During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to____________________?
Correct answer: B. Square root of time
- A. Time
- B. Square root of time
- C. Square of time
- D. Cube of time
Explanation
Decarburisation is controlled by diffusion of carbon, and diffusion distances grow according to the parabolic law, proportional to the square root of time. Thus doubling the time does not double the ferrite-layer thickness.
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