平均結晶粒度評価における結晶粒度分布の影響

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  • Influence of Grain Size Distribution on Estimation of Mean Grain Size
  • ヘイキン ケッショウ リュウド ヒョウカ ニ オケル ケッショウ リュウド ブ

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The influence of grain size distribution on the estimation of mean grain size has been investigated. A calculation of the mean grain size by the intercept (Heyn’s) or the planimetric (Jeffries’) method was carried out for a grain structure model. In the model, the grain shape and the grain diameter (equivalent volume diameter) D were reasonably set to be the tetrakai-decahedron and to have a log-normal distribution, respectively.<BR>As the result of the calculation, the following equations are derived for the intercept and the planimetric methods;<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentwhere Dg is the geometric mean grain diameter and σg is the geometric standard deviation for D. The calculated value by the intercept method, lcal was in good agreement with the experimental value, \barlex. The mean grain sizes obtained experimentally revealed its clear dependence on σg, which corresponded well to that of the calculated sizes. These suggested that the grain size distribution should have a significant effect on the estimation of the mean grain size.

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  • 日本金属学会誌

    日本金属学会誌 52 (9), 835-842, 1988

    公益社団法人 日本金属学会

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