Study on the Preparatory Heat Treatment Technology about Two Type Material of Automobile Carburized Gear

This paper is focused on the preparatory heat treatment experiments on two new type alloy steels 22CrMoH and 17CrNiMo6 of the automobile gear.A series of experiments have been carried out on three different technology conditions of normalizing,normalizing and high temperature tempering,and isothermal annealing.Through analyzing the structure and properties of the two materials,160HB-180HB,ferrite and pearlite microstructure are good for machining.A most reasonable preparatory heat treatment plan is put forward——isothermal annealing.