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Microstructures and high temperature properties of spray formed niobium-containing M3 high speed steel

机译：喷射成形含铌M3高速钢的组织和高温性能

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摘要

The billets of M3 high speed steel (HSS) with or without niobium addition were prepared via spray forming and forging, and the corresponding microstructures, properties were characterized and analysed. Finer and uniformly-distributed grains without macrosegregation appear in the as-deposited high speed steel that are different to the as-cast high speed steel, and the primary austenite grain size can be decreased with 2% niobium addition. Niobium appears in primary MC-type carbides to form Nb_6C_5 in MN2 high speed steel, whereas it contributes less to the creation of eutec-tic M_6C-type carbides. With same treatments to forged MN2 high speed steel and M3 high speed steel, it is found that the peak hardness of these two steels are almost the same, but the temper-softening resistance of the former is better. With higher high-temperature hardness of the forged MN2 high speed steel, its temper softening above 600℃ tends to slow down, which is related to the precipitation of the secondary carbides after tempering. A satisfactory solid solubility of Vanadium and Molybdenum can be obtained by Nb substitution, precipitation strengthening induced by larger numbers of nano-scaled MC and M_2C secondary carbides accounts for the primary role of determining higher hardness of MN2 high speed steel. The results of the wear tests show that the abrasive and adhesive wear resistance of MN2 high speed steel can be improved by the grain refinement, existence of harder niobium-containing MC carbides, as well as solute strengthening by more solute atoms. The oxidational wear behavior of MN2 high speed steel can be markedly influenced by the presence of the high hardness and stabilization of primary niobium-containing MC-type carbides embedded in the matrix tested at 500℃ or increased loads. The primary MC carbides with much finer sizes and uniform distribution induced by the combined effects of niobium addition and atomization/deposition would be greatly responsible for the good friction performance of the forged MN2 high speed steel.
机译：通过喷射成形和锻造，制备了添加或不添加铌的M3高速钢（HSS）钢坯，并对相应的组织，性能进行了表征和分析。沉积后的高速钢中出现的细晶粒均匀分布而没有宏观偏析，这与铸造后的高速钢不同，添加2％的铌可以减小一次奥氏体晶粒尺寸。铌出现在MN2高速钢中的初级MC型碳化物中，形成Nb_6C_5，而铌对共晶M_6C型碳化物的贡献较小。在对锻造的MN2高速钢和M3高速钢进行相同的处理后，发现这两种钢的峰值硬度几乎相同，但前者的抗回火软化性更好。锻造的MN2高速钢具有较高的高温硬度，其600℃以上的回火软化趋于减缓，这与回火后二次碳化物的析出有关。钒和钼的固溶度可通过Nb替代获得，大量纳米级MC和M_2C二次碳化物引起的析出强化是确定MN2高速钢较高硬度的主要作用。磨损测试的结果表明，通过晶粒细化，存在更硬的含铌MC碳化物以及通过更多的溶质原子进行溶质强化，可以改善MN2高速钢的耐磨性和粘附性。 MN2高速钢的氧化磨损行为可能会受到高硬度的影响，并且在500℃或更高的负载下嵌入基体中时，都会嵌入嵌入基体中的含铌MC型初级碳化物，从而提高其稳定性。由铌添加和雾化/沉积的综合作用所引起的，具有更细小尺寸和均匀分布的初级MC碳化物将极大地有助于锻造MN2高速钢的良好摩擦性能。

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  • 来源
    《Materialwissenschaft und Werkstofftechnik》 |2014年第8期|689-698|共10页
  • 作者

    H. B. Wang; L. G. Hou; J. X. Zhang; L. Lu; H. Cui; J. F. Huang; J. S. Zhang;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30,100083 Beijing, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30,100083 Beijing, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30,100083 Beijing, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30,100083 Beijing, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30,100083 Beijing, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30,100083 Beijing, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30,100083 Beijing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    spray forming; M3 high speed steel; niobium; microstructure;

    机译：喷射成型M3高速钢;铌;微观结构;

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