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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
  • *Corresponding author for this work
  • China Special Equipment Inspection and Research Institute
  • Guangdong Honghaiwan Power Generation Co., Ltd.
  • Beihang University

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number2789
JournalMaterials
Volume17
Issue number12
DOIs
StatePublished - Jun 2024

Keywords

  • Larson–Miller method
  • in-service P91 steel joints
  • remaining life prediction
  • type IV cracking

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