球墨铸铁复合轧辊掉皮破损形成机理的探讨

An Analysis of the Scaling Failure of the Nodular Iron Composite Polls

论述了热轧过程中球墨铸铁复合轧辊的掉皮破损属于疲劳脆性断裂的原因。介绍了该类轧辊的温度、应力状态、临界裂纹尺寸及内部质量情况。并应用断裂力学理论分析了掉皮破损的成因。提出了减少掉皮破损,延长使用寿命的途径。

It is recognized that the scaling failure of nodular iron composite rolls in hot rolling is a problem of fatigue brittle fracture. The temperature field,stress,critical crack size as well as the interior quality of the rolls are presented. The theory of fracture mechanics is used to explain the cause of the scaling failure. At the same time, the way to extend the durability of the rolls is also studied.