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Match the phases of steel in Group I with the crystal structures in...

Q.  
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


Answer & Explanation

Different phases of steel have distinct crystal structures that affect their mechanical properties. Martensite, formed through rapid cooling, has a body-centered tetragonal (bct) structure. Cementite, an iron carbide, has an orthorhombic structure. Austenite, which exists at high temperatures, has a face-centered cubic (fcc) structure, while Ferrite, a form of pure iron, has a body-centered cubic (bcc) structure. Understanding these structures helps in determining how steel behaves under various conditions, such as strength, toughness, and hardness.

Thus correct option is: C.

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