1Cr18Ni9Ti不锈钢超窄间隙焊接接头组织与性能分析

发布时间：2018-03-24 05:33

本文选题：CrNiTi奥氏体不锈钢　切入点：超窄间隙焊接　出处：《稀有金属材料与工程》2015年10期

【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。
[Abstract]:The ultra-narrow gap welding test of 1Cr18Ni9Ti austenitic stainless steel was carried out by using ultra-fine particle flux confined arc ultra-narrow gap welding method. The microstructure and properties of the welded joints with ultra-narrow gap are tested and analyzed. The results show that the grains in the weld zone of the ultra-narrow gap welded joints of 1Cr18Ni9Ti austenitic stainless steel are equiaxed. On the other hand, the grains in the weld zone of filling welding and cover welding are coarse columnar crystals, and the matrix of equiaxed and columnar crystals is austenite, A small amount of strip ferrite is distributed in the grain. The filler weld and root weld of the ultra-narrow gap welding joint have the same hardness as the base metal. In addition, the tensile strength, yield strength and elongation of the welded joints with ultra-narrow gap are obviously higher than the minimum values of the corresponding properties of the base metal, in addition to the shrinkage and impact power of the base metal, the hardness of the welds is slightly lower than that of the base metal, and the tensile strength, yield strength and elongation of the welded joints are obviously higher than those of the base metal. The corrosion rate of ultra-narrow gap welded joint is 0.417 g/(m2 / h, which is obviously lower than that of base metal.
【作者单位】：兰州交通大学;
【基金】：国家自然科学基金(51105185)
【分类号】：TG457.11

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