| Abstrakt: |
1.A study was made of the dissolution mechanism of Cr3C2 in iron. It was established that the reaction of orthorhombic chromium carbide with iron begins at 350–400°C and, up to the beginning ofa?? transformation, manifests itself in diffusional exchange of iron and chromium atoms and in the formation of a special orthorhombic carbide. In the temperature range of existence of?-iron, the dissolution of the orthorhombic carbide is preceded by its recrystallization into the hexagonal form and the latter's enrichment in iron to a content close to the solubility limit of iron.2.Up to a temperature of ~1050°C, the carbide dissolution process is limited by the (CrFe)3C2? (CrFe)7C3 transformation. Above 1050°C, diffusion becomes the link controlling the rate of the process.3.Orthorhombic chromium carbide dissolves quite rapidly in iron, and can therefore be employed as an alloying addition. |
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