Nitrogen from a gaseous phase is to be diffused into pure iron at 700°C. If the surface concentration is maintained at 0.13 wt% N, what will be the concentration (in weight percent) 3.8 mm from the surface after 6.4 h? The diffusion coefficient for nitrogen in iron at 700°C is 4.1 x 10-10 m²/s.
Nitrogen from a gaseous phase is to be diffused into pure iron at 700°C. If the surface concentration is maintained at 0.13 wt% N, what will be the concentration (in weight percent) 3.8 mm from the surface after 6.4 h? The diffusion coefficient for nitrogen in iron at 700°C is 4.1 x 10-10 m²/s. Z 0.00 0.10 0.15 erf(z) 0.025 0.0282 0.60 0.6039 0.05 0.0564 0.65 0.6420 0.40 0.0000 0.55 0.5633 0.1125 0.30 0.3286 0.45 Z erf(z) 0.70 0.6778 0.4755 0.1680 0.75 0.7112 0.20 0.2227 0.80 0.7421 1.8 0.25 0.2763 0.85 0.7707 1.9 0.4284 1.0 Z 1.1 1.3 0.9340 1.4 0.35 0.3794 0.95 0.8209 2.2 0.8427 1.5 1.6 0.90 0.7970 2.0 1.7. erf(z) 2.4 0.9523 0.9661 0.9763 0.9838 0.9891 0.9928 0.9953 0.9981 0.9993 0.8802 2.6 0.9998
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