Q200
Delta-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
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
As molten iron cools down, it solidifies at 1,538°C (2,800°F) into its δ allotrope, which has a body-centered cubic (BCC) crystal structure. δ-iron can dissolve as much as 0.08% of carbon by mass at 1,475°C.