Cr-Ni不锈钢带极电渣堆焊接头组织特征分析  

Microstructural characterization of joint by electro-slag surfacing with band-electrode for Cr-Ni stainless steel

作　　者：张志玺[1,2] 包晔峰 杨可[1] 蒋永锋[1] ZHANG Zhixi;BAO Yefeng;Yang Ke;Jiang Yongfeng(College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China;School of Material,Shanghai Dianji University,Shanghai 201306,China)

机构地区：[1]河海大学机电工程学院,江苏常州213022 [2]上海电机学院材料学院,上海201306

出　　处：《电焊机》2021年第5期77-81,I0006,共6页Electric Welding Machine

基　　金：国家自然科学基金(51879089)。

摘　　要：通过采用带极电渣焊在Q235表面堆焊Cr-Ni不锈钢得到堆焊接头试样。金相观察表明:带极电渣堆焊接头的熔合区形貌丰富,存在"小岛"和"半岛"形貌。采用EDS分析横跨"半岛"熔合区的成分特点。从电渣堆焊熔滴过渡和堆焊熔池特点两方面分析了"小岛"和"半岛"的形成机理。堆焊层金相分析表明,堆焊过程中的焊接热输入和冷却速度是影响堆焊组织形貌的主要因素。随着焊接热输入的降低以及冷却速度的提高,堆焊金属中的δ铁素体含量逐渐增加,其形态由蠕虫状和断续状变为细长连续的骨架状,最后呈现为密集粗大的骨架状和板条状。The welded joint specimens are obtained through surfacing the Cr-Ni stainless steel on Q235 by ESW(electro-slag welding)with band-electrode.Metallographic observation shows that there is various microstructure morphology in the fusion zone,where an"island"and a"peninsula"images are observed.The composition characteristics of fusion zone across the"peninsula"are analyzed by EDS.The formation mechanism of"island"and"peninsula"is analyzed from the metal transfer and molten pool characteristics of electro-slag surfacing.Metallographic analysis of the surfacing layer shows that the welding heat input and cooling rate are the main factors affecting the surfacing microstructure morphology.With the decrease of welding heat input and the increase of cooling rate,the content ofδferrite in the deposited metal increases gradually,and its morphology changes from vermicular and intermittent to slender skeletal,finally appears dense and thick skeletal and lathy.

关 键 词：组织形貌 化学成分 δ-γ相变 带极电渣堆焊 

分 类 号：TG455[金属学及工艺—焊接]