Solved: Time taken by steel-to make it less brittle, Mechanical Engineering

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Time taken by steel-to make it less brittle

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Q: Steel is sequentially heated and cooled (annealed) to relieve stresses and to make it less brittle. Consider a 100-mm-thick plate (k = 45 W/m · K. p = 7800 kg/m3 · cp = 500J/kg · K) that is initially at a uniform temperature of 300°C and is heated (on both sides) in a gas-fired furnace for which T8 = 700°C and h = 500 W/m2 · K. How long will it take for a minimum temperature of 550°C to be reached in the plate?

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Mechanical Engineering: Time taken by steel-to make it less brittle

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