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首页> 外文期刊>ISIJ international >Effect of Grain Size on the Yield Stress of Cold Worked Iron
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Effect of Grain Size on the Yield Stress of Cold Worked Iron

机译：晶粒度对冷作铁屈服应力的影响

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摘要

Effect of ferrite grain size on dislocation strengthening was investigated in low carbon steels (0.006%C-0.15%C) with various grain sizes from 1 to 100 μm. In specimens with slight deformation, dislocation density increases in proportion to the inverse of ferrite grain size. In the dislocation density range below 2×10~(14)/m~2, dislocation density increases linearly against deformation strain but it tends to level off due to the dynamic recovery of dislocations when dislocation density has exceeded it. On the other hand, tensile tests revealed that yield stress follows the Hall-Petch relation for as-annealed specimens but follows the Bailey-Hirsch relation for cold rolled specimens. This means that flow stress depends on only the dislocation density regardless of grain size. As a result, it was concluded that the introduction of dislocations has been promoted with decreasing ferrite grain size and this results in the increase of flow stress in the uniform deformation region.
机译：研究了铁素体晶粒尺寸对位错强度为1至100μm的低碳钢（0.006％C-0.15％C）中位错强化的影响。在轻微变形的试样中，位错密度与铁素体晶粒尺寸的倒数成正比。在位错密度低于2×10〜（14）/ m〜2的范围内，位错密度随形变应变线性增加，但当位错密度超过位错密度时，由于位错的动态恢复而趋于平稳。另一方面，拉伸试验表明，退火后的试样的屈服应力遵循霍尔-Petch关系，而冷轧试样的屈服应力遵循Bailey-Hirsch关系。这意味着流动应力仅取决于位错密度，而与晶粒尺寸无关。结果，可以得出结论，随着铁素体晶粒尺寸的减小，位错的引入得到了促进，这导致了均匀变形区域中流动应力的增加。

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  • 来源
    《ISIJ international》 |2018年第10期|1927-1933|共7页
  • 作者

  • 作者单位

    Faculty of Engineering Technical Division Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Research Center for Steel Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Research Center for Steel Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Department of Materials Science and Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 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
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  • 关键词

    low carbon steel; ferrite grain size; Hall-Petch relation; Bailey-Hirsch relation; dislocation den-sity; strengthening mechanism;

    机译：低碳钢铁素体晶粒度Hall-Petch关系;Bailey-Hirsch关系;位错密度强化机制;

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