锰含量和热处理对中碳低合金耐磨铸钢强韧性的影响
Influence of Mn Content and Heat Treatment on Strength-toughness of Medium-carbon-low-alloy Cast Steel
张 懿, 唐建新
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作者单位：(四川大学 制造学院, 四川 成都 610025)
中文关键字：马氏体； 硬度； 冲击韧度
英文关键字：martensite; hardness; impact toughness
中文摘要：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(253 J/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。
英文摘要：The influences of Mn content and quenching temperature on microstructure and properties of medium-carbon-low-alloy wear-resistant cast steel were investigated. The results show that the hardness increases gradually but not significant, the impact toughness first increases and then drops down with the increase of Mn content, and the optimal impact toughness (253 J/cm2) can be obtained when Mn content is 1.64%. The hardness and impact toughness increase at first and then drop down with the increases of quenching temperature. The optimal mechanical property of the tested steel can be obtaind by quenching at 880 ℃ and tempering at 250 ℃. SEM analysis finds obvious dimple-crack characters on the fracture surface of the tested steel, and the fracture mechanism is plastic fracture.