Influence of Temperature on Crystal Structure
The crystal structure of steel changes with increasing temperature. For pure iron this change occurs at 910° C. The body-centred cubic (bcc) crystals of Figure 2 change to face-centred cubic (fcc) crystals as illustrated in Figure 3. For fcc crystals the atoms of iron are on the cube corners and at the centres of each face of the cube. The body-centred position is empty.
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