Using the given T$-$T$-$T diagram indicate micro$-$constituents present in each:

The steel is rapidly cooled or quenched from $750C$ to $580C,$ and then held for $60$ sec $,$ and slowly cooled to room temperature.

Cooled to $500C,$ held for $3$ s $,$ and rapidly cooled to room temperature.

Cooled to $400C,$ held for $50$ s $,$ and then rapidly cooled to room temperature.

Cooled to $650C,$ held for $9$ s $,$ rapidly cooled to $250C,$ then heated to $450C,$ held for $2$ minutes and cooled.

Cooled to $250C,$ held for $12$ hours, and then cooled to room temperature.

Quenched to room temperature in water, and then reheated to $425C$ for $20$ s $,$ and then cooled to room temperature.