Question

Which of the following is not applicable for prevention of fatigue fracture?

(a) Reduction of corrosive environment

(b) Coarse grain structure

(c) No residual stresses

(d) Good surface finish

This question was posed to me during an interview.

I'd like to ask this question from Fracture Toughness, Protection against Fracture topic in division Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

Answer 1

The correct option is (b) Coarse grain structure

Easy explanation: To prevent fatigue fracture, a good design must be used to avoid stresses, and must have no residual stresses or dislocations. It must have a fine grain structure and a control over the surface finish. Special care must be taken to effect of corrosion by polishing and coating the material.