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Why are bigger sections not used in austempering?

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in Engineering Material & Metallurgy by (773k points)
Why are bigger sections not used in austempering?

(a) Unable to cool

(b) Does not fit in the working apparatus

(c) Decreased strength

(d) Cannot be cut

The question was asked in an international level competition.

My question comes from Interrupted Quenching topic in chapter Heat Treatment of Engineering Material & Metallurgy

1 Answer

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Right option is (a) Unable to cool

The best I can explain: Big sections cannot be used for austempering as they cannot be cooled rapidly to avoid the formation of pearlite. As a result, only small sections up to 9 mm thickness are suitable for this operation.

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