Module 2 - heat treatment ferrous metals

Question 1

What is a ferrous Metal?

Answer 1

Any metal that contains iron

Question 2

What is annealing?

Answer 2

Annealing is a treatment process that is performed to change the physical properties of a metal. The annealing process requires the metal to be heated above its recrystalization process and be kept there for a certain period of time.

Question 3

What is normalising

Answer 3

Normalising involves heating a material to a high temperature and allowing it to cool down to room temperature. This process alters the microstructure which reduces its hardness and increases ductility.

Question 4

What is hardening?

Answer 4

The Hardening process involves heating a steel to red hot and cooling in water or oil (Quenched) This rapid cooling creates a highly stressed martensite. This metal is very brittle and hard and must be tempered.

Question 5

What is tempering?

Answer 5

The tempering process is used to toughen metals and reduce the unwanted brittleness and hardness which occurs when quenching. Tempering is done by heating the metal to a point when the internal stresses diffusses followed by slow cooling in air.

Question 6

What are some examples of ferrous metals?

Answer 6

Wrought Iron, Steel, White Cast iron, stainless steel, and grey cast iron.

Question 7

What are surface hardening methods?

Answer 7

Carburising
Nitriding
Flame Hardening
Induction Hardening

Question 8

What is surface hardening?

Answer 8

Surface hardening is the process or hardening a metals surface t make it resistant to abbrasion and wear.