长期高温时效对12Cr1MoV/TP347H异种钢接头组织及碳迁移的影响  

Influence of long-term high temperature aging on microstructure and carbon migration of 12Cr1MoV/TP347H dissimilar steel welded joint

作　　者：王智春[1] 韩哲文[1] 康举[1,2] 王启冰 李英河 冯含 张学华 曾燕屏 WANG Zhi-chun;HAN Zhe-wen;KANG Ju;WANG Qi-bing;LI Ying-he;FENG Han;ZHANG Xue-hua;ZENG Yan-ping(North China Electric Power Research Institute Co Ltd,Beijing 100045,China;Beijing Institute of Petrochemical Technology,Beijing 102617,China;Guohua Jinjie Energy Sources Co Ltd,Yulin 719319,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]北京石油化工学院,北京102617 [3]陕西国华锦界能源有限责任公司,陕西榆林719319 [4]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2022年第4期170-177,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52175286);先进焊接与连接国家重点实验室开放课题研究基金(AWJ-21M13);华北电力科学研究院有限责任公司科技项目(KJZ2021024);大学生研究训练计划项目(2020J00035)。

摘　　要：以镍基焊丝为填充金属,采用手工钨极惰性气体保护焊(TIG)对12Cr1MoV/TP347H异种钢进行焊接,经焊后热处理后,在650℃下对异种钢焊接接头进行长期高温时效,对比研究未时效、时效500和2500 h接头12Cr1MoV侧熔合区附近的析出相演变及碳迁移。结果表明:时效2500 h后,接头12Cr1MoV侧熔合区的冲击性能大幅下降;长期高温时效过程中,碳原子不断向熔合区偏12Cr1MoV侧迁移,形成明显的Cr_(23)C_(6)析出相条带,此外由富碳原子构成的增碳层宽度不断增大,导致该区域附近形成一个硬+软的力学性能薄弱区。Using nickel base welding wire as filler metal,12Cr1MoV/TP347H dissimilar steel was welded by manual tungsten inert gas(TIG)welding.After post weld heat treatment,the dissimilar steel welded joint was aged at 650℃for a long time.The evolution of precipitates and carbon migration near the fusion zone on the 12Cr1MoV side of the joint aged at 650℃for 0 h,500 h and 2500 h were compared.The results show that after aging at 650℃for 2500 h,the impact performance of the fusion zone on the 12Cr1MoV side of the joint decreases greatly.In the long-term high-temperature aging process,carbon atoms continue to migrate to the fusion zone of the 12Cr1MoV side to form an obvious Cr_(23)C_(6) precipitate band.In addition,the width of the carbon-enriched layer composed of carbon rich atoms continues to increase,resulting in the formation of a weak region of hard+soft mechanical properties near the zone.

关 键 词：异种钢焊接接头 铁素体耐热钢 镍基焊缝 熔合区 碳迁移 

分 类 号：TG457.[金属学及工艺—焊接]