The GATE Grind

GATE 2022 MT – Question 32

Mechanical Behaviour of Materials · Creep · 1 mark · Multiple select

While designing a material for high temperature application, which of the following characteristic(s)/attribute(s) is(are) desirable for achieving better creep resistance?

  1. Fine grain size
  2. FCC crystal structure
  3. High melting point
  4. Cold worked microstructure

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Show answer and explanation

Correct answer: (B) FCC crystal structure; (C) High melting point

Explanation

A high melting point lowers homologous temperature for a given service temperature. Close-packed FCC structures commonly offer useful high-temperature stability and resistance. Fine grains promote boundary/diffusional creep, and cold-work strengthening is lost by recovery. The keyed features are **B,C**.