采用化学分析、金相观察等方法对冷拔GCr15轴承钢开裂原因进行分析。结果表明,烘烤温度过高,钢材表层产生片状珠光体,使得拉拔变形极不均匀,表层金属流动不均匀产生的附加拉应力超过金属强度极限,造成轴承钢冷拔开裂。 Using chemical analysis, metallographic observation and other methods of cold drawn GCr15 bearing steel cracking analysis. The results show that when the bake temperature is too high, the flake pearlite is produced on the surface of the steel, making the drawing deformation extremely uneven. The additional tensile stress caused by uneven metal flow exceeds the metal strength limit, resulting in the cold drawing and cracking of the bearing steel.