Gamma-iron occurs between the temperature ranges of
A
400°C to 600°C
B
600°C to 900°C
C
900°C to 1400°C
D
1400°C to 1530°C
Correct Answer: 900°C to 1400°C
As the iron cools further to 1,394°C its crystal structure changes to a face centered cubic (FCC) crystalline structure. In this form it is called gamma iron (γ-Fe) or Austenite. γ-iron can dissolve considerably more carbon (as much as 2.04% by mass at 1,146°C). This γ form of carbon saturation is exhibited in stainless steel.