温度和载荷对TC4合金磨损性能的影响

采用MG-2000型销盘式高温磨损试验机对TC4合金在环境温度为25~600℃、载荷为50~250 N时的磨损性能进行了研究。利用SEM、EDS和XRD等对试样磨面和剖面的形貌、成分及结构进行了观察与分析。实验结果表明,在25~300℃,TC4合金的磨损率随着温度的升高而升高。磨面呈犁沟及黏着痕迹,磨损机制为黏着磨损和磨粒磨损。在400℃时,磨面局部被摩擦氧化层所覆盖,磨损率随着载荷的增加缓慢下降,磨损机制为黏着磨损、磨粒磨损和氧化磨损。在500~600℃,磨面大部分被摩擦氧化层所覆盖,磨损率很低且随载荷变化很小,磨损机制为氧化磨损。可见,TC4合金在500~600℃具有优异的耐磨性能。

Effect of Temperature and Load on Wear Performance of TC4 Alloy

The wear performance of TC4 alloy has been investigated under the load of 50~250 N at the ambient temperature of 25~600 oC using an MG-2000 type pin-on-disc high temperature wear tester. The morphology, cross-section morphology, composition and structure of worn surfaces were observed and analyzed with SEM, EDS and XRD. The results show that at 25~300 oC, the wear rate of TC4 alloy increases with the increase of the temperature. The worn surface displays the furrow and adhesive traces; the wear mechanisms are adhesive and abrasive wear. At 400 oC, the worn surface is partly covered by tribo-oxides, and the wear rate decreases slowly with the increase of the load. The wear mechanisms are adhesive and abrasive wear as well as oxidative wear. At 500~600 oC, the worn surface is mostly covered by tribo-oxides, the wear rate is very low and its variation is small. In this case, the wear mechanism is oxidative wear. Thus, TC4 alloy possesses excellent wear resistance at 500~600 oC