Unformatted text preview: 3 . How far into the sheet from this high-pressure side will the concentration be 2.0 kg/m 3 ? Assume a linear concentration profile. b) By what mechanism will the nitrogen diffuse? Why? 4) Callister 6.6 Determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron–carbon alloy that initially contains 0.10 wt% C. The surface concentration is to be maintained at 0.90 wt% C, and the treatment is to be conducted at 1100°C. Use the diffusion data for γ-Fe in Table 6.2. 5) Callister 6.12 The diffusion coefficients for carbon in nickel are given at two temperatures: T (°C) D (m 2 /s) 600 5.5 × 10 –14 700 3.9 × 10 –13 (a) Determine the values of D and Q d . (b) What is the magnitude of D at 850°C?...
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- Spring '12
- Thermodynamics, non-steady state diffusion, vacancy diffusion mechanism