1Cr18Ni9Ti不锈钢超窄间隙焊接接头组织与性能分析  

Microstructure and Mechanical Property of Ultra-narrow-gap Welding Joint of 1Cr18Ni9Ti Stainless Steel

作　　者：郑韶先[1] 杜宝峰[1] 韩峰[1] 时哲[1] 

机构地区：[1]兰州交通大学,甘肃兰州730070

出　　处：《稀有金属材料与工程》2015年第10期2454-2458,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51105185)

摘　　要：采用超细颗粒焊剂约束电弧超窄间隙焊接方法进行了1Cr18Ni9Ti奥氏体不锈钢的超窄间隙焊接试验,并对所得超窄间隙焊接接头的组织及性能进行了测试和分析。结果表明,1Cr18Ni9Ti奥氏体不锈钢超窄间隙焊接接头的根焊焊缝区晶粒为等轴晶,而填充焊和盖面焊的焊缝区晶粒则为粗大的柱状晶。等轴晶和柱状晶的基体均为奥氏体,晶粒内部均分布有少量板条状铁素体。超窄间隙焊接接头的填充焊缝和根焊焊缝具有与母材相当的硬度,而盖面焊缝的硬度则略低于母材。超窄间隙焊接接头除了收缩率和冲击功比母材的略低外,抗拉强度、屈服强度及伸长率明显高于母材所对应性能的最低值。此外,试验还测得超窄间隙焊接接头的腐蚀速率为0.417 g/(m2·h),该值明显低于母材的腐蚀速率。Ultra-narrow-gap welding experiment of 1Cr18Ni9 Ti austenitic stainless steel has been carried out by the method of constricting arc with ultra-fine granular flux, and microstructures and mechanical property of ultra-narrow-gap welding joint have been measured and analyzed. The results indicate that ultra-narrow-gap welding joint of 1Cr18Ni9 Ti austenitic stainless steel takes on equiaxed grains in the backing weld zone and coarse columnar grains in the weld zone of filling bead and cover pass. Equiaxed grain and columnar grain mainly are made of austenite, but there is a small quantity of lath ferrite in the equiaxed grain and columnar grain. Backing weld and filling bead of ultra-narrow-gap welding joint have the similar hardness as base metal, but the hardness of cover pass is lower than that of base metal. The properties of ultra-narrow-gap welding joint are higher than the minimum of corresponding properties of base metal including the tensile strength, yield strength and elongation ratio except reduction of area and impact energy. Besides, corrosion rate of ultra-narrow-gap welding joint is 0.417 g/（m2.h）, which is obviously lower than that of base metal.

关 键 词：1Cr18Ni9Ti奥氏体不锈钢 超窄间隙焊接 接头组织与性能 

分 类 号：TG457.11[金属学及工艺—焊接]