$($e$)$ Using the isothermal transformation diagram for a $1\mathrm{.}13wt\%C$ steel alloy $($Figure Q$5),$ determine the final microstructure of a small specimen that has been subjected to the following time$-$temperature treatments. In each case assume that the specimen begins at $900C$ and that it has been held at this temperature for $30$ minutes.

$($i$)$ Rapidly cool to $220C,$ hold for $1000$ s $,$ then quench to room temperature.

$(2$ marks$)$

$($ii$)$ Rapidly cool to $750C,$ hold for $100$ s $,$ then quench to room temperature.

$(2$ marks$)$

$($iii$)$ Rapidly cool to $400C,$ hold for $1000$ s $,$ then quench to room temperature.

$(2$ marks$)$

please answer the questions and give explainations to what $($A$+$C$)($A$+$P$)($A $+$B$)$ and M in the figure

Cont'd