Variation of wear behavior of H13 steel sliding against different-hardness counterfaces

摘要

Dry sliding tests for H13 steels sliding against different-hardness counterfaces were performed in air under a load of 50-300N at 25-600? on a pin-on-disk elevated temperature tester. The hardness of the counterface was noticed to appreciably affect the wear behavior of H13 steel. When H13 steel slid against a hard counterface (55 HRC), the wear rate increased with an increase of temperature. As the load increased, the wear rate marginally increased at 25? and 200? but rapidly increased at 400? and 600?. When H13 steel slid against a softer counterface (42 HRC), the wear rate roughly decreased with an increase of temperature besides 600?. As the load increased, the wear rate rapidly increased at 25? but slightly increased at 200?, 400? and 600?. The large variation of the wear behavior of H13 steel was attributed to the competition of the wear-reduced function and the delamination of tribo-oxide layers. At elevated temperature, the tribo-oxide layer readily delaminated under the abrasive action of the hard counterface; conversely, it stably stayed on worn surfaces to take a wear-reduced function for the soft counterface. Adhesive wear prevailed for the hard counterface at 25-200? and the soft counterface at 25?. For the soft counterface at 200-600?, oxidative mild wear prevailed, but for the hard counterface, at 400-600?, a mild-to-severe wear transition of oxidative wear occurred.