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低合金耐磨铸钢经900℃×30 min奥氏体化热处理后,实验研究了60 min等温时间下不同等温淬火温度对其组织性能的影响。结果表明,当等温温度为270℃时,其组织为细针状下贝氏体+残余奥氏体+少量马氏体复相组成,钢的硬度最高,冲击韧度最小;随着等温淬火温度的升高,钢的组织逐渐向枝叉状贝氏体和带有羽毛状的上贝氏转变,同时钢的冲击韧度总体呈直线上升,硬度大幅度下降;在300～330℃范围内等温淬火钢获得的组织和力学性能最佳,360℃等温淬火时最差。
The effects of different isothermal quenching temperatures on the microstructure and properties of the low alloyed wear-resistant cast steel after austenitizing heat treatment at 900 ℃ for 30 min were studied experimentally. The results show that when the isothermal temperature is 270 ℃, the microstructure is fine needle-shaped lower bainite + retained austenite + small amount of martensite complex phase. The hardness of the steel is the highest and the impact toughness is the least. With the isothermal quenching temperature , The microstructures of the steel gradually changed to the branched bainite and the feathery Upper Bailey. At the same time, the impact toughness of the steel generally increased linearly and the hardness decreased sharply. The isothermal temperature ranged from 300 to 330 ℃ Hardened steel obtained the best mechanical and mechanical properties, 360 ° C isothermal quenching the worst.