Numerical simulation on interfacial creep failure of dissimilar metal welded joint between HR3C and T91 heat-resistant steel

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• 作者：Jianqiang Zhang 张建强 ; Yi Tang ; Guodong Zhang…
• 关键词：dissimilar metal welded joint ; maximum principal stress ; equivalent stress ; creep strain ; stress triaxiality
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：31
• 期：5
• 页码：1068-1074
• 全文大小：1,983 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Chinese Library of Science
  
• 出版者：Wuhan University, co-published with Springer
• ISSN：1993-0437
• 卷排序：31

文摘

The maximum principal stress, von Mises equivalent stress, equivalent creep strain, stress triaxiality in dissimilar metal welded joints between austenitic (HR3C) and martensitic heat-resistant steel (T91) are simulated by FEM at 873 K and under inner pressure of 42.26 MPa. The results show that the maximum principal stress and von Mises equivalent stress are quite high in the vicinity of weld/T91 interface, creep cavities are easy to form and expand in the weld/T91 interface. There are two peaks of equivalent creep strains in welded joint, and the maximum equivalent creep strain is in the place 27-32 mm away from the weld/T91 interface, and there exists creep constrain region in the vicinity of weld/T91 interface. The high stress triaxiality peak is located exactly at the weld/T91 interface. Accordingly, the weld/T91 interface is the weakest site of welded joint. Therefore, using stress triaxiality to describe creep cavity nucleation and expansion and crack development is reasonable for the dissimilar metal welded joint between austenitic and martensitic steel.