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Ab-10. Match the proper description of the microstructure depicted below. Put the corresponding letter in the box beneath the
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First diagram corresponds to B: A binary-eutectic material with a composition greater than the solid solubility limit at room temperature but less than the solid solubility limit at the surface temperature. Explanation: Here, phase \beta nucleates as \alpha solid solubility is exceeded at solvus line.

Second diagram corresponds to E: A binary-eutectic material with a eutectic composition. Explanation: The layers \alpha and \beta are eutectic layers which form this very eutectic structure after crossing eutectic isotherm.

Third diagram corresponds to F: The eutectoid composition of steel below the eutectoid temperature. Explanation: Here slow cooling forms perlite, which is a layered structure of two phases \alpha-ferrite and cementite (Fe3C).

Fourth diagram corresponds to I: A hypo-eutectoid composition of steel below the eutectoid temperature. Explanation: Here, the composition is proeutectic \alpha and perlite.

Fifth diagram corresponds to G: A hyper-eutectoid composition of steel above the eutectoid temperature, but below the solid solubility limit of carbon in austenite. Explanation: It contains proeutectic cementite and austenite.

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