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Hardness readings are taken every ________ after quenching in Jominy end-quench test.

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Hardness readings are taken every ________ after quenching in Jominy end-quench test.

(a) 0.01 mm

(b) 0.1 mm

(c) 1.6 mm

(d) 2.5 mm

I have been asked this question in exam.

This key question is from Hardening and Hardenability in chapter Heat Treatment of Engineering Material & Metallurgy

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Correct option is (c) 1.6 mm

To elaborate: The given sample of material is heated above the upper critical temperature. It is then quenched at one end at 25^oC. After cooling, a flat is ground along the length of the bar. Rockwell C hardness readings are then taken for every 1.6 mm along the length from the quenched end, which are then plotted in the form of a graph.

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