T92/HR3C异种钢焊接接头的组织结构和力学性能  

Microstructure and mechanical properties of T92/HR3C dissimilar steel welding joints

作　　者：刘俊建[1] 陈国宏[2] 余新海 王家庆[2] 化建 宋有明[1] 张涛[2] 汤文明[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]安徽省电力科学研究院,安徽合肥230601 [3]合肥津利能源科技发展有限公司,安徽合肥230601

出　　处：《材料热处理学报》2011年第2期54-60,共7页Transactions of Materials and Heat Treatment

基　　金：安徽省电力科学研究院技术开发基金(2009咨-JS-03);安徽省高校自然科学研究重点项目

摘　　要：采用ERNiCr-3和ERNiCrMo-3两种镍基焊丝,用气体保护钨极电弧焊(GTAW)法实现T92/HR3C异种钢管焊接。研究了接头的显微组织及其力学性能,以及焊后热处理对接头组织结构及力学性能的影响等。结果表明:T92/HR3C异种钢接头焊缝为胞状树枝晶组织,T92侧热影响区(HAZ)主要由过热区、粗晶区及细晶区构成;HR3C侧HAZ没有明显晶粒长大的现象,但晶界、晶内有碳、氮化物析出。ERNiCrMo-3焊接接头的强度、塑性及硬度较高,拉伸断裂位于母材;而ERNiCr-3焊接接头强度、硬度较低,但冲击韧性较高,拉伸断裂位于焊缝。760℃、30 min焊后热处理,有助于改善两种焊接接头的综合力学性能。T92/HR3C dissimilar steel welding joints were produced by gas tungsten arc welding（GTAW） using two Ni-based welding wires of ERNiCr-3 and ERNiCrMo-3,respectively.Microstructure and mechanical properties of the T92/HR3C dissimilar steel welding joints were studied.Effects of post-weld heat-treatment on microstructure and mechanical properties of the joints were also investigated.The results show that the welding seam in the T92/HR3C dissimilar steel welding joints is composed of the Ni-based dendritic cellular structure.The T92 heat effected zone（HAZ） mainly consists of the superheated zone,coarse grain zone and fine grain zone.The grain growth of the HAZ of HR3C steel is not remarkable,however,the cabrides and/or nitrides is detected,precipitating along grain boundaries and inside the grains.The ERNiCrMo-3 welded joints are of higher tensile strength,plasticity and hardness,however,lower impact toughness compared with the ERNiCr-3 welded ones.Under tensile stress,the fracture of the joints takes place at the base metals for the ERNiCrMo-3 welded joints,but at the welding seam for the ERNiCr-3 welded joints.Post-weld heat-treatment can improve mechanical properties of the two T92/HR3C dissimilar steel welding joints.

关 键 词：T92钢 HR3C钢 异种钢焊接接头 焊后热处理 组织 力学性能 

分 类 号：TG407[金属学及工艺—焊接] TG115.2