Manufacturing Processes - 1 - Mechanical Engineering (MCQ) questions and answers for Q. 3642

Q.  Chances of crack propagation are more in
- Published on 03 Aug 15

a. cold working process
b. hot working process
c. both a. and b.
d. none of the above

ANSWER: cold working process

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  • Pankaj   -Posted on 29 Oct 15
    - Cold working process is carried out at the temperature below the recrystallisation temperature whereas hot working process is carried out at the temperature above the recrystallisation temperature. Both the processes are plastic deformation.

    - The grains in metal are permanently distorted in cold working as it does not reaches at the recrystallisation temperature.

    - In cold working process, ductility of metal reduces as compared to the hot working process.

    - Therefore, crack propagation is more in cold working process.

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