Iron Carbon phase diagram

What are the two most common crystal structures in metals?

• Hexagonal and cubic

• Tetragonal and orthorhombic

• Body centered cubic and face centered cubic

• Simple cubic and hexagonal close-packed

What is the line of intersection between grains called?

• Boundary limit

• Atom line

• Crystal edge

• Grain boundary

What happens to the electromagnetic bonds when a force is applied to a metal?

• They immediately break

• They stretch, allowing atoms to move slightly

• They become stronger

• They do not change

At what temperature does ferrite's body centered cubic structure rearrange into a face centered cubic structure known as austenite?

• 2066 degrees Fahrenheit

• 1700 degrees Fahrenheit

• 1670 degrees Fahrenheit

• 1333 degrees Fahrenheit

What is the maximum amount of carbon that can be absorbed by austenite at 2066 degrees Fahrenheit?

• 0.025 percent

• 0.80 percent

• 2.0 percent

• 6.67 percent

What is cementite also known as?

• Ferrite

• Iron carbide

• Carbon steel

• Austenite

What is the carbon content range in most steels?

• More than 2.0 percent

• Exactly 6.67 percent

• Less than 0.025 percent

• Less than 2.0 percent

What structure is formed at room temperature if steel containing 0.030 percent carbon is cooled slowly?

• Entirely austenite

• Mostly ferrite with patches of pearlite

• Mixture of ferrite and cementite

• Entirely ferrite