GATE MT · 2026 · MT
Question 60: Diffusion in solids
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Question 60
MTNAT2 marksNeeds review
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 0.859 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.
z | erf (z) |
|---|---|
0.3 | 0.3268 |
0.4 | 0.4284 |
0.5 | 0.5205 |
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2026MT
GATE MT 2026 · Paper 1
Metallurgical Engineering · Original paper archive
- Section
- Metallurgical Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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