Modeling Steel Deformation in the Semi-Solid State by Marcin Hojny

Author:Marcin Hojny
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

7.2.3 Steel Ductility in the Continuous Casting Process

Preparing characteristics of ductility, which are the basis for determining steel susceptibility to cracking in the continuous casting process, is a very important area of simulation tests [2]. The integrated casting and rolling process is presented schematically in Fig. 7.26. The sub-surface area of the cast strand is subjected to very complex thermo-mechanical loads caused by intense water cooling within the secondary cooling zone, a cyclical impact of guide rolls, and plastic deformations during straightening operations. On the other hand, as the temperature decreases, the elements segregate, and phase transformations and precipitation processes occur in steel. These processes strongly affect the mechanical properties. If the steel does not show adequate ductility at high temperatures, it is very likely that the cracking process will be initiated at the surfaces and edges of the cast strand at the subsequent stages of the casting process, in particular during straightening, when the surface and edges are substantially cooled. The cracks that occur during casting may not be welded in the rolling process, which substantially reduces the final product quality, and sometimes it can cause its rejection. Knowing the mechanical properties of steel at high temperatures, and in particular the ranges of reduced ductility, we can effectively control the steel casting process to prevent cracking.

Fig. 7.26Diagram of critical stages of the continuous casting process (1–4), when there is a high probability of initiation of cracks, which may develop during rolling in conditions of strong tensile stress (5)

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