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Creep life estimation of a service‐exposed P91 cross‐weld joint based on a primary‐secondary creep deformation model

Creep deformation and rupture behavior of welded joints from service‐exposed P91 steel were investigated by creep tests and microstructure examination. A series of miniature tensile creep tests were conducted at 569°C under applied stresses ranging from 182.5 to 286 MPa for the heat‐affected zone (H...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2023-02, Vol.46 (2), p.654-666
Main Authors: Lok, Vanno, Le, Thi Giang, Yoon, Kee Bong
Format: Article
Language:English
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Summary:Creep deformation and rupture behavior of welded joints from service‐exposed P91 steel were investigated by creep tests and microstructure examination. A series of miniature tensile creep tests were conducted at 569°C under applied stresses ranging from 182.5 to 286 MPa for the heat‐affected zone (HAZ), base metal, and weld metal. Creep deformation behavior was modeled using the experimentally measured creep strain data as the primary creep‐secondary creep (PC‐SC) model and fitting closely with the measured creep curves of each metal. Power‐law type creep equations were employed to describe the primary and secondary creep behavior. The creep rupture life of the cross‐weld specimen was predicted using the PC‐SC model with HAZ properties. An accurate prediction was possible if the stress in estimation was increased to 1.14 times of the actual applied stress. The creep test results with the cross‐weld specimens were used for verification. Applying the Monkman–Grant relationship and the creep damage tolerance factors to the cross‐weld joint life prediction are also discussed. Highlights A method of creep rupture life prediction for a cross‐weld joint was suggested. A combined model of primary creep and secondary creep deformation was employed. Creep constants of HAZ determined by experiments should be used for life estimation. By using 1.14 times of the applied stress, accurate creep life of the cross‐weld was obtained.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13894