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GATE 2022 MT – Question 22

Physical Metallurgy · Heat treatment and recrystallization · 1 mark · Multiple choice

The CCT diagram of a eutectoid steel with a superimposed cooling curve is shown in the figure. The microstructure at room temperature (RT) after this heat treatment is ____________

Diagram for GATE 2022 MT question 22
  1. pearlite only
  2. pearlite + retained austenite
  3. martensite only
  4. pearlite + martensite

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Show answer and explanation

Correct answer: (D) pearlite + martensite

Explanation

The curve enters the pearlite transformation region but leaves before reaching its completion boundary. Remaining austenite then cools below Ms and Mf to form martensite. Final microstructure is **pearlite plus martensite, D**.