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Problem $5$: The Martensite Reaction and Tempering

Figure $13-7.$ The TTT diagram for $1050$ steel

Figure $12-35.$ The iron$-$carbon phase diagram, up to the stoichiometric intermetallic Fe$\_(3)$C $(6\mathrm{.}67$wt$.\%$C $)$

A steel containing $0\mathrm{.}3\%$C is heated to various temperatures above the eutectoid temperature, held for $1$

h$,$ and then quenched to room temperature.

Using Figure $12-35,$ determine the amount, composition, and hardness of any martensite that forms

when the heating temperature is