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研究了淬火温度及回火温度对高强韧耐磨铸钢组织和性能的影响。结果表明:淬火温度低于930℃时,材料的硬度随淬火温度的升高而增大;高于930℃时,硬度降低,在930℃出现硬度峰值;冲击韧度随淬火加热温度的升高先降低后增大。随着回火温度的升高,材料的硬度缓慢降低,而冲击韧度值升高。高强韧耐磨铸钢经930℃×2h淬火(油淬)+240℃×2h回火+240℃×2h回火后,具有较高的强韧性,硬度≥54HRC,冲击韧度≥43J/cm2,组织为回火马氏体+少量的残留奥氏体,试样冲击断口为准解理断裂。
The effects of quenching temperature and tempering temperature on microstructure and properties of high strength and wear resistant cast steel were studied. The results show that when the quenching temperature is lower than 930 ℃, the hardness of the material increases with the increase of quenching temperature. When the temperature is higher than 930 ℃, the hardness decreases and the peak value of hardness appears at 930 ℃. The impact toughness increases with quenching temperature First decrease and then increase. With the tempering temperature increases, the hardness of the material decreases slowly, while the impact toughness value increases. High toughness and wear-resistant cast steel after 930 ℃ × 2h quenching (oil quenching) +240 ℃ × 2h tempering +240 ℃ × 2h after tempering, high strength and toughness, hardness ≥ 54HRC, impact toughness ≥ 43J / cm2 , Organized as a small amount of retained austenite martensite austenite, specimen fracture fracture quasi-cleavage.