______________ cannot increase the fatigue strength of a material?
Correct answer: C. Grain coarsening
- A. Grain refining
- B. Surface hardening
- C. Grain coarsening
- D. Shot peening
Explanation
Grain refinement, surface hardening, and shot peening can improve fatigue resistance by strengthening the material or introducing compressive surface stress. Grain coarsening generally reduces toughness and fatigue strength rather than increasing it.
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