seam region on 18-8 steel side is lower than that of the base metal,and the highest microhardness（290 HM） appears in the heat-affected zone（HAZ） of 18-8 steel.δferrite and carbide phase form on the HAZ of 18-8 steel side.The transition of Fe and Ni elements obviously occurs between the base metal and the weld,with 80-85μm-wide transition zone near the laminated composite side and about 20μm-wide transition zone near the 18-8 steel side.In the welding process,the welding tungsten arc should be controlled towards the 18-8 steel side to avoid excessive melting loss of the Ni cover layer.

关 键 词：叠层复合材料 钨极氩弧焊 显微组织 元素分布 熔合区 

分 类 号：TG457.19[金属学及工艺—焊接]