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  3. 4. (a) name industrial processes in which: diff

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

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Mechanical Engineering

4. (a) Name industrialprocesses in which:

  1. Diffusion in the solid is essential.

  2. Diffusion in the solid must be prevented.

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

(c) For a 1020 steelit has been determined that a carburizing treatment of 15 hrduration at 900 0C will raise the carbon concentrationto 0.35 wt% at a point 2.0 mm from the surface. Estimate the timenecessary to achieve the same carbon concentration at a 6.0 mmposition from the surface for the same steel and at the samecarburizing temperature.

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