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研究了一种超高碳Cr-Si-Mn耐磨铸钢的热处理工艺对钢的微观组织,强韧性,以及静磨料磨损条件下磨损性能的影响。结果表明,随淬火温度的升高,微观组织由细小的隐晶性马氏体过渡到明显的粗针片状马氏体组织。钢的硬度随淬火温度的升高而降低,但冲击韧度升高。在830℃淬火,200℃回火时,钢的硬度约63HRC,冲击韧度约为4 J·cm-2。随回火温度的提高,钢的硬度逐渐下降,韧性的变化不显著。在830℃淬火,200℃回火的条件下,实验钢具有较好的静磨料磨损性能,磨损主要表现为切削机制,耐磨性主要是受硬度影响。
The effect of heat treatment process on the microstructure, toughness and wear resistance of a steel with ultra-high carbon Cr-Si-Mn wear-resistant cast steel was studied. The results show that with the increase of quenching temperature, microstructure changes from small cryptocrystalline martensite to obvious coarse needle-like martensite. The hardness of steel decreases with increasing quenching temperature, but the impact toughness increases. Quenching at 830 ℃, tempering at 200 ℃, the hardness of steel is about 63HRC, impact toughness of about 4 J · cm-2. With the tempering temperature increased, the hardness of steel decreased, the toughness of the change is not significant. Under the conditions of quenching at 830 ℃ and tempering at 200 ℃, the wear resistance of the experimental steel is better than that of the static abrasive. The wear mechanism is mainly the cutting mechanism. The wear resistance is mainly affected by the hardness.