T- Level Heat Treatment Techniques Quiz

Case hardening combines two types of metal. What are they?

• Low Carbon Steel and High/Medium Carbon Steel

• Steel and Aluminium

• Low Carbon Steel and Cast Iron

• Chromium and Vanadium

Why are hardened materials tempered or stress relieved?

• To improve hardness and toughness

• To improve hardness and strength

• To improve dimensional stability and toughness

• To improve dimensional stability and strength

What is the name of the process that involves the stages of solution annealing, quenching and ageing?

• Solution hardening

• Tempering

• Age Hardening

• Precipitation Hardening

Which heat treatment technique is used to make a metal softer and more workable?

• Tempering

• Annealing

• Normalising

• Quenching

What determines the exact ageing temperature?

• The composition of the material i.e. % carbon

• The age of the material

• The thickness of the material

• The amount of oxygen present

Give two methods for case hardening.

• Gas Carburising

• Precipitation Hardening

• Nitriding

• Tempering

• Flame or induction hardening

Give an engineering component that has been case hardened and explain why.

What are the three stages of ‘precipitation hardening’?

• Solution Annealing, Quenching,

  Ageing

• Quenching, Annealing, Normalising

• Solution Quenching, Annealing,

  Ageing

• Quenching, Normalising,

  Annealing

Once a material has been hardened or welded, what process is used to relieve stress to improve dimensional stability and toughness.

• Annealing

• Hardening

• Normalising

• Tempering

Can aluminium alloy be case hardened? Explain why.

• Yes

• No

Answer explanation

No. Aluminium does not contain carbon that changes the structure through heat treatment. Some aluminium’s can be surface/case hardened using Nitriding (see suspension forks on motorcycles and mountain bikes).