Microstructural damage mechanics-based model for creep fracture of 9%Cr steel under prior fatigue loading
作者： Wei Zhang , Xiaowei Wang , Haofeng Chen , Tianyu Zhang , Jianming Gong
DOI: 10.1016/J.TAFMEC.2019.102269
关键词: Martensite 、 Composite material 、 Creep 、 Fatigue loading 、 Lath 、 Microstructure 、 Fracture (geology) 、 Damage mechanics 、 Dislocation 、 Materials science
摘要: Abstract Predicting the remnant creep fracture life precisely is crucial for ensuring safety of high temperature components. This study presents a microstructural damage mechanics-based model 9%Cr steel under prior fatigue loading. Microstructure observation reveals that decrease dislocation density and growth martensite lath width occurred during process contribute to degradation strength. Particularly, coarsening plays dominated role. To take into account effect loading, kinematic equations represent evolution are proposed in developed model. With model, failure strain at various lifetime factions, amplitudes hold times loading can be satisfactorily predicted, which manifests robust capturing effects loadings. The also shown able accurately predict prolonged deformation other similar after different
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