Question:
Which of the following is a key characteristic of hot working processes?
Which of the following is a key characteristic of hot working processes?
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Hot working is done above the recrystallization temperature so that the metal stays soft and ductile, enabling easy deformation and preventing strain hardening.
Updated On: Jun 20, 2025
- Material is worked below its recrystallization temperature
- Material is worked above its recrystallization temperature
- Material does not undergo significant plastic deformation
- Material retains its shape and structure after deformation
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The Correct Option is B
Solution and Explanation
Hot working is a metal forming process carried out above the material’s recrystallization temperature.
At this elevated temperature:
- The material is softened, making it easier to deform plastically.
- New grains continuously form as the material is deformed, preventing strain hardening.
- The material can be shaped into complex forms without cracking.
In contrast, cold working occurs below the recrystallization temperature, which leads to strain hardening and increases in strength but reduces ductility.
Thus, the defining feature of hot working is that it occurs above the recrystallization temperature, allowing extensive plastic deformation without work hardening.
At this elevated temperature:
- The material is softened, making it easier to deform plastically.
- New grains continuously form as the material is deformed, preventing strain hardening.
- The material can be shaped into complex forms without cracking.
In contrast, cold working occurs below the recrystallization temperature, which leads to strain hardening and increases in strength but reduces ductility.
Thus, the defining feature of hot working is that it occurs above the recrystallization temperature, allowing extensive plastic deformation without work hardening.
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