Which of the following heat treatment processes is used for softening the hardened material ?
Correct answer: B. Tempering
- A. Normalising
- B. Tempering
- C. Annealing
- D. None of these
Explanation
Tempering reheats hardened steel below its critical temperature, reducing excessive hardness and brittleness while improving toughness. Annealing also softens metals, but it is not the usual specified treatment after hardening in this context.
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