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Microstructural evolution and control in the directional solidification of iron-carbon-silicon alloys.

机译：铁-碳-硅合金定向凝固过程中的微观组织演变和控制。

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摘要

The main objective of this study was to examine the influence of four impurities S, Te, O, and H on structure control in the directional solidification of Fe-C-Si alloys. In the course of the solidification experiments, it was also observed that control of the solidification atmosphere by either H;The Auger analysis in Part II showed that the iron matrix/graphite interface regions were contaminated by the adsorbed elements S or O when the graphite solidified in flake morphology, type A or D, in both high purity and S-added alloys. The O presence was, however, observed only in coarse type A structure. The experiments in Part III produced evidence supporting that both the type A and D graphite grow by the extension of basal growth layers. Part IV of this study produced evidence that the interaction of the H with Te, as opposed to independent action of H, is primarily responsible for the enhancement of Te effectiveness in promoting white iron growth. The experimental results of the present study lead to the conclusion that the presence of impurity elements, either by doping addition (S and Te) or by atmosphere control (H and O), controls the structure of cast iron through the adsorption at the growth front (S and Te) or through the interaction with O (H). (Abstract shortened with permission of author.)
机译：这项研究的主要目的是研究Fe-C-Si合金定向凝固中四种杂质S，Te，O和H对组织控制的影响。在凝固实验过程中，还观察到通过H来控制凝固气氛；第二部分的俄歇分析表明，当石墨凝固时，铁基体/石墨界面区域被吸附的元素S或O污染。高纯度和添加S的合金的A型或D型薄片形态。然而，仅在粗糙的A型结构中观察到O的存在。第三部分中的实验产生的证据支持A型和D型石墨都通过基底生长层的延伸而生长。这项研究的第四部分提供了证据，表明H与Te的相互作用（与H的独立作用相反）主要负责增强Te促进白铁生长的有效性。本研究的实验结果得出的结论是，通过掺杂添加（S和Te）或通过气氛控制（H和O）存在杂质元素，通过生长前沿的吸附来控制铸铁的结构。 （S和Te）或通过与O（H）相互作用。 （摘要经作者许可缩短。）

著录项

  • 作者

    Park, Jang-Sik.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Engineering Metallurgy.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1990
  • 页码 159 p.
  • 总页数 159
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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