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首页> 外文期刊>Journal of Materials Science >Numerical analysis for migration of austenite/ferrite interface during carburization of Fe
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Numerical analysis for migration of austenite/ferrite interface during carburization of Fe

机译：Fe渗碳过程中奥氏体/铁素体界面迁移的数值分析

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摘要

During isothermal annealing of the ferrite of a binary Fe-C alloy in an appropriate carburization atmosphere at temperatures of 1020-1180 K, the austenite will be formed as a layer on the surface of the ferrite. The migration behavior of the austenite/ferrite interface during the isothermal carburization was numerically analyzed using the diffusion equation describing the flux balance at the interface. However, the diffusion coefficient of C in the austenite monotonically increases with increasing concentration of C. Thus, the composition dependence of the diffusion coefficient was taken into consideration. For the numerical analysis, Crank-Nicolson implicit method was combined with a finite-difference technique. According to the numerical calculation, the parabolic relationship holds between the migration distance of the austenite/ferrite interface and the annealing time. The composition dependence of the diffusion coefficient yields acceleration of the migration. The numerical calculation satisfactorily reproduces the experimental result of the diffusion controlling migration.
机译：在适当的渗碳气氛中，在1020-1180 K的温度下对二元Fe-C合金的铁素体进行等温退火时，奥氏体将在铁素体表面上形成一层。利用描述界面通量平衡的扩散方程，对等温渗碳过程中奥氏体/铁素体界面的迁移行为进行了数值分析。然而，C在C中的扩散系数随着C浓度的增加而单调增加。因此，考虑了扩散系数的组成依赖性。为了进行数值分析，将Crank-Nicolson隐式方法与有限差分技术相结合。根据数值计算，在奥氏体/铁素体界面的迁移距离与退火时间之间保持抛物线关系。扩散系数的成分依赖性产生迁移的加速。数值计算令人满意地再现了扩散控制迁移的实验结果。

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