Coupled simulation of the influence of austenite deformation on the subsequent isothermal austenite-ferrite transformation
Coupled simulation of the influence of austenite deformation on the subsequent isothermal austenite-ferrite transformation
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DOI：
10.1016/j.actamat.2005.10.055
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发表时间：
2006-03-01
期刊：
影响因子：
9.4
通讯作者：
Li, YY
中科院分区：
文献类型：
--
作者：
Xiao, NM;Tong, MM;Li, YY
采用q态波茨蒙特卡罗法（MC）和晶体塑性有限元法（CPFEM）耦合模拟了二元Fe-C合金中奥氏体变形对随后等温奥氏体-铁素体相变的影响。利用CPFEM模拟了平面应变热压缩引起的初始变形组织特征。基于线性插值方法，将这些特征（包括存储的能量和方向）映射到正六边形晶格上，作为MC模拟的初始参数。模拟结果表明，塑性变形增加了平衡铁素体体积分数，加速了相变动力学。在奥氏体晶内和晶界处储存能量较高的区域以及塑性变形引起的奥氏体晶界区域的扩大可以增加铁素体的有效形核位置。研究了塑性变形对碳原子在奥氏体中的远距离扩散和铁原子在奥氏体/铁素体界面上的短程扩散的影响。这种模拟技术为研究中尺度形变条件下奥氏体-铁素体相变提供了一种新的方法。(c) 2005材料学报Elsevier Ltd.出版。版权所有。
The influence of austenite deformation on the subsequent isothermal austenite-ferrite transformation in binary Fe-C alloys is simulated by coupling a Q-state Potts Monte Carlo (MC) method with a crystal plasticity finite element method (CPFEM). The initial deformed microstructure characteristics induced by the plane strain hot compression are simulated using the CPFEM. Based on a linear interpolation approach, these characteristics, which include the stored energy and the orientation, are mapped onto a regular hexagonal lattice as the initial parameters of the MC simulation. The simulation results reveal that the plastic deformation increases the equilibrium ferrite volume fraction and accelerates the transformation kinetics. The regions with high stored energy at austenite grain interiors and boundaries and the extended austenite grain boundary area induced by plastic deformation can increase the effective ferrite nucleation sites. The effects of plastic deformation on the long-range diffusion of carbon atoms in austenite and short-range diffusion of iron atoms across the austenite/ferrite interface are investigated. This simulation technique provides a novel way for investigating the austenite-ferrite transformation under deformation conditions on a mesoscale. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.