核用镍基焊缝缺陷控制与焊材研制

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英文篇名：Welding defects control for Ni-based weld metal and development of welding material 作者：陆善平 ; 张旭 ; 周辉 ; 莫文林 英文作者：LU Shanping;ZHANG Xu;ZHOU Hui;MO Wenlin;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences; 关键词：镍基焊缝金属 ; 失塑裂纹 ; Nb ; Mo 英文关键词：Ni-based weld metal;;ductility-dip crack;;Nb;;Mo 中文刊名：DHJI 英文刊名：Electric Welding Machine 机构：沈阳材料科学国家研究中心(中国科学院金属研究所);中国科学院核用材料与安全评价重点实验室(中国科学院金属研究所); 出版日期：2019-04-20 出版单位：电焊机 年：2019 期：v.49;No.383 基金：中国科学院重点部署项目(ZDRW-CN-2017-1);; 江苏省重点研发计划项目(BE2018113) 语种：中文; 页：DHJI201904008 页数：5 CN：04 ISSN：51-1278/TM 分类号：55-59

摘要

镍基焊材在核电主设备制备中有着重要的应用,镍基焊材的性能很大程度上决定了核电设备的服役寿命。通过分析镍基焊缝金属焊接过程中常出现的失塑裂纹和点状夹杂两类焊接缺陷,设计并制备了不同Nb、Mo含量的镍基合金焊丝。结果表明,Ti会促进镍基焊缝金属中点状夹杂的出现;随着Nb、Mo含量的增加,镍基合金焊缝金属的室温强度逐渐增加,且焊缝金属的塑性得到大幅提升。Nb、Mo元素的添加,有效地改善了镍基焊缝金属中失塑裂纹与点状夹杂缺陷。通过调整成分获得了满足核电主设备使用要求的镍基合金焊丝。
        Ni-based welding material has a widely application in the fabrication of the key components in nuclear power plants. Two types of welding defects,ductility-dip crack and point-like defect,in the Ni-based weld metals are investigated. Based on the calculation results by Thermo-calc with TTNi8 database,several welding wires containing different Nb and Mo contents are designed and fabricated. The results show that the room temperature strength and plasticity of the weld metals improve as the Nb or Mo content increases,which effectively reduce the ductility-dip cracks and point-like defects. Finally,Ni-based welding wire with high welding defects resistant is obtained,which can meet the use requirements for nuclear power plants.

引文

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