1. General
In the case of steels, the structural transformations described above interfere with the allotropic transformations of iron, i.e. its changes in crystal system.
1.1 Allotropic iron transformations
Between – 273°C and 912°C on the one hand, and from 1,394°C to 1,538°C on the other, the crystalline structure of pure iron is cubic-centered (CC) (this structure is not compact); in this state, the iron atoms occupy the vertices and center of a cube whose edge, at 20°C, measures 0.2866 nm (0.286 nm at – 273°C, 0.2903 nm at 912°C, 0.293 nm at 1,394°C).
Between –273°C and 912°C, the crystalline form of iron is known as "iron
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General
Transformations
Standardization
French Standards Association (AFNOR)
- Valeurs de convention dureté-résistance à la traction de l'acier - NF A 03-173 - 11-84
- Essai de trempabilité Jominy - NF A 04-303 - 06-79
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Micrographs
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