文献类型：期刊文献

英文题名：A dislocation-based constitutive model for the cyclic response of nanolath strengthened steels

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

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

年份：2019

卷号：155

起止页码：475

外文期刊名：INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES

收录：;EI(收录号：20191306690474);WOS:【SCI-EXPANDED(收录号:WOS:000468721800039)】；

基金：The authors are grateful for the supports provided by National Natural Science Foundation of China (51835003, 51475168).

语种：英文

外文关键词：Constitutive model; Heterogeneous coarsening; Cyclic softening; Nanolath strengthened steel

摘要：Cyclic softening behavior at elevated temperature of nanolath strengthened steel was rationalized under different strain amplitudes. Results indicated that the evolution of internal stress components and the coarsening of subgrains are significantly depending on the plastic strain level. This paper proposes a dislocation-based viscoplastic constitutive model to represent the cyclic deformation response especially at low plastic strain level. The heterogeneous coarsening of subgrains is explicitly formulated via employing different evolution laws for multiple dislocation populations. An additional back-stress hardening component is introduced to account for the retarded cyclic softening. The cyclic deformation response and microstructural evolution of a nanolath strengthened steel at high/low plastic strain levels are perfectly reproduced.