借助于光学显微镜研究了磁场强度对Fe--0.76 %C合金冷却转变过程的先共析铁素体显 微组织的影响. 结果表明: 随着磁场强度的增强, 该合金的先共析铁素体析出量和共析点的 含碳量均明显增加. 原因可归结为, 强磁场使Fe--C合金的共析点向高温及高含碳量区域移动, 使奥氏体向铁素体转变的初始温度升高. 强磁场使先共析铁素体沿磁场方向伸长, 而且随着 磁场强度的增加, 先共析铁素体的伸长方向与磁场方向之间夹角的平均值逐渐减小. 上述现 象可解释为: 外加磁场使先共析铁素体晶核成为磁偶极子, 并使其周围奥氏体原子作为磁偶 极子更易于沿磁场方向向铁素体晶核扩散.
The present studies are to investigate the microstructural features of proeutectoid ferrite during transformation from austenite to ferrite under different magnetic field strength on Fe-0.76%C alloy. It’s found that the amount of proeutectoid ferrite from austenite to ferrite phase transformatio increased considerably with the increase of magnetic field strength. The carbon content of eutectoid point increases considerably also as the increase of magnetic field strength. The most possible reason is that the magnetic field shifts the eutectoid point to high carbon and high temperatures sides and increases the starting-temperature of the phase transformation from austenite to ferrite. 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 increase of magnetic field strength. the most possible reason is that the preutectoid ferrite became the magnetic dipolar under high magnetic field, and then austenite atom around the preutectoid ferrite as magnetic dipolar was prone to diffusion to ferrite grain along the magnetic field direction.
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