High endurance limit of carburised machine parts is because of the fact that carburisation __________________?
Correct answer: A. Introduces a compressive layer on the surface
- A. Introduces a compressive layer on the surface
- B. Enhances the yield point of the material
- C. Suppresses any stress concentration produced in the parts
- D. Produces a better surface finish
Explanation
Carburisation hardens the surface and creates a compressive residual-stress layer, which improves fatigue resistance and raises the endurance limit. It does not primarily work by eliminating stress concentrations or improving surface finish.
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