Cooling of Pure Iron | Material Science | by Prateek Gaikwad

Iron is relatively soft and ductile
● It shows the property of allotropy (exist in more than one crystal structure)
● Its melting point is 1539 ºC
● At normal room temperature iron has BCC structure and is called α-Fe or α-ferrite
● Solubility of carbon in α-Fe is very low (0.008% at room temperature and 0.025% at
its stable temperature
● At 910 ºC it changes to FCC structure and is called γ-Fe or austenite
● maximum solubility of carbon in γ-Fe is 2.04% at 1148 ºC
● At 1401 ºC it again changes to BCC structure and is called δ-Fe or δ-ferrite
● Maximum solubility of carbon in δ-Fe is 0.1 % at 1493 ºC
● At 768 ºC magnetic property of Fe disappears and it becomes nonmagnetic
● Critical temperature of pure iron are 1401 ºC, 910 ºC and 768 ºC (curie point)