Learning Unit 2

Question 1

Name 4 heat treatment objectives of ferrous metals.

Answer 1

• Internal stress relieving
• Reducing grain size
• Increase toughness
• Increasing or decreasing hardness

Question 2

Describe the heat treatment referred to as annealing.

Answer 2

It involves heating of the steel above critical temperature and keeping it at that temperature for a certain time and finally cooling it very slowly.

Question 3

Describe the heat treatment referred to as hardening.

Answer 3

Hardening is carried out by heating the steel near its critical temperature, followed by fast cooling in water, oil, or brine solution.

Question 4

What heat treatment is used for non-ferrous metals?

Answer 4

Age hardening.