It is generally recognized that the kinetics of phase transformations during the cooling of steel products depends to a large extent on the state of the austenite after rolling. Austenite deformation (when recrystallization is not complete) and grain size have a strong influence on the nucleation and growth of low-temperature phases. Thus, the general objective of the present work was the formulation of a numerical model which simulates thermal, mechanical and microstructural phenomena during multipass hot rolling of flat bars. The simulation of flat bar rolling accounting for the evolution of a heterogeneous microstructure was the objective of the work. A conventional finite-element program was used to calculate the distribution of strains, stresses, and temperatures in the flat bar during rolling and during interpass times. The FE program was coupled with the stochastic model describing austenite microstructure evolution. In this model, the random character of the recrystallization was accounted for. Simulations supplied information about the distributions of the dislocation density and the grain size at various locations through the thickness of the bars.
W pracy opracowano kalibrowanie walców, które umożliwia wykorzystanie środnika złomowanej szyny kolejowej S60 do dalszego przerobu na półwyroby lub wyroby gotowe. Celem prowadzonych badań teoretycznych był dobór kształtów i wymiarów wykrojów oraz wartości odkształceń w kolejnych przepustach podczas walcowania prętów płaskich o wymiarze 70×14 mm. Wsadem do walcowania był środnik szyny kolejowej S60. Badania teoretyczne wykonano za pomocą programu komputerowego Forge2008®.
EN
In this work roll pass design, which allows using of the scrapped railway rail S60 for the further processing into semi-finished or finished products, was developed. The aim of the study was development of shape and dimensions the grooves and selection of strains in the various passes to the flat bars of dimension 70×14 mm. As a feedstock for the rolling process was the web of scrapped railway rail S60. Theoretical analysis was carried out by using computer program Forge2008®.
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