白色: 共晶部份: 粒滴斑鉄 暗色:初晶部份, 常溫下為 波來鉄. White area: eutectic portion, called Ledeburite, a mixture of carbide + iron. Dark area: pro-eutectic portion, called dendrites of iron. At high temp, this iron is Austenite. At room temp, this iron is Pearlite which is a mixture of very fine carbide + Ferrite.
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