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Posted: **Sat Feb 19, 2022 3:34 pm**

: What Temperature Is Required To Obtain 0 60 C At A Distance Of 0 5 Mm Beneath The Surface Of A 0 18 C Steel In 2 Hours 1 (34.2 KiB) Viewed 130 times

: What Temperature Is Required To Obtain 0 60 C At A Distance Of 0 5 Mm Beneath The Surface Of A 0 18 C Steel In 2 Hours 2 (26.61 KiB) Viewed 130 times

What temperature is required to obtain 0.60% C at a distance of 0.5 mm beneath the surface of a 0.18% C steel in 2 hours, when 1.2% C is present at the surface? Given: CX Со х = 1- erf 2Dt = Cs Со where: D = Doexp(-RT Q Where: R = 8.31 J/mol K Do = 0.00005 m/s Q = 284 kJ/mol
Z 0 0.10 0.20 0.30 0.40 0.50 0.60 Error Function Values for Problem Erf(Z) Z 0 0.70 0.1125 0.80 0.2227 0.90 0.3286 1.00 0.4284 1.50 0.5205 2.00 0.6039 2.80 Erf(z) 0.6778 0.7421 0.7970 0.8427 0.9661 0.9953 0.9999