During quenching, martensite is produced:

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SSC JE ME Previous Paper 8 (Held on: 27 Sep 2019 Morning)
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  1. with an appropriate cooling rate such that the carbon has time to migrate
  2. with low cooling rate
  3. rapid cooling rate
  4. medium cooling rate

Answer (Detailed Solution Below)

Option 3 : rapid cooling rate
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Explanation:

RRB JE ME 54 15Q Machining CH 4 Hindi images nita q15

Quenching is the rapid cooling of a work-piece to obtain certain material properties.

If the cooling rate is very high then the entire austenite is converted into martensite because the cooling curve does not enter the pearlite region as shown in figure below.

F1 S.S Madhu 13.01.20 D7

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