Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at a position 1.5 mm into

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Determine The Carburizing Time In S Necessary To Achieve A Carbon Concentration Of 0 44 Wt At A Position 1 5 Mm Into 1 (149.95 KiB) Viewed 17 times

Determine the carburizing time (in s) necessary to achieve a carbon concentration of 0.44 wt% at a position 1.5 mm into an iron- carbon alloy that initially contains 0.031 wt% C. The surface concentration is to be maintained at 1.2 wt% C, and the treatment is to be conducted at 1090°C. Assume that Do = 5.1 x 105 m²/s and Qd =154 kJ/mol. You will find the table below useful. i S Z 0 0.025 0.10 0.20 0.25 0.30 erf(z) 0.05 0.0564 0.65 0.35 0 0.40 0.0282 Z 0.55 0.5633 1.3 0.60 erf(z) Z 0.15 0.1680 0.75 0.7112 1.7 0.9838 0.2227 0.80 0.6039 1.4 erf(z) 0.50 0.5205 0.9340 0.1125 0.70 0.6778 1.6 0.9763 0.9523 0.6420 1.5 0.9661 0.3286 0.90 0.7970 2.0 0.7421 1.8 0.9891 0.2763 0.85 0.7707 1.9 0.9928 0.9953 0.3794 0.95 0.8209 2.2 0.9981 0.4284 1.0 0.8427 2.4 0.9993 0.45 0.4755 1.1 0.8802 2.6 0.9998 1.2 0.9103 2.8 0.9999