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Effects of modification on microstructure and properties of ultrahigh carbon (1.9wt.%C) steel

机译：变质对1.9 %% C超高碳钢组织和性能的影响

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摘要

The effects of a modifier that contains Rare Earths (RE), low melting point alloy (Al-Bi-Sb) and Ca-Si alloy on an ultrahigh carbon steel containing 1.9wt.% C were studied. Microstructure characterization was carried out with optical microscopy (OM) and scanning electronic microscopy (SEM) combined with energy-dispersive spectrometry (EDS). Upon modification, the continuous eutectic carbide network structure was broken up and changed to a partly isolated and finer blocky structure in the as-cast alloy. Differential scanning calorimetry (DSC) revealed that the eutectoid temperature increased and the eutectic temperature decreased for the modified alloy. Modification also improved the impact toughness of the tempered steel, with a significant increase from 6.5 to 12.6 J cm~(-2), despite the hardness remaining around 66 HRC. Furthermore, in pure sliding under loads of 20,60 and 100 N for 600 s against a zirconia ball, the modified alloy shows slightly higher friction coefficient at all loads than the non-modified one. In addition, the friction coefficient for the steel specimen decreased with load from 20 N to 100 N attributing to a reduction in metallic wear and the formation of a thicker oxide film on the surfaces.
机译：研究了包含稀土（RE），低熔点合金（Al-Bi-Sb）和Ca-Si合金的改性剂对含1.9wt。％C的超高碳钢的影响。用光学显微镜（OM）和扫描电子显微镜（SEM）结合能量色散光谱（EDS）进行微观结构表征。改性后，连续的共晶碳化物网络结构被分解，并变成铸态合金中的部分隔离且更细的块状结构。差示扫描量热法（DSC）显示，改性合金的共析温度升高而共晶温度降低。改性还改善了回火钢的冲击韧性，尽管硬度保持在66 HRC左右，但仍从6.5 J cm〜（-2）显着增加。此外，在20,60和100 N的负载下，纯氧化锆球在600 s内进行纯滑动时，改性合金在所有负载下的摩擦系数略高于未改性合金。另外，钢试样的摩擦系数随着载荷从20 N减小到100 N，这归因于金属磨损的减少和表面上较厚的氧化膜的形成。

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  • 来源
    《Materials Science and Engineering》 |2011年第28期|p.8263-8268|共6页
  • 作者

    K.P. Liu; X.L. Dun; J.P. Lai; H.S. Liu;

  • 作者单位

    School of Materials Science and Engineering, Central South University, Changsha, Hunan Province 410083, PR China;

    School of Materials Science and Engineering, Central South University, Changsha, Hunan Province 410083, PR China;

    School of Materials Science and Engineering, Central South University, Changsha, Hunan Province 410083, PR China;

    School of Materials Science and Engineering, Central South University, Changsha, Hunan Province 410083, PR China,Scientific Center of Phase Diagram and Material Design, Central South University, Changsha, Hunan Province 410083, PR China;

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  • 正文语种 eng
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  • 关键词

    microanalysis; steel; grain refinement; phase transformation; wear;

    机译：微量分析钢;晶粒细化相变穿;

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