Sub zero treatment of steel is done to____________________?
Correct answer: C. Reduce the retained austenite in hardened steel
- A. Suppress martensite transformation
- B. Enhance its working performance in sub zero atmosphere
- C. Reduce the retained austenite in hardened steel
- D. Induce temper brittleness after its hardening
Explanation
Sub-zero treatment converts retained austenite into martensite after hardening, improving dimensional stability and hardness. It therefore reduces the amount of retained austenite.
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