Using the TTT diagram for an iron-carbon alloy of eutectoid compositi.pdf

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The document describes an iron-carbon alloy of eutectoid composition that begins at 760 degrees C to achieve a homogeneous austenitic structure. It then undergoes various time-temperature treatments. For slow cooling, the final microstructure consists of coarse pearlite and ferrite, with ~85% pearlite and ~15% ferrite. For very fast cooling, the final microstructure consists of martensite and retained austenite, with ~95% martensite and ~5% retained austenite.

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Using the TTT diagram for an iron-carbon alloy of eutectoid composition as shown in the figure
below, specify the nature of the final microstructure (in terms of micro constituents present and
approximate percentages of each) of a small specimen that has been subjected to the following
time temperature treatments. In each case assume that the specimen begins at 760 degree C and
that it has been held at this temperature long enough to have achieved a complete and
homogeneous austenitic structure. If pearlite forms, please specify whether it is coarse or fine
pearlite
Solution
For coarse grain size,
Case 4th and for fine grain size case 4th 1st

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