磨盘材料耐汽蚀性研究

Study on Cavitation Resistance of Refiner Plate Materials

采用磁致伸缩汽蚀装置对两种磨盘材料抗汽蚀性进行了对比研究,探讨了碳化物及基体组织对材料耐汽蚀性的影响,同时针对SEM分析了汽蚀发展过程。结果表明,网状碳化物由于割裂基体造成本身更容易脱落,使得材料不耐汽蚀;马氏体基体由于具有良好的强度,因此具有比奥氏体更好的耐汽蚀性。汽蚀造成材料的失效首先从晶界开始,然后导致碳化物或基体发生开裂和脱落。

In this paper, the cavitaion resistance of the two refiner plate materials was tested and compared with magnetostriction equipment. The effect of carbide and matrix on material cavitation resistance was discussed. In addition, the cavitation development process was analyzed by SEM. The results showed that net carbide reduces materials cavitation resistance because it dissevers matrix and causes itself to delaminate more easily. Martensitic matrix has better cavitation resistance than austenitic because of its good strength. Cavition failure begins firstly from grain boundary, and then results in carbide or matrix crack and drop.