Effect of creep fracture mode transition of P91 steel welded joints on long-term creep fracture life

被引：0

作者：

Wang, Denghui ^{[1
]}

Gao, Fei ^{[1
]}

Yang, Fulai ^{[1
]}

Yan, Kai ^{[2
]}

Zhang, Zheng ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] China Special Equipment Inspect & Res Inst, Beijing 100029, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 33卷

关键词：

P91 steel welded joint; Type IV cracking; Fracture mechanism; Long-term creep; Creep life prediction; IV CRACKING BEHAVIOR;

D O I：

10.1016/j.jmrt.2024.10.214

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The formation mechanism of the two fracture behaviors and their effects on the creep life of P91 steel welded joints during creep were investigated, and the morphology and microstructure of the two fractures were characterized by SEM and EBSD, and the results were as follows: the change of fracture modes was affected by the creep strain rate and cavity nucleation rate in the joint. When the applied stress is large, the creep strain rate of BM is higher, and brittle fracture occurs at BM; when the applied stress is low, the cavity nucleation rate of FGHAZ is higher, and brittle fracture occurs at FGHAZ, known as type IV cracking. The occurrence of type IV cracking will reduce the accuracy of creep life prediction methods, and life prediction considering fracture mode can effectively improve the prediction accuracy.

引用

页码：6374 / 6388

页数：15

共 32 条

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