Cyclic Creep Behavior and Modified Life Prediction of Bainite 2.25Cr-1Mo Steel at 455 °C

Uniaxial static and cyclic creep tests were carried out on bainite 2.25Cr-1Mo steel at 455 °C. Effects of the unloading rate from 0.6 to 39 MPa/s and valley stress duration from 0 to 30 min on the cyclic creep deformation behavior were discussed. The results indicated that the fracture behavior unde...

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Published inMetals (Basel ) Vol. 10; no. 11; p. 1486
Main Authors Jiang, Hao, Ogunmola, Oluwadamilola, Zhao, Zizhen, Li, Bingbing, Chen, Xu
Format Journal Article
LanguageEnglish
Published MDPI AG 01.11.2020
Subjects
2.25Cr-1Mo steel
anelastic recovery
cyclic creep
life predication
static creep
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Summary:Uniaxial static and cyclic creep tests were carried out on bainite 2.25Cr-1Mo steel at 455 °C. Effects of the unloading rate from 0.6 to 39 MPa/s and valley stress duration from 0 to 30 min on the cyclic creep deformation behavior were discussed. The results indicated that the fracture behavior under static and cyclic creep conditions showed a consistent ductile mode. The strain accumulation rate under cyclic creep was significantly retarded as compared with static creep due to the presence of anelastic recovery which was apparently influenced by the unloading conditions. For cyclic creep tests, the unrecoverable strain component determined by a systematic classification of the stress–strain curve was the true damage. A modified life prediction method proposed based on the unrecoverable strain component presented a good life prediction for cyclic creep.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10111486