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How does the body-centred cubic structure of ferrite differ from the face-centred cubic structure of austenite?
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steel
Molten steel being poured into a ladle from an electric arc furnace, 1940s.
In the context of metallurgy, the difference between the body-centred cubic (bcc) structure of ferrite and the face-centred cubic (fcc) structure of austenite lies in the arrangement of iron atoms within the unit cube.12
- Body-Centred Cubic (Ferrite): This structure consists of a cube with iron atoms at each of the eight corners and one additional iron atom located in the centre of the cube.12
- Face-Centred Cubic (Austenite): This structure features iron atoms at each of the eight corners, with one additional iron atom positioned at the centre of each of the six faces of the cube.12
A significant consequence of these configurations is that the distances between neighbouring lattices in the fcc arrangement are approximately 25 percent larger than those in the bcc arrangement. This provides more interstitial space within the austenite structure, allowing it to hold more foreign atoms, such as carbon, in solid solution compared to ferrite.1