GATE 2020 PI – Question 16
General Engineering · Engineering Materials · 1 mark · Multiple choice
Match steel phases P ferrite, Q austenite, R martensite to crystal structures1 HCP,2 BCC,3 BCT,4 FCC.
- P–2,Q–4,R–3
- P–4,Q–2,R–3
- P–2,Q–4,R–1
- P–4,Q–2,R–1
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Show answer and explanation
Correct answer: (A) P–2,Q–4,R–3
Explanation
Ferrite is body-centred cubic, austenite face-centred cubic and carbon-containing martensite body-centred tetragonal. Therefore P–2,Q–4,R–3 is A. Martensite’s trapped interstitial carbon produces tetragonal distortion.
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