文献类型：期刊文献

英文题名：A physically-based model of cyclic responses for martensitic steels with the hierarchical lath structure under different loading modes

作者：Zhao, Peng[1];Xuan, Fu-Zhen[1];Wang, Cheng[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, MOE Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2019

卷号：124

起止页码：555

外文期刊名：JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS

收录：;EI(收录号：20184706131111);WOS:【SCI-EXPANDED(收录号:WOS:000459368300030)】；

基金：The work was supported by the National Natural Science Foundation of China (Grant nos. 51835003, 51475168, 51475167).

语种：英文

外文关键词：Cyclic softening fatigue; Physically-based model; Dislocations; Lath martensite; Internal stresses

摘要：Stress and strain controlled low cycle fatigue of the modified 9-12% Cr steel with the hierarchical arranged lath martensitic structure were conducted. We found that, apart from microstructure recovery in lath structure, an additional mechanism of reverse avalanche of low angle boundary, associated with the burst-like plastic deformation is responsible for the accelerated softening during stress cycling. These microstructural evolutions can be explicitly represented via deriving different dislocation evolution laws in terms of dislocation annihilation and storage events. Accordingly, a new model is proposed involving the microstructural evolution. Results indicate that the accelerated softening behavior under stress cycling can be reproduced very well by the present model with a very limited number of adjustable parameters. In addition, the model can capture the features of cyclic response and microstructural evolution under both the strain and stress cycling over a wide range of amplitudes. (C) 2018 Elsevier Ltd. All rights reserved.