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極低碳鋼 彎折時常會破裂, 是這些 碳化物薄膜引起的. Carbide films in extremely low carbon steel often initiate cracking during bending.
晶界碳化物 用暗視野觀察最容易辨識. Grainboundary carbide observed under dark field.
上下兩照片屬同一視野. Same field: above: dark, below: bright, with Ferrite tinted.
上:肥粒鉄上色. 下: 碳化物上色 (褐色 紫色條狀物), 效果不是很好, 因為肥粒鉄也變得斑駁. above: Ferrite tinted; below: carbide tinted dark brown.
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