GATE MT · 2024 · MT
Question 42: Principles of heat treatment of steels, TTT and CT diagrams; Surface hardening treatments; Recovery, recrystallization and grain growth; Heat treatment of cast iron and aluminium alloys.
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Question 42
MTMCQ2 marksNeeds review
The microstructures of a quenched steel tempered at three temperatures
for a fixed time are schematically illustrated. The solid circles represent cementite particles in ferrite matrix;
,
and
are average radii of cementite particles, and
,
and
are volume fractions of cementite at temperatures
,
and
, respectively. If the cementite in steel is more noble than ferrite, then which one of the three microstructures will have the highest corrosion rate when exposed to an aqueous solution of 3.5 wt. % NaCl? 
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2024MT
GATE MT 2024 · Paper 1
Metallurgical Engineering · Original paper archive
- Section
- Metallurgical Engineering
- Question type
- Multiple choice (MCQ)
- Marks
- 2 marks
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