Topic: Material Science
The crystal structure of cementite is
- A. FCC
- B. BCC
- C. Tetragonal
- D. Orthorhombic
Answer: D. Orthorhombic
Explanation: Cementite ($Fe_{3}C$) is a very hard and brittle inter-metallic compound and has a significant influence on the properties of steels. Its crystal structure is orthorhombic. In comparison, Austenite has an FCC structure and Ferrite has a BCC structure.