跳到主要导航 跳到搜索 跳到主要内容

Prediction of Residual Life of In-Service P91 Steel Joints Based on Fracture Behavior

  • Kai Yan
  • , Yongjiang Cai
  • , Denghui Wang*
  • , Shichao Zhang
  • , Shuang Yi
  • , Fulai Yang
  • , Zheng Zhang
  • *此作品的通讯作者
  • China Special Equipment Inspection and Research Institute
  • Guangdong Honghaiwan Power Generation Co., Ltd.
  • Beihang University

科研成果: 期刊稿件文章同行评审

摘要

P91 steel and P91 steel joints experience performance degradation after serving for 30,000 h in working conditions. To clarify the damage and failure behavior and remaining life of the joints during subsequent service, further creep testing was conducted on the welded joints of P91 steel that had been in service for 30,000 h at three temperatures: 550 °C, 575 °C, and 600 °C. The fracture surface and the cross-section damage behavior were characterized by SEM and EBSD methods. The results show that there are two types of fracture modes in the joints at different temperatures: ductile cracking occurring at the BM, and type IV cracking occurring in the FGHAZ. The threshold stress for fracture mode transition decreases with an increase in working temperature. Type IV cracking near the HAZ is the main reason for the premature failure of joints during service. And based on the fracture mode, the dual-constant L-M method was proposed to predict the strength of in-service joint materials. The testing data are discussed and classified based on the fracture mode in this method, which has high accuracy and can prevent the premature failure of joints.

源语言英语
文章编号2789
期刊Materials
17
12
DOI
出版状态已出版 - 6月 2024

学术指纹

探究 'Prediction of Residual Life of In-Service P91 Steel Joints Based on Fracture Behavior' 的科研主题。它们共同构成独一无二的学术指纹。

引用此