The GATE Grind

GATE 2026 PI – Question 18

General Engineering · Engineering Materials · 1 mark · Multiple choice

A plain-carbon steel of eutectoid composition is heat treated from austenitizing temperature to obtain ONLY bainite. Which heat treatment is used?

  1. Normalizing
  2. Annealing
  3. Martempering
  4. Austempering

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Correct answer: (D) Austempering

Explanation

Austempering quenches austenite to a temperature in the bainitic range and holds it until transformation is complete, producing bainite. Martempering instead equalizes temperature before martensitic transformation; normalizing and annealing normally produce pearlitic structures. **D**.

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