Analysis of γ → α transformation in a Nb micro-alloyed C–Mn steel by phase field modelling
Analysis of γ → α transformation in a Nb micro-alloyed C–Mn steel by phase field modelling
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DOI：
10.1016/j.actamat.2005.11.014
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发表时间：
2006-03
期刊：
影响因子：
9.4
通讯作者：
M. Mecozzi;J. Sietsma;S. Zwaag
中科院分区：
文献类型：
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作者：
M. Mecozzi;J. Sietsma;S. Zwaag
采用相场模型模拟了含Nb微合金化C-Mn钢在不同奥氏体化温度冷却过程中的γ→α相变。由金相试验得到的初始奥氏体组织和形核条件被设置为模型的输入数据。界面迁移率被视为NbC对相变的影响的代表。它被用来作为一个拟合参数，以优化之间的协议的实验铁素体分数曲线，获得通过XRD，和模拟铁素体分数曲线。当晶化温度从1373 K降低到1173 K时，由于NbC沉淀的存在，γ/α界面迁移率降低。NbC的存在下，相对于界面控制或扩散控制模式的相变的性质有一个明显的效果。
The phase field model is used to simulate the γ→α transformation in a Nb micro-alloyed C–Mn steel during cooling from different austenitisation temperatures. The initial austenitic microstructure and the nucleation conditions, derived by metallographic tests, are set as input data of the model. The interface mobility is taken as representative for the effect of NbC on the phase transformation. It is used as a fitting parameter to optimise the agreement between the experimental ferrite fraction curve, obtained by dilatometry, and the simulated ferrite fraction curve. A decrease of the γ/α interface mobility is found when the austenitisation temperature decreases from 1373 to 1173K as a consequence of the presence of NbC precipitates during austenitisation. The presence of NbC has a distinct effect on the nature of the phase transformation with respect to the interface-controlled or diffusion-controlled mode.