Influence of Isothermal Quenching and Tempering Temperature on Mechanical Properties of Low Alloy Wear-resistant Steel
When the experimental materials and heat treatment time are certain,the influences of austenitizing temperature,isothermal temperature and drawing temperature on mechanical properties of low alloy wear-resistant steel were analyzed.The results show that:with the increase of austenitizing temperature,the hardness increases.With the increase of isothermal quenching and tempering temperature,the impact toughness first increases then decreases at the point 330 ℃ of isothermal quenching and tempering temperature,while it first decreases then increases at the points 360 ℃ and 390 ℃ of isothermal quenching and tempering temperature.Along with the isothermal temperature increasing,the overall strength of steel has a descending trend.Meanwhile,the steel impact toughness decreases rapidly after increasing and goes up with linear.When the heat treatment is 900 ℃× 30 min austenitizing +330 ℃× 45 min isothermal temperature+260 ℃× 2 h tempering,the comprehensive mechanical properties is best.