Grain Size Distribution during Grain Growth in Dual-Phase Brass

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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
  • 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
  • 2相黄銅の粒成長過程における結晶粒度分布
  • 2ソウ オウドウ ノ リュウ セイチョウ カテイ ニ オケル ケッショウ リュ

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Abstract

The change in the grain size distribution during grain growth has been investigated for a dual-phase brass. The two-dimensional grain size distribution, namely, that of grain intersect areas was measured. The distribution was also calculated for a sphere grain structure model. The model assumes that the grain diameter (=the equivalent volume diameter) D has a log-normal distribution; the distribution of this grain diameter is clearly defined by the geometric mean grain diameter Dg and the standard deviation of lnD, that is lnσg. The change of the grain diameter distribution was discussed qualitatively by comparing the experimental and the calculated results. The distribution is one of the expressions for the three-dimensional grain size distribution, the change of which corresponds directry to grain growth.<BR>As a result, the mean grain intersect area increased during grain growth. The grain growth exponent n was not constant but decresed remarkably. The grain intersect area distributions of the α-, the β- and the dual phases were close to a log-normal distribution. The distribution for the model was not log normal strictly, and the deviation from the log-normal depended strongly on the value of lnσg. These results suggest that the value of lnσg for the α-phase remains relatively small, while that for the β-phase decreased during a short time heating and then remained almost constant.

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