18 TF Two specimens of the same ealae ted to the same resrystallisacion temper f

Question

18 TF Two specimens of the same ealae ted to the same resrystallisacion temper for the same (relatively short) period of time. The specimen starting with the smaller amoust of coild week will have the smaller recrystallized grain size 19. T/F When work is perfiomed on a mectal work piece at a senperature ahove the metal's recrystallization temperatue, the work can be eitdher codd-week or hot-wek depending on the strain rate (speod at which work is performed) 20. Which one of the following will slow o etaed , make more difficult) the recryallization of a cold worked metal? a increase the amount of oold werk done before heating b use a metal thar bad a smaller grain sine before heating incense the temperature at which the metal ", hemed d. add insoluble particles e add substinutional alloying elenents 21. Which one of the following is a benefit of hot-working over cold-working manufacturing processes? a increases in strength and hardness b high amount of deformation c. bettor control of dimensional selerances d better surface finish e less axidation

Explanation / Answer

18) False....lesser the cold work, more the recrystallised grain size

19) false....The work can be hot work if the temperature is above the metal's recrystallisation temperature.

20) e) add substitutional alloying elements

21) b) high amount of deformation...rest all option are benefit of cold working over hot working

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