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首页> 外文期刊>ISIJ international >Microstructural Changes in Low-carbon Steel Occurring by Heating in Mixtures of Iron, Graphite and Alumina Powders
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Microstructural Changes in Low-carbon Steel Occurring by Heating in Mixtures of Iron, Graphite and Alumina Powders

机译：铁，石墨和氧化铝粉末混合物中加热引起的低碳钢的显微组织变化

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摘要

Carbon and nitrogen are easily diffused into stainless steel and titanium, when these are embedded in mixtures of iron, graphite and alumina powders and held at high temperatures in a nitrogen flow. To promote an understanding of this new diffusion technique, which we call "iron-powder pack treatment", we focused attention on the microstructures of low-carbon steel subjected to such a treatment. The diffusion of carbon into the steel was understood by evaluating area fraction of pearlite emerging in ferrite. A pearl-ite area in the steel, which was heat-treated at 1 273 K for 3.6 ks using a mixture of iron and alumina powders, was larger than before heating, because the steel was carburized by carbon in the iron powder. On the other hand, an increase in the pearlite area was hardly observed in the case of a mixture of graphite and alumina powders. By replacing a part of graphite in this mixture with the iron powder, however, pearlite was most remarkably produced in the steel. Instead of the iron powder, the use of nickel powder did not exert a significant impact on the diffusion of carbon into the steel. These indicate that the iron powder acts as an important agent for enhancing the migration of carbon from a powder mixture to low-carbon steel. The relationship between a diffusion phenomenon of carbon and the generation of carbon monoxide gas in heat treatment is also discussed.
机译：当将碳和氮嵌入铁，石墨和氧化铝粉末的混合物中并在氮气流中保持高温时，碳和氮容易扩散到不锈钢和钛中。为了增进对这种新的扩散技术（我们称为“铁粉包装处理”）的理解，我们将注意力集中在经过这种处理的低碳钢的微观结构上。通过评估在铁素体中出现的珠光体的面积分数，可以了解碳在钢中的扩散。使用铁和氧化铝粉末的混合物在1 273 K下热处理3.6 ks的钢中珠光体面积比加热前大，因为钢被铁粉中的碳渗碳。另一方面，在石墨和氧化铝粉末的混合物的情况下，几乎没有观察到珠光体面积的增加。然而，通过用铁粉代替该混合物中的一部分石墨，在钢中最显着地产生了珠光体。代替铁粉，使用镍粉不会对碳向钢中的扩散产生重大影响。这些表明铁粉是增强碳从粉末混合物向低碳钢迁移的重要试剂。还讨论了碳的扩散现象与热处理中一氧化碳气体的产生之间的关系。

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  • 来源
    《ISIJ international》 |2018年第11期|2110-2116|共7页
  • 作者

    Yasuhiro MORIZONO; Sadahiro TSUREKAWA; Takateru YAMAMURO;

  • 作者单位

    Department of Materials System Engineering, National Institute of Technology, Kurume College, 1-1-1 Komorino, Kurume,Fukuoka, 830-8555 Japan;

    Division of Materials Science, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555 Japan;

    Technical Division, Faculty of Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555 Japan;

  • 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

    low-carbon steel; iron powder; graphite; alumina; nitrogen; carbon diffusion;

    机译：低碳钢铁粉石墨;氧化铝氮;碳扩散;

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