Question
Match the phases of steel in Group I with the crystal structures in Group II Group I Group II P. Martensite 1. bcc Q. Cementite 2. fcc R. Austenite 3. bct S. Ferrite 4. Orthorhombic
The correct answer is
P-3, Q-4, R-2, S-1
Steel Phases and Crystal Structures Match
This question requires matching common steel phases with their respective crystal structures.
Phase-Structure Correspondence
The correct pairings are established based on the crystallographic nature of each phase:
- P. Martensite: Exhibits a body-centered tetragonal (bct) structure.
- Q. Cementite (Fe3C): Possesses an orthorhombic crystal structure.
- R. Austenite: Features a face-centered cubic (fcc) structure.
- S. Ferrite (α-iron): Has a body-centered cubic (bcc) structure.
Summary of Matches
| Phase | Structure | Match |
| P. Martensite | 3. bct | P-3 |
| Q. Cementite | 4. Orthorhombic | Q-4 |
| R. Austenite | 2. fcc | R-2 |
| S. Ferrite | 1. bcc | S-1 |
The correct combination, matching Martensite to bct, Cementite to Orthorhombic, Austenite to fcc, and Ferrite to bcc, is P-3, Q-4, R-2, S-1.
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