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How does induction hardening differ from flame hardening?

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How does induction hardening differ from flame hardening?

(a) Electric current is used

(b) Higher quenching time

(c) Low-temperature operation

(d) Results In fine grain structure

This question was posed to me in unit test.

The above asked question is from Selective Hardening topic in chapter Heat Treatment of Engineering Material & Metallurgy

1 Answer

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Best answer
Right choice is (a) Electric current is used

Best explanation: The basic mechanism of both induction and flame hardening techniques remains the same. In induction hardening, however, the heat source is derived from the resistance to induced eddy currents.

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