Heat treatment and wear resistance of 55SiMoV roller for the mine roller bit

By orthogonal test,the paper analyzes two following heat-treatment methods for 55SiMoV rollers:one is carburizing and quenching,and the other is direct quenching.Then,friction pairs are made up of 20CrNiMo jaws with surfaces of different carbon contents and quenching hardness and them。Their wear experimental results and wear morphology show that the average wear capacity of 55SiMoV carburizing and quenching is lower than direct quenching by 22.8%,and the average wear capacity of the friction pair is lower than the direct by 12.5 %.