【摘要】 通过Image-Pro Plus软件及金相法对GCr15轴承钢连铸坯在不同的连铸因子（过热度、拉速、二冷强度、电磁搅拌条件）下原始块状碳化物的形态、分布及碳偏析指数间的关系进行研究。结果表明，铸坯碳化物按分布、形态分为三类，沿铸坯晶粒边界集中连续、大面积分布的第一类碳化物；沿晶界分布、以“细长枝条态”向晶粒内无规律延伸的第二类碳化物；以单独形态分布在晶界处、边界圆润光滑、分散分布的第三类碳化物，其中断续分布或单独分布的铸坯块状碳化物经过现有轧制加热工艺处理后，液析碳化物级别均为0～0.5级，以此指导连铸最佳配合工艺参数是拉速0.95 m/min，过热度为20～25℃、冷却强度为0.35 L/kg、末端电磁搅拌为350 A、7 Hz。更多还原

【Abstract】 The morphology, distribution and relationship between the original bulk carbides and carbon segregation index of GCr15 bearing steel continuous casting billets under different continuous casting factors(superheat, drawing speed, secondary cooling strength, electromagnetic stirring conditions) were investigated by Image-Pro Plus software and metallographic method. The results show that the heritability of the original bulk carbide of different types of billets, intermittently distributed or individually distributed billet bulk carbide after the existing rolling heating process, the liquid precipitation carbide level is 0-0.5, which guides the best matching process parameters for continuous casting is the drawing speed 0.95 m/min, superheating degree 20-25 ℃, cooling intensity 0.35 L/kg, end electromagnetic stirring 350 A/7 Hz.更多还原