LM of spheroidal cast iron

LM of spheroidal cast iron

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Credit: ASTRID & HANNS-FRIEDER MICHLER/SCIENCE PHOTO LIBRARY

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 makes the carbon (as graphite) form small nodules (dark spots). They are surrounded by smooth envelopes of ferrite (body- centred cubic crystalline iron). These envelopes are held in a matrix of grainy pearlite spheres (iron carbide). Interference contrast illumination. Magnification x30 at 35mm size.

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

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