Engineering, 07.04.2020 20:37, smiley29162

Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in an air environment for which T? = 325 K and h = 20 W/m2/K. Assuming the properties of the steel to be k = 40 W/m2K, ? = 7800 kg/m3, and c = 600 J/kg/K, estimate the time required for the cooling process.

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Steel balls 12 mm in diameter are annealed by heating to 1150 K and then slowly cooling to 400 K in...