Keynote Speakers
Mihaly REGER
Professor. PhD
Rector of Óbuda University, Hungary
Prof. MIhaly REGER is the rector of Óbuda University since 2016. In 2012 was entitled Doctor of the Hungarian Academy of Sciences, being Habilitated since 2010, having its PhD defended in 1998. He was Head of Institute of Materials and Technology, Banki Donat Faculty of Mechanical and Safety Engineering, Óbuda University from 2011 to 2016. His Main research fields are continuous casting of steels, formation of surface and subsurface defects, modeling of solidification process (physical and mathematical), solidification of transparent materials, direct observation and image analysis of solidified structures, steady and non-steady state solidification, heat treatment, surface laser treatment, modeling of metallurgical and heat treating processes. He has published over 230 articles with more than 110 citations (without self citations). Detailed list of publications https://m2.mtmt.hu/gui2/?type=authors&mode=browse&sel=10001931
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DEFECT FREE STEEL CONTINUOUS CASTING, THE ROLE OF MATHEMATICAL MODELLING
Mathematical modeling is a useful tool for predicting material properties even in case of complex technological processes. One of the most complicated processes in the mass production of steels is continuous casting. Defect free casting requires an excellent accordance between steel properties being cast and the technological parameters, especially from the aspect of inner quality and homogeneity of cast products. As an example, one of the most unpredictable defects of cast slabs is the centerline segregation can be mentioned. The centerline segregation in slabs develops in a complex way; it is connected partly to the macrosegregation and partly to the shrinkage of solidifying melt. As a result of these processes, the centerline segregated part of the slab will have a different chemical composition compared to the average composition and/or it will contain shrinkage holes, discontinuities and inclusions. After the solidification process during hot rolling the complex shaped interdendritic holes will be closed as a function of applied strains. The difference in chemical composition will remain even after the slab has spent several hours at over 1000 oC in the soaking furnace before hot rolling. Hot rolled products (heavy plates, strips) with centerline segregation will contain, depending on the solidification and technological parameters, a middle part with a chemical composition dissimilar to the average. According to industrial experiences, the segregation level (including the carbon content) can hardly be decreased by heat treatment.