Abstract
In order to find the most suitable heat treatment method of 0.8C-4C-4Mo-1Y steel, the effects of various factors of heat treatment (austenitizing temperature, tempering temperature, and number of times of tempering and sub-zero treatment) on microstrcture, amount of retained austenite, hardness, impact toughness, fracture load and deflection in bending test and wear resistance were investigated. It has been found that the most suitable austenitizing temperature of this steel is 1120±10°C, the suitable codition of tempering is 530-550°C, the suitable codition of tempering is 530-550°C for 2h by 3 times, and it is unsuitable to use a sub-zero treatment for this steel.
