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.
the present studies are to investigate the microstructure features of proeutectoid ferrite during transformation from austenite to ferrite at different cooling rates (0.5℃/min,2℃/min and 5℃/min) without and with applying the magnetic field(12T) on Fe-0.76%C alloy. It’s found that the preutectoid ferrite grains elongated along the magnetic field direction, and the angle between the major axis of proeutectoid ferrite and magnetic field direction was decreased with the cooling rates increasing. The most possible reason is that the preutectoid ferrite became the magnetic dipolar under high magnetic field, but the magnetic dipolar is far away the another one, and the diffusion of atom was weaken at quick relativelycooling rates.
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