Local fracture properties and dissimilar weld integrity in nuclear power systems
The local fracture properties in a Alloy52M dissimilar metal welded joint (DMWJ) between A508 ferritic steel and 316L stainless steel in nuclear power systems were investigated by using the singleedge notched bend (SENB) specimens. The significance of using the local fracture properties in integrity assessment of DMWJs was analyzed. The results show that the local fracture properties in the DMWJ are determined by fracture mechanism occurring ahead of the crack tips, and they are 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 strength mismatch. If the local fracture resistance properties could not be used for the heat affected zone (HAZ), interface and near interface zone cracks, 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 of all regions of the DMWJ if the complex local mismatch situation is a concern.
Local fracture properties Dissimilar metal welded joint Integrity assessment Strength mismatch Crack growth path
Guozhen Wang Haitao Wang Fu-Zhen Xuan Shan-Tung 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
2012 International Symposium on Structural Integrity 2012国际结构完整性学术研讨会 ISSI 2012
济南
英文
67-74
2012-10-31（万方平台首次上网日期，不代表论文的发表时间）