| 高强度低合金耐磨钢NM400的强韧化机制 |
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| 引用本文： | 刘伟建,李晶,霍向东.高强度低合金耐磨钢NM400的强韧化机制[J].钢铁研究学报,2014,26(7):77-81. |
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| 作者姓名： | 刘伟建 李晶 霍向东 |
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| 作者单位： | 1. 北京科技大学冶金与生态工程学院钢铁冶金新技术国家重点实验室, 北京 100083 2. 江苏大学材料与科学工程学院, 江苏 镇江 212013 |
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| 摘 要： | 采用控轧控冷工艺生产的高强度低合金耐磨钢NM400,具有高强度、高硬度和较高的韧性,其屈服强度为1 170MPa,抗拉强度为1 369MPa,平均硬度为403HB,伸长率为23%,-20℃冲击功为47J。光学显微镜观察发现,NM400的组织为回火马氏体,淬透性良好;透射电镜下观察发现,钢中存在大量纳米尺寸级析出物,能谱分析表明,析出物为Ti,Nb的碳氮化物。分析结果表明,耐磨钢NM400的强化机制主要为位错强化、细晶强化和析出强化;细晶强化是韧性提高的主要原因。
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| 关 键 词： | 耐磨钢 控轧控冷 晶粒细化 析出强化 位错强化 |
Mechanism of Strengthening and Toughening for Wear Resistant Steel NM400 With High Strength and Low Alloy |
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| LIU Wei-jian,LI Jing,HUO Xiang-dong.Mechanism of Strengthening and Toughening for Wear Resistant Steel NM400 With High Strength and Low Alloy[J].Journal of Iron and Steel Research,2014,26(7):77-81. |
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| Authors: | LIU Wei-jian LI Jing HUO Xiang-dong |
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| Affiliation: | 1. State Key Laboratory of Advanced Metallurgy, School of Metallurgy and Ecologic Engineering, University of Science and Technology Beijing, Beijing 100083, China ;2. School of Material Science and Engineering,Jiangsu University, Zhenjiang 212013, Jiangsu, China |
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| Abstract: | Wear resistant steel NM400 with high strength and low alloy produced by controlled rolling and cooling process has high strength, high hardness and high toughness. The yield strength is 1170MPa, the tensile strength is 1369MPa, the average hardness is 403HB, the elongation is 23% and the impact energy at -20℃ is 47J. The microstructure is tempered martensite. There are a large number of nano-size carbonitrides of Ti and Nb in the steel. The analysis shows that wear-resistant steel NM400 is strengthened by dislocation strengthening, grain refinement strengthening and precipitation hardening. The toughness is increased by grain refinement. |
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| Keywords: | wear resistant steel controlled rolling and cooling grain refinement precipitation strengthening dislocation strengthening |
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