Difficulty: Easy
Correct Answer: Stress relief → recrystallisation → grain growth
Explanation:
Concept/Approach
During annealing of cold-worked steels, three phenomena occur in order: (1) stress relief (recovery), (2) recrystallisation, (3) grain growth.
Why this order?
• Stress relief / recovery: dislocation rearrangement lowers residual stresses without new grains forming.• Recrystallisation: new, strain-free grains nucleate and grow, replacing the deformed structure.• Grain growth: existing recrystallised grains coarsen when held longer/hotter.
Common pitfalls
Confusing recovery with recrystallisation, or assuming grain growth can precede recrystallisation.
Final Answer
Stress relief → recrystallisation → grain growth
Discussion & Comments