(2020) Grodecka, Karolina; Kusiak, Jan Centrum e-Learningu i Innowacyjnej Dydaktyki
Dzięki webinarowi: dowiesz się, czym są testy offline i kiedy warto ich użyć, zobaczysz, jak sprawnie przygotować testy do rozwiązywania przez studentów na zajęciach, nauczysz się, jak zautomatyzować ocenianie dużej ilości testów – oszczędzając czas i energię, posłuchasz doświadczeń z pierwszej ręki od praktyka stosującego testy offline.
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.
