Kinetic effects of magnetic field on the γ/α interface controlled reaction in iron
Kinetic effects of magnetic field on the γ/α interface controlled reaction in iron
复制标题
DOI：
10.1063/1.3407512
复制
发表时间：
2010-05
影响因子：
3.2
通讯作者：
T. Garcin;S. Rivoirard;F. Gaucherand;E. Beaugnon
中科院分区：
文献类型：
--
作者：
T. Garcin;S. Rivoirard;F. Gaucherand;E. Beaugnon
通过磁场下的膨胀测量，研究了磁场对铁中奥氏体（γ）向铁素体（α）转变动力学的影响。在Johnson-Mehl-Avrami-Kolmogorov分析框架下，考虑铁素体晶粒的球形生长模式，计算了界面迁移率的Avrami指数和活化能。这些参数受施加16t磁场的影响很小。这表明它们主要与可用于转化的能量总量有关，而不管其来源（无论是磁性的还是化学的）。磁场通过相的吉布斯自由能强烈地影响α/γ热力学平衡，但对相变动力学本身的影响不明显。
The effect of magnetic field on the austenite (γ) to ferrite (α) transformation kinetics is studied in iron by means of dilatation measurements under magnetic field. In the frame of the Johnson–Mehl–Avrami-Kolmogorov analysis and considering a spherical growth mode for the ferrite grains, the Avrami exponent and the activation energy for the interface mobility are calculated. These parameters are found to be weakly influenced by the application of a 16 T magnetic field. This indicates that they are related mainly to the total amount of energy available for the transformation whatever its origin (whether magnetic or chemical). Whereas the magnetic field strongly affects the α/γ thermodynamic equilibrium through the Gibbs free energy of phases, it has a non noticeable influence on the transformation kinetics itself.