Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition in the below Figure, specify the nature of tine 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 760C(1400F ) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Cool rapidly to 650C, hold for 103s, then quench to room temperature. (b) Reheat the specimen in part (a) to 700C for 20h. (c) Rapidly cool to 580C, hold for 4s, rapidly cool to 350C, hold for 50s, then quench to room temperature. (d) Cool rapidly to 350C, hold for 2s, then quench to room temperature. (e) Cool rapidly to 500C, hold for 200s, then quench to room temperature. (f) Rapidly cool to 250C, hold for 100s, then quench to room temperature in water. F:eheat to 315C for 1h and slowly cool to room temperature