Carbon steel

Carbon steel

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Credit: MIKE MCNAMEE/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a 0. 4 percent carbon steel. Different types of steel are made by the addition of small amounts of carbon to iron under various regimes of heat & cooling. This specimen has a mixed microstructure consisting of separate areas of pearlite & ferrite (pure iron). The yellow triangular feature is a ferrite grain boundary which at an earlier stage of heat-treatment was austenite, & which has been "frozen" into the microstructure during the rapid cooling. It has a sawtooth structure. The pearlite is the mixture of green & blue areas. (Nomarski illumination, polished section, Nital etch. ) Magnification: x25 at 35mm size, x45 at 6x9cm size. Ref: MICROCOSMOS, fig. 7.34, page 142

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Keywords: %, 0.4 percent, alloy, chemical, chemistry, compound, compounds, ferrite, iron carbide, light micrograph, pearlite, pearlitic steel, steel

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