Browsing by Subject "makrosegregacja"

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Access status: Open Access ,
Numeryczne modelowanie zjawisk segregacji i pękania wlewka w końcowym etapie ciągłego odlewania stali
(2008-05-26) (Data obrony: 2011) Rec, Tomasz
Wydział Inżynierii Metali i Informatyki Przemysłowej
The main thesis of research was development numerical model of continuous casting process with mechanical soft reduction process. The central segregation occurs in continuously cast ingot influence on mechanical properties, chemical composition and microstructure of final products. Formation and evolution of central segregation in continuously cast ingot dependent on many factors (steel chemistry, casting speed, cooling regime, machine geometry). The researches presented in literature show that segregation in continuous ingot can be decrease by using soft reduction process at the end stage of continuous casting process. Efficiency of soft reduction dependents on the values reduction, contents of liquid phase in center of ingot moreover parameters of continuous casting process. Moreover, the soft reduction process to change the stress-strain state in the slab and it can cause formation cracks on slab surface. The development of optimal parameters of soft reduction process is difficult task. The purpose of this work was develop a numerical FEM model of continuous casting process with soft reduction process and optimization of parameters of soft reduction for industrial example. The proposed numerical model of slabs casting with soft reduction technology takes into ac-count the processes of crystallization, thermal stress, diffusion, macrosegregation and mechanical deformation. Base on developed model continuous casting process a series of computer simulation were performer for the industrial conditions.