WC颗粒增强铁基表面复合材料的三体磨料磨损性能研究

设计、制备了一台三体磨料磨损实验机，对该实验机进行了重现性实验。以高铬铸铁为标样，利用该磨损实验机分别考察了WC颗粒体积分数、载荷与表面复合材料相对耐磨性能之间的关系。实验结果表明：本实验机的测试性能是可靠的；复合材料的三体磨料磨损性能与高铬铸铁标样相比有较明显的提高，在同一载荷下．复合材料的相对耐磨性能随着WC颗粒体积分数的增大呈先升高后降低的变化规律，WC颗粒体积分数为27％的复合材料相对耐磨性最高，达到高铬铸铁的5．12倍；而对于同一种复合材料，随着载荷的增大，其相对耐磨性呈增加趋势，其中WC颗粒体积分数为27％的复合材料增加最为明显；复合材料的三体磨料磨损机理为WC对周围组织的屏蔽作用，失效方式为WC颗粒因疲劳而片状剥落。

Study on Three-body Abrasive Wear Performance of Cast Iron Matrix Surface Composites WC Particles Reinforced

A three-body abrasive wear tester was designed and produced successfully, reproducibility experiment was conducted,the relationships among the relative abrasive performance and the volume fraction of WC particles and load were investigated by using the tester, and comparing with high chromium cast iron. The experimental results indicate that the tester exhibits good reproducibility and three-body abrasive wear performance of composites is increased significantly, comparing with high chromium cast iron. With increase in WC particles volume fraction, the abrasive wear performance of composites in a load is improved firstly and decreased secondly, and the composite of containing 27% WC particles volume fraction has the best abrasive wear performance, which is 5.12 times of high chromium cast iron. With increase of load, the abrasive wear performance of a composite is improved,in which the composite of containing 27% WC particles volume fraction is increased visibly. Mechanism of abrasive wear is shield of WC particles to other microstructure, namely shade effect, and failure patter is flaky exfoliation of WC for fatigue.