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上: 鑄件心部, 合金濃度較高而生白口, 稱"逆白口"(紅色箭頭). 下:表面合金濃度較低, 故波來鉄(黑色面積)數量較少. Above: center of casting where concentration of alloying elements is high, therefore "inverse chill" is found(red arrows). Below: Area beneath surface of the casting where concentration of alloying elements is lower, resulting in fewer pearlite (dark area).
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