Modelling discontinuous dynamic recrystallization using a physically based model for nucleation
Modelling discontinuous dynamic recrystallization using a physically based model for nucleation
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DOI：
10.1016/j.actamat.2009.07.024
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发表时间：
2009-10-01
期刊：
影响因子：
9.4
通讯作者：
Hutchinson, C. R.
中科院分区：
文献类型：
--
作者：
Cram, D. G.;Zurob, H. S.;Hutchinson, C. R.
建立了不连续动态再结晶（DDRX）过程成核的物理模型，并结合多相塑性和晶粒生长模型来预测应变过程中的宏观应力和晶粒尺寸演变。该成核模型是基于最近对静态再结晶的描述，并考虑了动态变化的子结构尺寸。将模型预测结果与纯Cu的DDRX作为初始晶粒尺寸、变形温度和应变速率的函数进行了比较。该模型定量再现了单峰到多峰应力转变、向稳态应力和晶粒尺寸收敛、应力与晶粒尺寸呈幂律关系等DRX特征。模型中开始成核的临界条件与Gottstein等人的实验确定的临界应力标准相比较。(C) 2009材料学报Elsevier Ltd.出版。版权所有。
A physically based model for nucleation during discontinuous dynamic recrystallization (DDRX) has been developed and is coupled with polyphase plasticity and grain growth models to predict the macroscopic stress and grain size evolution during straining. The nucleation model is based on a recent description for static recrystallization and considers the dynamically evolving substructure size. Model predictions are compared with literature results on DDRX in pure Cu as a function of initial grain size, deformation temperature and strain rate. The characteristic DRX features such as single to multiple peak stress transitions, convergence towards a steady-state stress and grain size, and a power-law relationship between the stress and grain size are quantitatively reproduced by the model. The critical conditions for the onset of nucleation in the model are shown to compare well with Gottstein et al.'s experimentally determined critical stress criteria. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.