4. (a) Name industrial processes in which: Diffusion in the solid is essential. Diffusion in the...

4. (a) Name industrial processes in which:

Diffusion in the solid is essential.
Diffusion in the solid must be prevented.

(b) Why are the steel gears case hardened? (5 p).

(c) For a 1020 steel it has been determined that a carburizing treatment of 15 hr duration at 900 ⁰C will raise the carbon concentration to 0.35 wt% at a point 2.0 mm from the surface. Estimate the time necessary to achieve the same carbon concentration at a 6.0 mm position from the surface for the same steel and at the same carburizing temperature.

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samet mamat answered 2 years ago

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