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采用光学显微镜、扫描电镜以及硬度、冲击等方法对锥形磨浆机磨片用低碳马氏体不锈钢的显微组织、力学性能和失效机理进行了分析。结果表明:该磨片材料显微组织为回火马氏体。M23C6型碳化物在原奥氏体晶界和板条界上析出。定子磨片回火温度较低时,碳化物较少且尺寸较小,硬度高,韧性低;转子磨片回火温度较高时,碳化物较多且尺寸较大,硬度低,韧性好。在服役条件下,锥形磨浆机磨片的磨损以磨粒磨损为主,该磨片材料具有足够的韧性,磨片的硬度是影响磨片使用寿命的关键因素,即硬度越高,耐磨性越好。
The microstructure, mechanical properties and failure mechanism of low-carbon martensitic stainless steel for conical refiner plate were analyzed by optical microscope, scanning electron microscope and hardness and impact methods. The results show that the microstructure of the grinding material is tempered martensite. M23C6 carbide in the original austenite grain boundaries and slab boundary precipitation. When the stator tempering tempering temperature is lower, less carbide and smaller size, high hardness, low toughness; rotor tempering tempering temperature is high, more carbide and larger size, low hardness, good toughness. In service conditions, cone abrasive grinding wear to abrasive wear-based, the abrasive material has sufficient toughness, the hardness of the grinding plate is the key factor affecting the service life of the grinding, that is, the higher the hardness, resistance Grinding the better.