For a $0\mathrm{.}61wt\%C$ steel plate, show any calculations to support your responses to the following queries:

A$.$ After pouring the melt into a refractory container and allowed to furnace cool to $728C,$ calculate the fractionalyamounts of the equilibrated phases formed within a plate.

B$.$ For a steel with the attached time$-$temperature$-$transformation $($TTT$)$ diagram, give the processing of three steel items $-$ one plate with a microstructure of $25\%$ pearlite, another plate of $100\%$ martensite minimized for cracking, and the third plate with $75\%$ lower bainite.

C$.$ For $2$ B and $2$ C $,$ sketch carefully each microstructure expected for the four plates with all the phases identified with their corresponding temperatures.