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采用自行研制的脉冲磁场发生装置对含Ti低碳钢的凝固过程进行控制,利用金相显微镜、扫描电镜和能谱仪研究不同放电电压条件下的脉冲磁场对钢中夹杂物的析出行为及凝固组织的影响规律,分析不同凝固冷却速度对脉冲磁场细晶化效果的影响。结果表明:随着放电电压的升高,夹杂物的尺寸先减小后增大,晶内铁素体的数量逐渐增多,凝固组织变得更细小;降低凝固冷却速度,可延长脉冲磁场对钢液凝固过程的作用时间,晶粒的细化效果更明显;当放电电压为80 V,凝固冷却速度为60℃/min时,凝固组织几乎全部由细小的相互交错的针状铁素体组成。
The self-developed pulsed magnetic field generator was used to control the solidification process of Ti-containing low carbon steel. The metallographic microscope, SEM and EDS were used to study the precipitation behavior and solidification of inclusions in steel under different discharge voltages. The influence of different solidification cooling rates on the effect of pulverized magnetic field fine crystallization was analyzed. The results show that with the increase of discharge voltage, the size of inclusions decreases first and then increases, and the amount of ferrite in the crystal gradually increases and the solidified microstructure becomes finer. When the cooling rate is reduced, the pulse magnetic field can be lengthened. When the discharge voltage is 80 V and the solidification cooling rate is 60 ℃ / min, the microstructure of the solidified microstructure almost consists of fine acicular ferrite which is staggered with each other.