(Solved): Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45wt%C steel alloy, ...

Using the Animated Figure 10.40, the isothermal transformation diagram for a $0.45\mathrm{wt}\%\mathrm{C}$ steel alloy, specify the nature of the final microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following temperature treatments. In each case assume that the specimen begins at $845^{?}\mathrm{C}$ and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. a) Rapidly cool to 400 degrees $\mathrm{C}$, hold for $500\mathrm{s}$, then quench to room temperature. b) Rapidly cool to 450 degrees $C$, hold for $10\mathrm{s}$, then quench to room temperature. eTextbook and Media