等温淬回火温度对低合金耐磨钢力学性能的影响

Influence of Isothermal Quenching and Tempering Temperature on Mechanical Properties of Low Alloy Wear-resistant Steel

在实验材质和热处理时间一定的情况下,分析了奥氏体化温度、等温温度及回火温度对低合金耐磨铸钢力学性能的影响。结果表明:随奥氏体化加热温度的升高,实验钢的硬度总体呈上升趋势,随等温淬火温度的升高,钢的冲击韧度在330℃等温淬火时先上升后下降,而在360℃与390℃等温淬火时先下降后回升;随回火温度的升高,硬度总体呈下降趋势,而冲击韧度先上升后迅速下降又呈直线上升。当热处理工艺为900℃×30min奥氏体化+330℃×45min等温淬火+260℃×2h回火空冷时钢的综合力学性能最佳。

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 fast 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 ℃ x 30 min austenitizing ＋330 ℃ x 45 min isothermal temperature＋260 ℃ x 2 h tempering, the comprehensive mechanical properties is best.