The GATE Grind

GATE Engineering Materials: Phase diagrams and heat treatment – Previous Year Questions

4 GATE previous year questions on Phase diagrams and heat treatment (Engineering Materials, Mechanical Engineering) with answers and explanations, from every paper.

  1. GATE 2022 ME (ME1) Q41 (2 marks, Multiple choice) – In Fe-Fe 3C phase diagram, the eutectoid composition is 0.8 weight % of carbon at 725 °C. The maximum solubility of carbon in α-ferrite phase is 0.025…
  2. GATE 2023 ME Q52 (2 marks, Numerical answer) – A steel sample with 1.5 wt.% carbon (no other alloying elements present) is slowly cooled from 1100 °C to just below the eutectoid temperature (723…
  3. GATE 2024 ME Q28 (1 mark, Multiple choice) – The phases present in pearlite are
  4. GATE 2025 ME Q20 (1 mark, Multiple choice) – Among the following surface hardening processes, steel is heated to the lowest temperature in