脉冲磁场处理对超细贝氏体转变的影响

Effect of Pulsed Magnetic Field Treatment on Transformation of Ultrafine Bainite

在低温贝氏体转变孕育期、转变初期和转变全程施加脉冲磁场,研究脉冲磁场对超细贝氏体转变组织和碳原子分布的影响。结果表明,与未加磁场的等温贝氏体转变相比较,贝氏体转变初期和转变全程施加1.5 T脉冲磁场使组织细化,而在孕育期施加1.5 T的脉冲磁场贝氏体转变作用不明显。在贝氏体转变全程施加脉冲磁场强度较小时,贝氏体转变量和形貌上变化不明显,当脉冲磁场强度为1.5 T时,贝氏体转变量明显增多,贝氏体束长度变短,宽度变窄。

In this paper, the pulsed magnetic field was applied during the incubation period, the initial stage of transformation and the whole process of transformation to study the effect of pulsed magnetic field on the transformation structures of ultrafine bainite and carbon atom distribution. The results show that compared with isothermal bainite transformation without magnetic field, 1.5 T pulsed magnetic field was applied to the initial stage of bainite transformation and to the whole process of bainite transformation to make the tissue thin, while the pulsed magnetic field that applied 1.5 T to the incubation period did not show obvious bainite transformation. When the intensity of pulsed magnetic field was weak during the whole process of bainite transformation, the content and morphology of bainite transformation were not obvious. Moreover, when the intensity of pulsed magnetic field was 1.5 T, the bainite transformation increased significantly, the length of bainite bundle became shorter and width narrowed.