Local fracture behavior and integrity assessment of a dissimilar metal welded joint in nuclear power systems
In this paper,fracture tests and microscopic observations were conducted on an Alloy52M dissimilar metal welded joint (DMWJ) between A508 ferritic steel and 316L stainless steel in nuclear power systems.The local fracture behavior in the DMWJ was investigated,and the significance of using local fracture resistance in integrity assessment of the DMWJ was analyzed.The results show that the local fracture resistance in the DMWJ is determined by the local fracture behavior,and which is mainly related to the microstructure and local strength mismatch of materials at the crack locations.The crack growth always deviates to the materials with lower strength,and the crack path deviations are mainly controlled by the local strength mismatch.If the local fracture resistance properties could not be obtained and used for cracks in heat affected zone (HAZ),interface and near interface zone,the use of the J-resistance curves of base metals or weld metals following present codes will unavoidably produce non-conservative (unsafe) or excessive conservative assessment results.In most cases,the assessment results will be potentially unsafe.Therefore,it is recommended to obtain and use local mechanical and fracture resistance properties in the integrity assessment of DMWJs.
Local fracture behavior Dissimilar metal welded joint Integrity assessment Strength mismatch Crack growth path
Guozhen Wang Haitao Wang Fuzhen Xuan Shantung Tu
Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）