Metallurgical Engineering > GATE 2026 > Diffusion
During carburizing of a steel, the surface concentration is kept constant at 1.4 wt.% carbon. Diffusivity of carbon for the steel at 950 °C is 6.25 × 10-11 m2/s. At 950 °C, the time required to carburize the steel with an initial composition of 0.2 wt.% carbon to 0.8859 wt.% carbon at a depth of 0.2 mm is ______________ seconds (approximate to the nearest integer).
Use the nearest value of the error function from the table given below for your calculation.
Use the nearest value of the error function from the table given below for your calculation.
| z | erf(z) |
|---|---|
| 0.3 | 0.3268 |
| 0.4 | 0.4284 |
| 0.5 | 0.5205 |
Correct : 1000
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