Cast iron

Cast iron

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Caption: Light micrograph of spheroidal cast iron in thin section. Cast iron (or pig iron) is iron containing 2.5% to 4% carbon. The addition of 0.05% magnesium causes the carbon, as graphite, to form small spheres (dark spots). They are surrounded by smooth envelopes of ferrite (body- centred cubic crystalline iron), seen here as orange. These envelopes are held in a matrix of grainy pearlite (iron carbide spheres), shown here as yellow/brown. Interference contrast illumination. Magnification x30 at 35mm , x60 at 6x7cm size.

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Keywords: cast, cast iron, cementite, chemical, chemistry, compound, compounds, ferrite, iron, light micrograph, lm, metal, orange, pearlite, spheroidal

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