借助于光学显微镜研究了磁场(12 T)对Fe-0.76%C合金在807℃奥氏体化保温不同时间(10 min、30min、60 min)后以2℃/min的冷速冷却后,先共析铁素体显微组织的形貌变化.结果表明:在相同奥氏体化保温时间下,经强磁场热处理样品的先共析铁素体的面积分数和晶粒数量明显高于无磁场热处理样品.这可归结为强磁场降低了先共析铁素体形核所需的驱动力.随着奥氏体化保温时间的延长先共析铁素体晶粒沿着强磁场方向伸长的趋势明显变弱.这主要是由于奥氏体晶粒随着奥氏体化保温时间的延长逐渐增大,导致铁素体晶核之间的距离增大,从而造成奥氏体中的Fe原子向先共析铁素体晶粒扩散的距离增大所致.
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