An effect of high magnetic field on phase transformation in Fe–C system
An effect of high magnetic field on phase transformation in Fe–C system
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DOI：
10.1016/s0167-577x(99)00263-3
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发表时间：
2000-05
影响因子：
3
通讯作者：
H. Joo;S. Kim;N. Shin;Y. Koo
中科院分区：
文献类型：
--
作者：
H. Joo;S. Kim;N. Shin;Y. Koo
磁场对材料吉布斯自由能的影响取决于其磁化行为。为了研究外加磁场对Fe-Fe3C相图的影响，根据分子场理论计算了奥氏体相、铁素体相和渗碳体相的磁吉布斯自由能。利用计算的吉布斯自由能作为碳的质量分数和在特定磁场下的温度的函数，绘制了Fe-Fe3C系统的相图。相图上移，使得Ac1和Ac3的温度随着外加磁场的增加而增加，但Acm的温度变化几乎与外加磁场的大小无关。讨论了共析温度和成分的提高及其在组织控制中的应用。
The effect of a magnetic field on the Gibbs free energy of a material depends on its magnetization behaviors. To investigate the change in the Fe–Fe3C phase diagram caused by a high external magnetic field, the magnetic Gibbs free energies of the phases austenite, ferrite, and cementite are calculated on the basis of the molecular field theory. Using the calculated Gibbs free energy as a function of weight percentage carbon and temperature at a particular magnetic field, a phase diagram of the Fe–Fe3C system is drawn. The phase diagram is shifted upwards so that the Ac1and Ac3temperatures increase as the magnetic field is applied, but the Acmtemperature change is almost independent of applied magnetic field value. The increase of eutectoid temperature and composition and its application to microstructural control are discussed.