对BSP52100（相当于GCr15）轴承钢表面裂纹进行分析,发现裂纹附近的微观组织与基体组织基本相同,表明在轧制后工序出现划伤缺陷。用户在后续锻造及加工过程中,表面划伤缺陷将会形成新的缺陷,经金相分析,缺陷部位出现贫碳区域和折叠区域,贫碳深度为0.20～0.25mm,不能满足质量要求。
An analysis was made on the micro surface cracks of BSP52100 (GCr15) bearing steel. The result shows that the microstructure near the crack is basically the same as the matrix structure, which proves that those cracks were the result of scratching in the rolling process. These surface scratches developed into new defects during the subsequent forging and machining process by customer. Residual decarburization in OD (0.25 mm in depth) and residual forging overlap were found near the new defects by metallographic analysis, which could not meet steel sur- face quality standard requirement of customer.
参考文献
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