Heat hardening is the process done at_______________?
Correct answer: A. Heating upto 250°C for 15 to 30 min
- A. Heating upto 250°C for 15 to 30 min
- B. Heating quickly upto 450°C followed by sudden quenching
- C. Heating 750°C and slowly cooling to zero degree
- D. Heating at 750°C and then quenching to room temperature
Explanation
Heat or age hardening involves holding the alloy at a moderate temperature for a period, allowing strengthening phases to precipitate and increase hardness. The listed 250°C treatment for 15 to 30 minutes is the intended description.
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