Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the heat treatments procedure that results the final microstructure 1- 100% Martensite
2- 50% Pearlite +50% Martensite
3- 50% Martensite + 50% Bainite
4- 50% Bainite + 50% Coarse Pearlite
5- 50% Martensite+ 25% Bainite + 25% Fine Pearlite

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2