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上: 拋光狀態. Above, as_polished. below 下: 4% Nital. 彩色部位為波來鉄. Colored area is pearlite. D-type graphite is obtained by too much undercooling. 鉄水受冷激時生D-type石墨 強度會不足.
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上: 拋光狀態. Above, as_polished. below 下: 4% Nital. 彩色部位為波來鉄. Colored area is pearlite. D-type graphite is obtained by too much undercooling. 鉄水受冷激時生D-type石墨 強度會不足.
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