Understanding Steel and Its Microstructures

What are steels primarily composed of?

• Iron and nickel

• Iron and carbon

• Iron and aluminum

• Iron and copper

What is the typical carbon content range for low carbon steels?

• 1.7-2.5 weight percentage

• 0.7-1.7 weight percentage

• 0.3-0.7 weight percentage

• 0.04-0.3 weight percentage

Which phase of iron is soft and magnetic?

• Alpha ferrite

• Austenite

• Cementite

• Delta-iron

At what temperature range does austenite (gamma phase iron) exist?

• 910-1391 °C

• 727-910 °C

• 1391-1538 °C

• Below 727 °C

What is the chemical composition of cementite?

• Fe3C

• Fe2C

• Fe4C

• FeC

What is the eutectoid composition of carbon in steel?

• 0.76 weight percentage

• 0.43 weight percentage

• 1.7 weight percentage

• 4.3 weight percentage

What is the main characteristic of high carbon steels?

• High ductility

• Low strength

• High hardness and abrasion resistance

• High corrosion resistance

What is the structure of alpha ferrite?

• Tetragonal

• Hexagonal close-packed (HCP)

• Face centred cubic (FCC)

• Body centred cubic (BCC)

What is the main difference between steels and cast irons?

• The amount of iron

• The amount of chromium

• The amount of carbon

• The amount of nickel

What is the typical application of low carbon steels?

• Car body panels

• Kitchen pots and pans

• Railway tracks

• Cutting tools