作　　者： ; ; ;

机构地区： 山东大学材料科学与工程学院材料液态结构及其遗传性教育部重点实验室

出　　处： 《中国有色金属学报》 2010年第6期1149-1154,共6页

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

领　　域： [金属学及工艺]