Interrelationship between Grain Size and Hardness Distributions during Grain Growth in Iron

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  • Takayama Yoshimasa
    Department of Mechanical Systems Engineering, Faculty of Engineering, Utsunomiya University
  • Tozawa Tatsumi
    Department of Mechanical Systems Engineering, Faculty of Engineering, Utsunomiya University
  • Kato Hajime
    Department of Mechanical Systems Engineering, Faculty of Engineering, Utsunomiya University
  • Katsumata Chihiro
    Graduate Student, Utsunomiya University
  • Furushiro Norio
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
  • Hori Shigenori
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University

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Other Title
  • 鉄の粒成長過程における結晶粒度分布と硬さ分布の相関性
  • テツ ノ リュウ セイチョウ カテイ ニ オケル ケッショウ リュウド ブンプ

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The interrelationship between grain size and hardness distributions during grain growth has been investigated for a pure iron. It was shown that the geometric mean grain diameter Dg increased during grain growth, while the standard deviation for lnD, lnσg decreased, where the grain diameter D was defined as the equivalent volume diameter. The (arithmetic) mean Vickers hardness \barHV decreased during recrystallization and growth, showing a common sigmoidal curve in the plots of \barHV versus annealing time, and the variation coefficient of hardness σH<SUB>V</SUB>⁄\barHV expressing the spread of the distribution also tended to decrease. The mean hardness \barHV had a better correlation with Dg−1⁄2 than with \barl−1⁄2, where \barl was the arithmetic mean length of linear intercept. Therefore, it is concluded that Dg, which is one of the mean grain sizes in three dimensions, is a more significant value of the mean grain size than \barl. It was also pointed out that the value of σH<SUB>V</SUB>⁄\barHV has a trend to increase with the increment of lnσg.

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