Kiriu Corporation

Kunihiro Masuo

Tetsuro Aoki

Hajime Ichimura

Masanori Imasaki

There is provided a method for quantitatively evaluating properties of a graphite structure of a gray cast iron based on a number and a thick and thin degree of graphite components in the structure. In particular, only non-spherical graphite pieces having an average size of 5 &#x3bc;m or more are extracted from a preprocessed image of the graphite structure, and counted (Step Sof FIG.). Further, only graphite pieces having a maximum length of 50 &#x3bc;m or more and less than 150 &#x3bc;m are selected therefrom, and a length and an area of each selected graphite piece are measured (Step S). An area of an assumptive representative graphite piece having a maximum length (a maximum size) of 100 &#x3bc;m is calculated from these data, and divided by the length 100 &#x3bc;m, to obtain the thick and thin degree (Step S). The thick and thin degree is shown with the number of the graphite pieces (Step S).

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Gunma, Japan

Kunihiro Masuo