ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Effect of Magnifications of Images on Automatically Measured Grain Size
Kunio Ito
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1990 Volume 30 Issue 7 Pages 490-495

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Abstract

Grain size numbers of micrographs of ferritic steels measured by commercial automated image analyzers as well as by a newly developed program for personal computer were examined as a function of number of grains counted in a processing field. The dispersion of results due to differences in the commercial equipments has been found to be minimized when about 100 grains are taken into the field of 400×400 pixels. Comparison of values obtained by the new program with those measured manually has lead to the conclusion that the number of grains in the field of 400×400 pixels should be limited to not less than 100 but not more than 300 in order to find a good agreement between the two procedures.

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© The Iron and Steel Institute of Japan
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