Characteristics of premature creep failure in over-tempered base metal of grade 91 steel weldment

Wang, Yiyu; Zhang, Wei; Wang, Yanli; Zhao, Feng

doi:10.1016/j.ijpvp.2021.104396

Cited by 9 publications

(1 citation statement)

References 25 publications

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“…As a part of the P91 steel pipeline, welded joints have a complex microstructure and mechanical properties, and are the weakest area in the main body of the pipeline. Since the first batch of P91 heat-resistant steel pipes was put into use, there have been several accidents caused by the premature failure of joints [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

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

Yan,

Cai,

Wang

et al. 2024

Materials

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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.

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Section: Introductionmentioning

confidence: 99%