The ttt diagram for a given grade of steel is shown


The TTT diagram for a given grade of steel is shown below.

a. If the temperature is suddenly reduced from 800 °C to 550 °C, how much time will it take to complete transformation into 50% pearlite and 50% austenite?

b. If the alloy is quenched from 800 °C to ambient temperature in less than 1 sec, will it reach peak hardness? there is a graph

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