Question

Why can’t cold working be used for strengthening in case of plastic deformation?

(a) Recrystallization

(b) Thermal instability

(c) Lowers tensile strength

(d) Introduces coarsening

The question was posed to me in homework.

The above asked question is from Mechanisms of Creep & Creep Resistant Materials topic in portion Plastic Deformation and Creep in Crystalline Materials, Elastic, Anelastic and Viscoelastic Behaviour of Engineering Material & Metallurgy

Answer 1

Correct option is (a) Recrystallization

Explanation: At temperatures above 0.4 Tm, recrystallization occurs readily. This results in the loss of strength of the cold-worked material. Therefore, for plastic deformation, cold working is generally avoided for creep resistance.