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17 Nov 2019
Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, 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 (1400 degree F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. Cool rapidly to 700 degree C (1290 degree F), hold for 10^4 s, then quench to room temperature. Reheat the specimen in part (a) to 700 degree C (1290 degree F) for 20 h. Rapidly cool to 600 degree C (1110 degree F), hold for 4 s, rapidly cool to 450 degree C (840 degree F), hold for 10 s, then quench to room temperature. Cool rapidly to 400 degree C (750 degree F), hold for 2 s, then quench to room temperature.
Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, 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 (1400 degree F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. Cool rapidly to 700 degree C (1290 degree F), hold for 10^4 s, then quench to room temperature. Reheat the specimen in part (a) to 700 degree C (1290 degree F) for 20 h. Rapidly cool to 600 degree C (1110 degree F), hold for 4 s, rapidly cool to 450 degree C (840 degree F), hold for 10 s, then quench to room temperature. Cool rapidly to 400 degree C (750 degree F), hold for 2 s, then quench to room temperature.
15 Apr 2022
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