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采用MPX-2000型销盘式摩擦磨损试验机,研究了TC4合金在空气、纯水和模拟海水环境下与GCr15轴承钢对磨时的磨损行为和磨损机制,评价不同环境介质对TC4合金耐磨性的影响。结果表明:TC4合金在模拟海水中的磨损率始终最高,明显高于其在纯水和空气中的磨损率,且在模拟海水中磨损时TC4合金腐蚀速度大大加快,可见腐蚀和磨损之间存在明显的相互促进作用。TC4合金在模拟海水中形成的润滑膜可以明显降低摩擦系数,因而不同工况下模拟海水中的摩擦系数始终较低,纯水中的摩擦系数略高于海水,而空气中的摩擦系数在0.50及0.75 m·s-1,1.02 MPa时明显高于纯水和海水,在0.75 m·s-1,2.55 MPa时反而略低于纯水和模拟海水。TC4合金在空气中的磨损机制为氧化磨损并伴有一定程度的磨粒磨损和粘着磨损;在纯水中的磨损机制为磨粒磨损;而在模拟海水中则为疲劳磨损和磨粒磨损混合作用机制。
The wear behavior and wear mechanism of TC4 alloy on the wear of GCr15 bearing steel in air, pure water and simulated seawater environment were studied by MPX-2000 pin-plate friction and wear tester. The effects of different environmental media on wear resistance of TC4 alloy Sexual effects. The results show that the wear rate of TC4 alloy in simulated seawater is always the highest, which is obviously higher than its wear rate in pure water and air, and the corrosion rate of TC4 alloy greatly accelerates when it is worn in simulated seawater, showing the existence of corrosion and wear Significantly promote each other. TC4 alloy formed in the simulated seawater lubrication film can significantly reduce the friction coefficient, so the simulation of sea water under different conditions the friction coefficient is always low, the coefficient of friction in pure water slightly higher than the sea water, and the air friction coefficient of 0.50 And 0.75 m · s-1, 1.02 MPa were significantly higher than pure water and seawater, but slightly lower than pure water and simulated seawater at 0.75 m · s-1 and 2.55 MPa. The wear mechanism of TC4 alloy in air is oxidative wear with a certain degree of abrasive wear and adhesive wear; wear mechanism in pure water is abrasive wear; in simulated seawater, fatigue wear and abrasive wear mixed Mechanism.