Question

With the increase in annealing time of cold worked metals, its recrystallisation temperature

• A. Increases
• B. Decreases
• C. Remains same
• D. Depends upon type of metal

Hint:

Time and Temperature are interchangeable. More time means you can use less heat to get the same result.

Answer 1

The Correct Option is B

Step 1: Concept Recrystallization is a thermally activated process that depends on both temperature and time.

Step 2: Meaning The recrystallization temperature is not a fixed constant; it is defined as the temperature at which recrystallization is complete within a specific time (usually 1 hour).

Step 3: Analysis Diffusion and grain boundary migration are time-dependent; if more time is allowed, the atoms can rearrange at a lower thermal energy state.

Step 4: Conclusion Therefore, increasing the annealing time allows recrystallization to occur at a lower temperature. Final Answer: (B)