The hardenability of steel decreases with__________________?
Correct answer: D. Decrease in grain size
- A. Decrease in dislocation density
- B. Increase in solutionising temperature
- C. Increase in strength
- D. Decrease in grain size
Explanation
Fine-grained steel has more grain boundaries, which hinder the growth of martensite during quenching and reduce hardenability. Coarser grains generally increase hardenability, so decreasing grain size gives option d.
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