高温时效T92/HR3C焊接接头的组织和力学性能  

Microstructure and mechanical properties of T92/HR3C dissimilar steel welding joints after high temperature aging

作　　者：陈国宏[1] 余新海 王家庆[1] 化建 刘俊建 宋有明[3] 张涛[1] 张建华[3] 汤文明[3] 

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

出　　处：《材料热处理学报》2011年第9期89-95,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(KJ2011A221)

摘　　要：对ERNiCrMo-3镍基焊丝钨极氩弧焊(GTAW)焊接的T92/HR3C异种钢管接头,进行650℃直至1143.5 h的高温时效处理,研究时效过程中接头显微组织结构和力学性能的变化规律。结果表明:时效后接头的室温拉伸断口都位于T92母材。随时效时间的延长,接头各区域的冲击韧性单调降低,但接头强度、T92侧热影响区(HAZ)及母材的硬度先降后升,时效501.1 h后趋于稳定,这归因于不同时效时间下T92侧HAZ及母材中碳化物的形态及聚集状态的差异。HR3C侧HAZ产生时效脆化,其冲击断口呈沿晶断裂的断口特征。Using Ni-based welding wires of ERNiCrMo-3,T92/HR3C dissimilar steel joints were prepared by gas tungsten arc welding（GTAW）.After aging at 650 ℃ for time up to 1143.5 h,microstructure and mechanical properties of the welding joints were studied.The results show that tensile fracture of the aged joints always takes place in T92 base metal.As increasing the aging time,the impact toughness values of the joints decrease monotonously,but the tensile strength of the joints and the hardness values of the HAZ and base metal of T92 decrease when aged for 160.5 h and then increase when aged for 501.1 h and 1143.3 h.This is attributed to the different morphology and distribution of the carbides in T92 steel aged for different time.Intergranular impact fracture is observed for HAZ of HR3C steel of the joints after aging,indicating the occuring of age embrittlement.

关 键 词：异种钢焊接 高温时效 组织结构 力学性能 

分 类 号：TG407[金属学及工艺—焊接] TG156.92