摘要
选用新一代核电安全端52M镍基合金异种金属焊接接头(DMWJ)为研究对象,以热影响区中危险位置为初始裂纹所在位置,系统研究了热影响区(HAZ)、熔合区(FZ)和近界面区(NIZ)材料拘束对DMWJ断裂行为的影响,并在此基础上对DMWJ各区域的材料拘束进行优化设计。结果表明,对于热影响区裂纹,当单独改变裂纹所在HAZ区域的强度时,J-R阻力曲线随着HAZ区域材料拘束失配系数(Ms)的增加而单调增加;当单独改变裂纹周边FZ或NIZ区域的强度时,J-R阻力曲线随着FZ或NIZ区域Ms的增加先增加后降低再不变。材料拘束优化后,DMWJ的J-R阻力曲线均明显高于实际DMWJ的J-R阻力曲线,同时改变3个区域的材料拘束失配系数,当Ms(HAZ)∶Ms(FZ)∶Ms(NIZ)=2∶1.4∶0.84时,得到了几倍于目前DMWJ的J-R阻力曲线。
The material constraint is an important factor affecting the fracture behavior of dissimilar metal welded joint(DMWJ).For accurately design,manufacture and structure integrity assessment,is necessary to clarify the influence of material constraint on the DMWJ.However,there is still a lack of a systematic research on the influence of material constraint on the fracture behavior of the DMWJ in the current nuclear power plants,and how to improve the fracture resistance of the DMWJ by the optimal design of the material constraint should be considered.In this work,a 52 M nickel-based alloy DMWJ in nuclear power plants was selected,the initial crack which located in the heat affected zone(HAZ)was manufactured,and the fracture behaviors of the DMWJ under different material constraints of HAZ,fusion zone(FZ)and near interface zone(NIZ)were studied.In addition,the optimal design of the material constraint was investigated.The results show that for the HAZ crack,the J-resistance curves increase monotonously with increasing the strength of HAZ where the crack is located in.And the J-resistance curves increase firstly,then decrease and remain steady with increasing the strength of FZ and NIZ where the crack is nearby.The optimized DMWJs have higher J-resistance curves,and when Ms(HAZ):Ms(FZ)∶Ms(NIZ)=2∶1.4∶0.84,the optimized DMWJ has the highest J-resistance curve which is several times of the current Jresistance curve.
作者
杨杰
王雷
YANG Jie;WANG Lei(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第6期840-848,共9页
Acta Metallurgica Sinica
基金
国家自然科学基金项目Nos.51975378和51605292。
关键词
材料拘束
异种金属焊接接头
断裂行为
优化设计
material constraint
dissimilar metal welded joint
fracture behavior
optimal design
