Maximum change in the hardness of martensite occurs in the carbon content range of _____________ percent in steel?
Correct answer: B. 0.2 to 0.4
- A. 0.01 to 0.10
- B. 0.2 to 0.4
- C. 0.5 to 0.7
- D. 0.8 to 1.0
Explanation
Martensite hardness rises most sharply as carbon increases through approximately the 0.2 to 0.4% range, because carbon strongly strengthens the supersaturated martensitic structure there. At higher carbon contents, the increase becomes less pronounced.
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