强磁场对Fe-0.28%C-3.0%Mo合金中退化铁素体转变的影响

Effect of High Magnetic Field on Ferrite Transformation in Fe-0.28%C-3.0%Mo Alloy

采用等温热处理时外加12T强磁场对Fe-0.28%(质量分数,下同)C-3.0%Mo合金中退化铁素体的转变进行研究。在有、无强磁场条件下,港湾温度附近及以下都得到了退化铁素体。强磁场加速了退化铁素体的转变,升高了退化铁素体转变TTT(temperature-time-transformation)曲线的港湾温度。没有磁场时的港湾温度大概为610℃左右,外加强磁场后港湾温度为640℃左右,这主要是由于强磁场降低了退化铁素体的自由能。

The transformation of degenerate ferrite in an Fe-0.28%-C-3.0%Mo alloy was investigated by isothermal holding under a 12T magnetic field. The degenerate ferrite was observed around and below the bay temperature with and without the magnetic field. The results show that the degenerate ferrite transformation is accelerated by applying a 12T magnetic field. The bay temperature of TTT-curves is raised in magnetic field, i. e. The bay temperature is about 610℃ without a magnetic field whereas it becomes approximately 640℃ with a 12T magnetic field;because the free energy of degenerate ferrite is lowered by a high magnetic field.