In body-centered cubic iron, carbon solubility is lower.

In body-centered cubic iron, carbon solubility is lower.

• A. Less
• B. The same
• C. Varied
• D. More

Answer: (A)

In iron, how much carbon can dissolve depends on the crystal structure. In body-centered cubic iron (ferrite), the interstitial spaces are small and fit carbon atoms with significant lattice distortion, so only a tiny amount can stay dissolved. That makes carbon solubility in BCC iron very low. In contrast, the face-centered cubic form (austenite) has larger interstitial sites, allowing much more carbon to dissolve. So saying carbon solubility is lower in body-centered cubic iron is correct, because the BCC structure inherently limits how much carbon can be accommodated.

In iron, how much carbon can dissolve depends on the crystal structure. In body-centered cubic iron (ferrite), the interstitial spaces are small and fit carbon atoms with significant lattice distortion, so only a tiny amount can stay dissolved. That makes carbon solubility in BCC iron very low. In contrast, the face-centered cubic form (austenite) has larger interstitial sites, allowing much more carbon to dissolve. So saying carbon solubility is lower in body-centered cubic iron is correct, because the BCC structure inherently limits how much carbon can be accommodated.