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研究了锰含量和奥氏体化温度对中碳低合金耐磨铸钢组织和力学性能的影响。结果表明,随Mn含量的逐渐升高,实验钢的硬度略有升高,但变化并不显著;冲击韧度先升高后降低,且在Mn含量为1.64%时达到最高值(253J/cm2)。随奥氏体化温度的升高,实验钢的硬度和冲击韧度先升高后降低;实验钢经过880℃淬火和250℃回火后可以获得硬度与冲击韧度的最优配合。用SEM衍射分析发现,实验钢断口形貌均为韧窝断裂。
The effects of Mn content and austenitizing temperature on microstructure and mechanical properties of medium carbon low alloy wear resistant cast steel were studied. The results show that with the increasing of Mn content, the hardness of experimental steel increases slightly, but the change is insignificant. The impact toughness firstly increases and then decreases, and reaches the highest value (253 J / cm 2 at Mn content of 1.64% ). With the increase of the austenitizing temperature, the hardness and impact toughness of the experimental steel first increase and then decrease. The optimum combination of hardness and impact toughness of the experimental steel after quenching at 880 ℃ and tempering at 250 ℃ can be obtained. SEM analysis shows that the fractographs of the experimental steels are dimpled.