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Effect of Ultra-high Magnesium on SKS51 Liquid Steel Cleanliness and Microstructure

机译：超高镁对SKS51钢水清洁度和组织的影响

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摘要

This study emphasizes that ultra-high Mg ([%Mg]>0.03) content is very difficult to be achieved under conventional smelting conditions. The content of Mg in steel has significant influence on the cleanness of molten steel and microstructure. As the content of Mg increases, the content of O and S in steel decreases significantly, with 0 content as low as 0.0002% and S content as low as 0.0008%. Almost all inclusions in ultra-high Mg steel are magnesium-bearing oxide, sulfide, even carbide. As the content of Mg increases, the number of inclusions in the steel increases and the size decreases. But if too much Mg is added into the steel, the size and number of inclusions will rapid increase. The as-cast secondary dendrite spacing of steel decreased obviously with the increase of Mg content in steel. As the content of Mg increases, the as-cast microstructure changes from lamellar pearlite to granular pearlite. The phase diagram of SKS51 steel was calculated by Thermal-calc software. The calculated results showed that MgC_2 was precipitated in the austenite before the austenite was converted into perlite. MgC_2 may become the nuclear core, leading to perlite transformation. Suspected MgC_2 was found in spheroidized annealing Fe_3C core.
机译：这项研究强调，在常规冶炼条件下很难达到超高的Mg（[％Mg]> 0.03）含量。钢中镁的含量对钢水的清洁度和组织有重要影响。随着Mg含量的增加，钢中O和S的含量显着下降，0含量低至0.0002％，S含量低至0.0008％。超高镁钢中几乎所有的夹杂物都是含镁的氧化物，硫化物，甚至是碳化物。随着Mg含量的增加，钢中夹杂物的数量增加并且尺寸减小。但是，如果将过多的镁添加到钢中，夹杂物的大小和数量将迅速增加。随着Mg含量的增加，铸态二次枝晶间距明显减小。随着Mg含量的增加，铸态组织从层状珠光体变为粒状珠光体。用Thermal-calc软件计算出SKS51钢的相图。计算结果表明，在奥氏体转变成珍珠岩之前，MgC_2沉淀在奥氏体中。 MgC_2可能成为核核心，导致珍珠岩转化。在球形退火Fe_3C核中发现了疑似MgC_2。

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  • 来源
    《ISIJ international》 |2019年第7期|1234-1241|共8页
  • 作者

    Zhouhua JIANG; Guang XU; Yang LI; Huabing LI; Jianbo LV; Qi WANG;

  • 作者单位

    School of Metallurgy, Northeastern University, Shenyang Liaoning, 110819 China;

    School of Metallurgy, Northeastern University, Shenyang Liaoning, 110819 China;

    School of Metallurgy, Northeastern University, Shenyang Liaoning, 110819 China;

    School of Metallurgy, Northeastern University, Shenyang Liaoning, 110819 China;

    School of Metallurgy, Northeastern University, Shenyang Liaoning, 110819 China;

    School of Metallurgy, Northeastern University, Shenyang Liaoning, 110819 China;

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

    ultra-high magnesium; cleanness of molten steel; secondary dendrite; MgC_2; perlite;

    机译：超高镁钢水清洁度;次生枝晶MgC_2;珍珠岩;

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