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中文摘要：
研究了在12 T强磁场下冷却速率对Fe-0.76%C钢中先共析铁素体的显微组织和性能的影响,结果表明：先共析铁素体晶粒的伸长方向与磁场方向的夹角随着冷速度的提高而增大,其原因是高速冷却时原子扩散减弱.在冷却速率相同的条件下,与非磁场热处理样品相比,强磁场热处理样品的先共析铁素体面积明显增加,宏观硬度下降,因为强磁场使Fe-0.76%C钢表现出更明显的亚共析钢特征.
英文摘要：
The microstructure features of proeutectoid ferrite during transformation from austenite to ferrite and the hardness of specimens heat treated at different cooling rates without and with applying a magnetic field （12 T） in the Fe-0.76%C steel were investigated. The results showed that the angle between the major axis of proeutectoid ferrite and the magnetic field direction increases with the cooling rate increasing. The reason is that the diffusion is limited with the cooling rate increasing. At the same cooling rate, the area percentage of proeutectoid ferrite in the specimen heat treated with magnetic field is more than that in the specimen without magnetic field, and the hardness of the specimen heat treated with magnetic field is lower. The main reason is that Fe-0.76%C steel shows more characteristics of proeutectoid steel under magnetic field.
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