在实际生产中45钢制件淬火开裂现象较为普遍,尤其是一些形状特殊的零件,往往因淬火裂纹造成零件报废。这不仅造成一定的经济损失,而且延误生产。在FC10型一吨机动翻斗车上的45钢半轴套管过去在调质淬火中出现裂纹,造成报废有时高达20％,为了减少半轴套管的淬火裂纹提高热处理件的合格率,我们对半轴套管出现淬火裂纹的原因进行了分析,找出了预防措施及改进方法,既保证了产品质量,又节省了能源和材料。一、半轴套管的淬裂分析 In the actual production of 45 steel parts quenching cracking phenomenon is more common, especially in some special shape parts, often due to quenching and cracking caused by scrap parts. This not only causes some economic loss, but also delays production. In the FC10 one-ton motor dump truck 45 steel axle sleeve cracks in the quenching and tempering in the past, resulting in scrap sometimes up to 20%, in order to reduce the semi-axial casing quenching cracks to improve the pass rate of heat treatment pieces, we The reasons for the occurrence of quenched cracks on the half-shaft bushing were analyzed, precautionary measures and improvement methods were found, which not only ensured the product quality but also saved energy and materials. First, the half-shaft casing quench cracking analysis