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Suppose that a steel of eutectoid composition is cooled to 675?C (1250?F) from 760?C (1400?F) in less than 0.5 s and held at this temperature. (a) How long will it take for the austeniteto- pearlite...

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Suppose that a steel of eutectoid composition is cooled to 675?C (1250?F) from 760?C (1400?F) in less than 0.5 s and held at this temperature.

(a) How long will it take for the austeniteto- pearlite reaction to go to 50% completion? To 100% completion? (b) Estimate the hardness of the alloy that has completely transformed to pearlite.

Answered Same Day Dec 29, 2021

Solution

Robert answered on Dec 29 2021
109 Votes
From the following diagram a horizontal line at 550°C intersects the 0.5 and completion of reaction
curves at about 2.5 and 6 seconds.Hence the required times are 2.5 and 6 seconds.
) The pearlite formed will be fine pearlite.The hardness of an alloy of composition 0.76 wt% C that
consists...
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