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GATE 2020 ME (ME1) – Question 21

Engineering Materials · Phase diagrams and heat treatment · 1 mark · Multiple choice

Match each heat treatment with its effect. P: Tempering; Q: Quenching; R: Annealing; S: Normalizing. Effects: 1: Strengthening; 2: Toughening; 3: Hardening; 4: Softening.

  1. P–2, Q–3, R–4, S–1
  2. P–1, Q–1, R–3, S–2
  3. P–3, Q–3, R–1, S–3
  4. P–4, Q–3, R–2, S–1

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Show answer and explanation

Correct answer: (A) P–2, Q–3, R–4, S–1

Explanation

Tempering reduces brittleness and improves toughness (2). Quenching forms a hard microstructure (3). Annealing promotes softening (4). Normalizing refines the structure and increases strength relative to full annealing (1). **Answer: A.**