Bainite formation kinetics in high carbon alloyed steel
Bainite formation kinetics in high carbon alloyed steel
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DOI：
10.1016/j.msea.2006.11.173
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发表时间：
2008-05-25
期刊：
影响因子：
6.4
通讯作者：
Sietsma, J.
中科院分区：
文献类型：
--
作者：
Luzginova, N. V.;Zhao, L.;Sietsma, J.
近年来，人们对贝氏体形成的模拟进行了大量的研究。在目前的工作中，一个物理的方法，在文献中提出的实施模式下贝氏体在高碳钢（1重量%）的形成C）。在该模型中，碳扩散被假定为控制贝氏体形成的动力学。在Avrami型分析中考虑成核和生长速率。合金元素的影响仅从热力学角度考虑。对计算结果和模型参数的物理意义进行了讨论。结果表明，扩散法能较好地描述高碳钢中贝氏体的形成动力学。只使用两个拟合参数：第一个占碳晶界扩散，第二个是初始形核位密度。该模型较好地考虑了相变温度的影响，但没有考虑贝氏体形成过程中碳化物的析出以及合金元素对碳扩散系数的影响。(c)2007 Elsevier B.V.保留所有权利。
In recent years, many investigations have been carried out on the modeling of the bainite formation. In the present work, a physical approach proposed in the literature is implemented to model the formation of lower bainite in high carbon steels (1 wt.% C). In this model, the carbon diffusion is assumed to control the kinetics of the bainite formation. Both the nucleation and the growth rates are considered in an Avrami type analysis. The effect of alloying elements is taken into account considering only the thermodynamics of the system. The results and the physical meaning of the model parameters are discussed. It is shown that the diffusional approach gives a reasonable description of bainite formation kinetics in high carbon steel. Only two fitting parameters are used: the first accounts for carbon grain-boundary diffusion and the second is the initial nucleation-site density. The model satisfactorily accounts for the effect of transformation temperature, but does not take into account the carbide precipitation during bainite formation and the effect of alloying elements on the diffusion coefficient of carbon. (c) 2007 Elsevier B.V. All rights reserved.