【摘要】 40Cr钢球销在调质处理后部分工件发现有纵向裂纹。采用成分分析、硬度分析、金相分析确定此纵向裂纹系淬火前裂纹,提出了相应的防止措施并取得了很好的效果。更多还原

【Abstract】 Longitudinal cracks were found on some of the 40 Cr ball pins after quenching and tempering.The cracks have existed before heat treatment,which was determined by chemical analysis,hardness test and metallographic examination. The corresponding prevention measures are provided and good results have been achieved.更多还原