Iron carbon phase diagram

Steel are alloys of

• ferum and carbon

• ferrite and austenite

• cementite

alpha ferrite has a _________ cyristal structure

• BCC

• FCC

• cementite

α- ferrite has a _________ cyristal structure

• BCC

• FCC

The composition axis of the Iron-Carbide phase diagram extends only to _______ wt %

• 4.3

• 6.7

• 7.0

Pure iron metal melts at

• ^{1147 o}C

• 727^oC

• 1538 ^oC

Austenite has a _______ crystal structure

• FCC

• HCP

• BCC

α-ferrite will transform to FCC y-austenite at

• 717^oC

• 1147^oC

• 912^oC

δ-ferrite is stable only at very _________ temperature

• low

• high

• intermediate

γ-iron also known as

• Austenite

• cementite

• Ferrite

α-iron also known as

• Austenite

• cementite

• Ferrite