2014 Volume 55 Issue 7 Pages 1104-1108
Effects of magnesium on wear resistance of H13 steel have been investigated. A disc-on-disc configuration with load of 200 N was employed to study the wear behavior. In order to understand wear mechanisms, wear tracks were studied by scanning electron microscopy. The experimental results show that after magnesium treatment finer carbides were precipitated and the hardness increased with the increasing of magnesium content, which can improve the wear resistance. The specimen without magnesium treatment has the lowest wear resistance and the mode of wear is adhesive. With increase of magnesium content, the degree of oxide patches coverage increased result in the wear rate decreased gradually. Wear mechanism has been changed from adhesive to oxidative after the magnesium content increased to 10 ppm. In this case, the friction coefficient exhibits a higher fluctuation resulted from the alternative formation and delamination of oxide layers.