回火温度对NM400钢组织和耐磨性能的影响
Influence of Tempering Temperature on Microstructure and Wear Resistance of NM400 Steel
雷爱娣1, 蔡庆伍1, 姚春发2, 武会宾1
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作者单位：(1. 北京科技大学 高效轧制国家工程中心, 北京 100083; 2.中国钢研科技集团 结构材料研究所, 北京 100081)
中文关键字：NM400； 硬度； 马氏体板条； 回火
英文关键字：NM400; hardness; martensite lath; tempering
中文摘要：通过SEM、TEM、EDS等实验技术研究NM400钢板在200～600 ℃回火1 h后的组织、表面硬度、磨损量随回火温度的变化规律。结果表明：NM400钢板硬度、耐磨能力随回火温度升高而降低，在400～450 ℃由于合金元素析出的强化作用，下降较平稳；淬火态组织为马氏体，450 ℃以下回火后转变成回火马氏体，随回火温度升高，相邻马氏体板条合并的现象明显，导致钢板表面硬度下降。
英文摘要：The microstructure, surface hardness and wear capacity of NM400 steel plate during tempering at 200～600 ℃ for 1 h were investigated by SEM, TEM and EDS. The results show that the hardness and wear capacity decrease with the increase of tempering temperature, and are stable during tempering in the range of 400～450 ℃ due to the precipitation strengthening effect of alloying elements; the microstructure of the quenched plate is quenched martensite and is transformed in to tempered martensite after tempering below 450 ℃, more adjacent M lath merges at high tempering temperature, resulting in surface hardness of the steel decreasing.