Heat Treatment Quiz

What is the result of normalising steel?

• Tough with some ductility

• Hard but brittle

• Soft with high ductility

• Soft and brittle

Which process involves allowing the grains within the metal to grow, making the metal softer and easier to work?

• Precipitation hardening

• Annealing

• Hardening

• Quenching

What is the purpose of annealing copper?

• To make it easier to work

• To make it brittle

• To remove black scale

• To increase strength

What is the critical point temperature for annealing steel?

• Just above the upper critical point

• Just below the lower critical point

• At the melting point

• At room temperature

How is aluminium alloy annealed after working?

• By soaking at 350-400°C

• By cooling in water

• By heating to a dull red colour

• By leaving it in the furnace after switching off

What is the purpose of quenching in the hardening process?

Which type of steel can be hardened by heat treatment?

• Stainless steel

• High-carbon steel

• Alloy steel

• Low-carbon steel

What structure does steel form after quenching?

• Martensite

• Austenite

• Pearlite

• Ferrite

What is the purpose of tempering quenched steel?

• To reduce toughness

• To increase brittleness

• To increase hardness

• To reduce hardness

What is the result of precipitation hardening in aluminium alloys?

• Decreased ductility

• Increased ductility

• Decreased strength

• Increased strength