Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250- 525°C, thereby changing austenite to___________________?
Correct answer: B. Bainite
- A. Sorbite
- B. Bainite
- C. Martensite
- D. Troostite
Explanation
Austempering cools austenite rapidly to the bainite transformation range and holds it there until transformation occurs. The resulting structure is bainite, rather than martensite, which forms after quenching below the martensite-start temperature.
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