低酸素鋼の強度と降伏点現象に及ぼす結晶粒径と熱処理の影響  [in Japanese] Effects of Grain Size and Heat Treatment on Strength and Yield Point Phenomena of Low Carbon Steel  [in Japanese]

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Author(s)

    • 小野寺 龍太 ONODERA Ryuta
    • 九州大学工学部材料工学科 Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
    • 祝 桂合 HE Zhu Gui
    • 九州大学工学部材料工学科 Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
    • 森田 泉 MORITA Izumi
    • 九州大学工学部材料工学科 Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University

Abstract

We examined the effect of grain size on flow stress and yield-point phenomena in variously heat-treated low-carbon steel specimens. We found that the experimental results are easily understood if the flow stress consists of two internal stresses, <I>Yint</I> and <I>Yir</I>. <I>Yint</I> is a common internal stress that is work hardened; <I>Yir</I> is the cause of yield-point phenomena, and its value is supposed to be rapidly decreased (work-softened) to zero with strain. Both <I>Yint</I> and <I>Yir</I> were affected by grain size. Furthermore, the effect of heat treatment was strong on <I>Yint</I> but weak on <I>Yir</I>. The Hall-Petch coefficient <I>k</I> was appreciably larger at lower yield points than in the large strain region. This comparison supports the hypothesis of the existence of two internal stresses because the grain size dependence of flow stress at lower yield points has two origins, <I>Yint</I> and <I>Yir</I>, whereas the latter case has only one origin, Yint. In the strain region exceeding yield-point elongation, the stress-strain curves of specimens with various grain sizes were perfectly superposed on each other by parallel translation, which means that if <I>Yint</I> is expressed as <I>Yint</I>(ε)=f(ε) for a specimen with a certain grain size, it is expressed as <I>Yint</I>(ε)=f(ε+<I>Δ</I>ε)−<I>Δ</I>σ for arbitrary grain size specimens, where <I>Δ</I>ε and <I>Δ</I>σ are the amounts of translation in strain and stress, respectively.

Journal

  • Journal of the Japan Institute of Metals and Materials

    Journal of the Japan Institute of Metals and Materials 66(5), 521-527, 2002-05-20

    The Japan Institute of Metals and Materials

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  • Characteristics of Luders Deformation and Their Computer Simulation Based on a Work-softening Model  [in Japanese]

    ONODERA Ryuta , MORITA Izumi , KAMIKIHARA Ryuta , ARAMAKI Masatoshi

    Tetsu-to-Hagane 87(11), 719-726, 2001-11-01

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Codes

  • NII Article ID (NAID)
    10008833211
  • NII NACSIS-CAT ID (NCID)
    AN00062446
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    00214876
  • NDL Article ID
    6179178
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-314
  • Data Source
    CJP  NDL  J-STAGE 
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