GATE XE · 2025 · XE-C
Question 56: Thermodynamics, Kinetics and Phase Transformations
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Question 56
XE-CMCQ2 marksNeeds review
The TTT diagram for eutectoid steel is shown below. The steel after complete austenitization at 1073 K is rapidly cooled to different temperatures and held for varying times (as indicated in Column I) followed by quenching to 300 K. Assuming isothermal transformation, match the heat treatment conditions in Column I with the corresponding microstructure in Column II.
Column I Column II
(P) Held at 300 K indefinitely (1) Bainite
(Q) Held at 873 K for 4 minutes (2) Martensite
(R) Held at 673 K for 20 minutes (3) Pearlite
(S) Held at 623 K for 2 minutes (4) Bainite + Martensite
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2025XE-C
GATE XE 2025 · Paper 1
Engineering Sciences · Original paper archive
- Section
- Section XE-C
- Question type
- Multiple choice (MCQ)
- Marks
- 2 marks
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