Question

Plastic working in the temperature range of 0.3-0.5 Tm is called _________

(a) Hot work

(b) Cold work

(c) Emboss

(d) Sheet metal

This question was posed to me by my college director while I was bunking the class.

This interesting question is from Nucleation, Growth and Segregation, Recovery, Recrystallisation and Grain Growth topic in section Mechanical Working Processes & Phase Transformations of Engineering Material & Metallurgy

Answer 1

Correct choice is (b) Cold work

To explain I would say: The density of point imperfections and dislocations increases with increasing plastic deformation in the temperature range below 0.3-0.5 Tm. Plastic working below this range is called as cold work. Here, Tm is the melting point in Kelvin.