Light micrograph of cast iron

Light micrograph of cast iron

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Credit: MIKE MCNAMEE/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of cast iron. Steel & cast iron are made by adding small amounts of carbon to iron. When the carbon level is greater than 4%, discrete flakes or particles of carbon are formed & the steel is classed as cast iron. This specimen is a "spheroidal cast iron" which, as a result of adding 0.04-0.06% magnesium, contains its excess carbon as graphite spheres (blue). The spheres make this cast iron relatively ductile. The smooth red background is ferrite; the grainy red area at right is pearlite containing tiny spheres of cementite. (Polished section, Nital etch, ferric oxide coating). Magnification: x200 at 35mm size, x440 at 6x9cm size. Ref: MICROCOSMOS, fig. 7.36, page 143

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Keywords: alloy, cast iron, chemical, chemistry, compound, compounds, ferrite, graphite, pearlite, spheroidal, spheroidal cast iron

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