4. Consequences of the segregation of wrought products
The segregation of soluble elements in steel can be attenuated during the wrought process by the phenomenon of limited diffusion. Insoluble elements, on the other hand, give rise to separate phases (inclusions, primary carbides) that remain in place, especially if they are massive.
4.1 Homogenization of soluble elements
Immediately after solidification, the concentration of alloying elements is very high in all segregated zones, at all scales. However, maintaining high temperatures allows alloying elements to diffuse towards the dendritic axes, smoothing the concentration curve as a function of distance in the cast product.
Diffusion speed depends on concentration gradient and temperature. In practice, good homogenization of a cast state...
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Consequences of the segregation of wrought products
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