文献类型：期刊文献

英文题名：Cyclic responses and prediction of martensitic steel with hierarchical lath subjected to universal creep-fatigue loading

作者：Ding, Pei-Shan[1];Cai, Tian-Shu[1,2];Zheng, Xiao-Tao[1];Zhao, Peng[3]

机构：[1]Wuhan Inst Technol, Hubei Prov Key Lab Chem Equipment Intensificat & I, Wuhan 430205, Peoples R China;[2]Wuhan Second Ship Design Inst, Wuhan 430064, Hubei, Peoples R China;[3]East China Univ Sci & Technol, MOE, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2026

卷号：116

外文期刊名：EUROPEAN JOURNAL OF MECHANICS A-SOLIDS

收录：;EI(收录号：20253919227155);WOS:【SCI-EXPANDED(收录号:WOS:001584462700001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (52275159) and the Natural Science Fund for Distinguished Young Scholar of Hubei Province (2022CFA059) .

语种：英文

外文关键词：Creep-ratcheting; Stress ratio; Peak holding time; Fracture mechanism; Continuum damage mechanics

摘要：The creep-ratcheting responses of advanced 9-12 %Cr steel with hierarchical martensitic lath structure at 600 degrees C considering the stress ratio of 0.1, 0.3, 0.5, 0.7, 0.9 and 1, as well as different peak holding times are researched. Mechanical responses during creep-ratcheting process including the corresponding anelastic creep recovery and primary creep regeneration, and creep-fatigue fracture and deformation mechanisms are analyzed. Results show that the anelastic recovery and the maximum primary creep regeneration remain nearly constant throughout the entire lifetime, irrespective of peak holding time. However, both of them decrease almost linearly with increasing the stress ratio. Additionally, the creep-ratcheting deformation and rupture mechanism become closer to that of static creep when the stress ratio grows up, judging from the observations of fracture morphology and dislocation patterns. Notably, the creep-fatigue damage accelerates approximately near the half-lifetime for various cases. Moreover, a unified creep-ratcheting superposition constitutive model coupled with continuum damage mechanics introducing the effects of stress ratio and peak holding time is proposed. Validation results demonstrate that the evolutions of creep-ratcheting deformation as well as the corresponding ratcheting and creep components disintegrated from the total creep-ratcheting strain can be predicted with very good accuracy, which is helpful to elucidate the creep-fatigue interaction during the whole lifetime under creep-fatigue conditions.