研究了非调质中碳钢晶内铁素体形核的影响因素。运用金相显微镜和扫描电子显微镜等设备,从夹杂物的尺寸、分布和种类三方面探究其对晶内铁素体形核长大的作用,进一步为高质量洁净钢冶炼提供理论依据。试验结果表明,夹杂物成分为Al2O3、Ti N、VN等时最佳诱导等轴型铁素体的尺寸为2~4μm;等轴型铁素体包裹夹杂物的分布最有利于铁素体的生长;Mn S析出于Ti N表面非常有助于诱发晶内铁素体。 The influencing factors of ferrite nucleation in non-quenched medium carbon steel were studied. Using the equipment of metallographic microscope and scanning electron microscope, the effect of nucleation and growth of intragranular ferrite on the size, distribution and type of inclusions was explored, which provided a theoretical basis for high quality clean steel smelting. The experimental results show that the optimal induced isocenter ferrite size is 2 ~ 4μm when the inclusions are composed of Al2O3, TiN, VN, etc. The distribution of equiaxed ferrite inclusions is the most favorable for ferrite Growth; Mn S precipitation on the Ti N surface is very helpful to induce intragranular ferrite.