核电站接管安全端异种金属焊接接头残余应力预测的研究现状  

Research Status of Residual Stress Prediction of Dissimilar Metal Weld Joints of Nozzle to Safe-End in Nuclear Power Plant

作　　者：郭舒[1] 王海涛[1] 韩恩厚[1] GUO Shu;WANG Haitao;HAN Enhou(Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,核用材料安全与评价重点实验室,沈阳110016

出　　处：《机械工程材料》2021年第10期1-12,共12页Materials For Mechanical Engineering

摘　　要：接管安全端异种金属焊接接头是压水堆核电站中连接主设备低合金钢压力容器接管嘴与不锈钢管道的一种典型结构,易发生一次侧应力腐蚀开裂,而焊接残余拉应力是造成此种应力腐蚀开裂的主要因素之一。因此,准确评估接管安全端异种金属接头的焊接残余应力分布至关重要。通过有限元模拟研究焊接残余应力旨在保障核电设备的结构完整性。介绍了接管安全端异种金属焊接接头的结构、材料与焊接工艺特点,综述了有限元模拟方法预测异种金属焊接接头残余应力分布的数值计算工作和典型流程,以及诸多因素对有限元模拟异种金属焊接接头残余应力的影响。The nozzle to safe-end dissimilar metal weld joint is a typical structure in pressurized water reactor power plant connecting the low alloy steel pressure vessel nozzle of the main equipment and the austenitic stainless steel pipe,which is susceptible to primary water stress corrosion cracking.The welding residual tensile stress is one of the primary drivers of this stress corrosion cracking.Thus,accurate estimation of the welding residual stress distribution within the nozzle to safe-end dissimilar metal weld joint is of great significance.Investigating the welding residual stress by finite element modeling aims to ensure the structural integrity of nuclear equipments.The structures,materials and welding process characteristics of the nozzle to safe-end dissimilar metal weld joints are described.The numerical calculation works and typical processes of the residual stress distribution inside the dissimilar metal weld joints predicted by the finite element method,as well as the influence of many factors on finite element modeling residual stresses in dissimilar metal weld joints are reviewed.

关 键 词：接管安全端 异种金属焊接接头 焊接残余应力 应力腐蚀开裂 有限元模拟 

分 类 号：TG457.1[金属学及工艺—焊接]