锥形磨浆机磨片用马氏体不锈钢的显微组织和性能

Microstructure and Properties of Martensitic Stainless Steel for Conical Refiner Abrasive Disc

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 microstmcture, mechanical properties and failure mechanism of low-carbon martensitic stainless steel for conical refiner abrasive disc were investigated by optical microscopy, scanning electron microscopy, hardness and impact tests. The results show that the microstmcture of the abrasive disc material is tempered martensite. M23C6-type carbide particles are formed in the prior austenitc grain boundaries and lath boundaries. Less carbide with smaller size, higher hardness and lower toughness are found when abrasive disc stator is tempered at a lower temperature. More carbide with larger size, lower hardness and higher toughness are obtained when abrasive disc rotor is tempered at a higher temperature. In service condition, the main wear mechanism of the abrasive disc is abrasive wear, the abrasive disc material has enough toughness, and the hardness of the abrasive disc is the critical factor for influencing the life. The higher the hardness of the abrasive disc is, the better its wear resistance is.