双相不锈钢多层多道焊接接头微观组织表征

发布时间：2018-03-09 13:02

本文选题：双相不锈钢　切入点：多层多道焊　出处：《焊接学报》2017年05期 　论文类型：期刊论文

【摘要】：采用钨极氩弧焊制备了双相钢焊接接头,基于热力学方法计算了母材和焊缝的平衡相变过程,采用OM,SEM,EDS,TEM等方法表征了接头不同区域的微观组织.结果表明,焊缝中添加镍显著促进γ形成并抑制Cr_2N析出.焊缝和热影响区γ_1主要包含晶粒边界奥氏体、魏氏奥氏体和晶粒内奥氏体,不同类型的奥氏体呈现显著的成分差异.焊缝和热影响区析出两种类型的γ_2:晶粒内γ_2和晶粒间γ_2.γ_2易于在δ内和δ/γ_1边界处富Ni和N元素而贫Cr和Mo元素的区域析出.Cr_2N主要分布于热影响区的δ内、δ/γ_2边界以及δ/δ边界处.
[Abstract]:The welding joints of dual-phase steel were prepared by TIG welding. The equilibrium phase transition process between base metal and weld was calculated based on thermodynamic method. The microstructure of different regions of the joints was characterized by OMSEMMA-EDSS-TEM. The addition of nickel to the weld significantly promotes 纬 -formation and inhibits Cr_2N precipitation. The weld and HAZ 纬 _ 1 mainly contain grain boundary austenite, Weichlet austenite and intragranular austenite. There are significant differences in composition between different types of austenite. There are two types of 纬 _ 2: 纬 _ 2 in grains and 纬 _ 2 _ 2 in grains. 纬 _ 2 is easy to precipitate in 未 and 未 / 纬 _ 1 boundary where Ni and N are rich and Cr and Mo are poor. Cr2N is mainly distributed in 未, 未 / 纬 -Snap2 boundary and 未 / 未 boundary of heat-affected zone.
【作者单位】：天津大学材料科学与工程学院;天津市现代连接技术重点实验室;
【基金】：国家自然科学基金资助项目(51575382)
【分类号】：TG407

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