11.14), specify the na- nure of the final microstructure (in terms of microconstituents 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°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature. (b) Reheat the specimen in part a to 700°C (1290°F) for 20 h. (c) Rapidly cool to 600°C (1110°F), hold for 4 s, rapidly cool to 450°C (840°F), hold for 10 s, then quench to room temperature.
11.14), specify the na- nure of the final microstructure (in terms of microconstituents 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°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure.
(a) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature.
(b) Reheat the specimen in part a to 700°C (1290°F) for 20 h.
(c) Rapidly cool to 600°C (1110°F), hold for 4 s, rapidly cool to 450°C (840°F), hold for 10 s, then quench to room temperature.
(d) Cool rapidly to 400°C (750°F), hold for 2 s, then quench to room temperature.
(e) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature.
(f) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature. Rapidly cool to 575°C (1065°F), hold for 20 s, rapidly cool to 350°C (660°F), hold for 100 s, then quench to room temperature.
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