Strain Hardening

Question 1

What is strain hardening?

Answer 1

Increased resistance of a metal to further plastic deformation due to strain

Question 2

Strain hardening or cold working occurs at temperatures ___________ recrystallization temperature.

Answer 2

Below

Question 3

What is a slip?

Answer 3

A type of plastic deformation where a plane of atoms slips over another plane of atoms and assumes a new site within a space lattice

Question 4

What is twinning?

Answer 4

A type of type of plastic deformation where atoms in the crystal lattice are doubled into themselves

Question 5

What is the effect on dislocation density produced by cold working and what does it do?

Answer 5

Strain hardening increases dislocation density by pinning and dislocating crystal imperfections. This causes an increase in material strength and hardness and decreases ductility.

Question 6

Recovery occurs at temperatures ______________ recrystallization temperature.

Answer 6

Below

Question 7

What 3 factors is recrystallization temperature dependent on?

Answer 7

1) Original grain size before deformation
2) Amount of cold work
3) Temperature of cold work. The lower the temperature of cold work the lower the temperature of recrystallization.