Study on High Temperature Friction and Wear Characteristics of 4Cr9Si2 Valve Steel

Abstract

In order to study the friction and wear characteristics of 4Cr9Si2 valve steel at high temperature, HM1 steel was used as the friction material, and the friction and wear properties of 4Cr9Si2 valve steel under high temperature were investigated on MMU-10G tester. Wear mechanism was discussed. The results show that with the increase of temperature, the friction coefficient and wear amount of 4Cr9Si2 of valve steel are increasing first and then increasing, and the wear amount of the HM1 is increased first and then decreases. 25–200 °C, the friction coefficient and wear amount of the specimens are relatively large, the surface of the specimens was distributed with grooves and adhesive traces, indicating that prevailed wear mechanisms were abrasive wear. When the temperature was between 300 and 500 °C, the friction coefficient and the wear amount are relatively small, convex oxide film appeared on the wear surface, the main wear mechanism were mild oxidation wear and abrasive wear. When the temperature reaches 600 °C, the strength of the specimen decreased obviously, the friction coefficient and the wear amount are sharply increased, and the oxide film on the surface of the friction pair appeared fatigue flake, the predominant wear mechanisms were oxidative wear, abrasive wear and adhesive wear.