为了系统分析某厂高碳轴承钢(GCr15)高频探伤缺陷的形成原因，采用ASPEX自动扫描电镜跟踪了冶炼各环节与缺陷相关类型夹杂物的来源和演变。结果表明，造成高频探伤不合格的主要原因存在于基体中的大颗粒MgO-Al2O3夹杂物；冶炼过程中LF工序和中间包是MgO-Al2O3夹杂物产生的主要场所，此类夹杂经VD处理后降低了93.1%；通过提高中间包耐火材料的体积密度和耐压强度，合理降低耐火材料中SiO2和MgO的质量分数，使得中间包耐火材料的侵蚀程度大幅度降低，GCr15轴承钢高频探伤合格率从79%提高到98%。
The formation reasons of defects in high-frequency detection of bearing steel (GCr15) were analyzed systemati-cally,by tracking the source and evolution of inclusions associated with defects in different locations using ASPEX auto-matic scanning electron microscope. The results showed that,large MgO-Al2O3 inclusions existing in steel matrix resulted in the defects. Most of MgO-Al2O3 inclusions are produced in ladle furnace (LF) and tundish locations;the removal rate of MgO-Al2O3 inclusions reached 93.1 percent during vacuum degassing furnace (VD) process. Erosion of tundish refractory reduced significantly and the qualified rate of defect detection of GCr15 bearing steel of enhanced from 79%to 98%by improving the volume density and compressive strength of refractory,and reducing content of MgO and SiO2 in tundish refractory.
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