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Asked: 2020-05-06T21:58:25+05:30 In:

GATE MT 2020 Q8. A heavily cold-worked metal will

Poll Results

5%Yield a coarser recrystallized grain size. ( 3 voters )
15%Have a higher energy barrier for nucleation of recrystallized grains. ( 9 voters )
10%Possess a lower driving force for recrytallization. ( 6 voters )
70%Recrystallize at lower temperatures. ( 42 voters )
Based On 60 Votes

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GATE MT 2020 Q8. A heavily cold-worked metal will
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    5 Answers

    1. Platinum Gate aspirant.

      Heavily cold working means more deformation or more strain energy. So incubation period decreases and faster recrystallization happens so lower temperature is needed.

      Heavily cold working means more deformation or more strain energy. So incubation period decreases and faster recrystallization happens so lower temperature is needed.

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    2. Gold

      Recrystallised at lower temperatures

      Recrystallised at lower temperatures

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    3. Silver Student

      Heavily cold work material has more strained grains. So, recrystallization will take place easily which means it happens at low temperature.

      Heavily cold work material has more strained grains. So, recrystallization will take place easily which means it happens at low temperature.

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    4. Best Answer
      Gold Coaching Institute for GATE Metallurgy having dedicated faculty pool from IITs & IISC.
      This answer was edited.

      Answer is D -  lower the recrystallization temperature. recrystallization is one of the steps encountered during Annealing of materials. Annealing - consists of Recovery, Recrystallization and grain growth. Driving force for recrystallization is stored energy inside material during cold working. avaRead more

      Answer is D –  lower the recrystallization temperature.

      • recrystallization is one of the steps encountered during Annealing of materials.
      • Annealing – consists of Recovery, Recrystallization and grain growth.
      • Driving force for recrystallization is stored energy inside material during cold working.
      • available enegy – stored energy,  to achieve recrystallization – heating to recrystallization temperature.

      Stored energy is inversely proportional to recrystallization temperature.

      Stored energy is combination of all energies of vacancies, disloactions, interstitials that are generated during cold wokring.

      “Higher is the cold wokring (% deformation) higher is the stored energy during cold working and finally lower will be the recrystallization temperature.”

      In a similar manner you can relate other parameters (i.e. deformation temperrrature, intial grain size, purity) to store energy and indirectly to recrystallization temperature.

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    5. Platinum GATE Metallurgy Coaching

      Lower recrystallisation temperature

      Lower recrystallisation temperature

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