高钒高速钢干滑动磨损性能研究

Study on Wear Properties of High Vanadium Highspeed Steel under Dry Sliding Condition

利用MM-200型滑动磨损试验机测试高钒高速钢的干滑动磨损性能,借助于扫描电镜对其磨损形貌和组织进行观察,探讨磨损机理。结果表明:高钒高速钢耐磨性主要取决于硬度和显微组织。当含碳量低于2.58%时,高钒高速钢耐磨性主要取决于硬度,硬度越高,耐磨性越好;含碳量超过2.58%,其耐磨性主要取决于显微组织,碳化物尺寸越小,分布越弥散,材料耐磨性越好。高钒高速钢干滑动磨损机理为显微切削和疲劳磨损的复合,并且有应力作用下碳化物的碎裂及脱落。

The wear properties of high vanadium high-speed steel were tested under dry sliding condition using MM-200 test machine and the failure behavior and wear mechanisms of the steel were analyzed by SEM. The results show that the wear behavior of the steel depends on the hardness and microstructure. With carbon content below 2.58%, the wear resistance depends on the hardness, and the higher the hardness, the better the wear resistance; with carbon content above 2.58 %, the wear resistance depends on the microstructure, the smaller the carbides and the more uniformly distributed the carbides, the better the wear resistance. The wear mechanism of high vanadium high-speed steel is combined micro-cutting and fatigue wear with carbide particle breaking and peeling off under stress.