Using the isothermal transformation diagram for an eutectoid alloy, specify the nature of the final microstructure of a specimen that has been subjected to the following treatments. in each case assume that the specimen begins at 760° c and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. rapidly cool to 350° c, hold for 104 s, and quench to room temperature. rapidly cool to 250° c, hold for 102 s, and quench to room temperature. rapidly cool to 650° c, hold for 20 s, rapidly cool to 400° c and hold for 103 s, and quench to room temperature. show all formulas and steps on ttt and explain.