(AGH University of Science and Technology Press, 2020) Wiktor, Tomasz; Sobula, Sebastian; Burbelko, Andriy A.; Ptasznik, Michał
The computer modeling of the solidification process in castings with local composite reinforcement (LCR) obtained as a result of in situ reactions of self-propagating high temperature synthesis (SHS) is difficult due to limited data on the thermo-physical parameters of exothermic effects and the kinetics of the synthesis reaction. In the present study, Hadfield cast steel casting was manufactured with LCR containing titanium carbide particles obtained in situ by the SHS method. Reaction kinetics of titanium carbide synthesis in the composite casting were determined on the basis of temperature measurements in the area of LCR during the process. For the estimation of the reaction, the Fourier Thermal Analysis method was used. The paper presents the results of temperature measurement and the results of the calculation of SHS reaction kinetics. It was found that the reaction time under the conditions of the analyzed casting is below 3 s.
(Wydawnictwa AGH, 2023) Żołynia, Szymon; Sobula, Sebastian
The problem of the heat treatment technology of cast steel with use of modern simulation tools is important to the today’s engineer. The main purpose of thesis was experimental verification of the numerical simulation results of L500-II carbon cast steel heat treatment. In accordance to the assumption, a computer simulation of the heat treatment process was carried out using the Visual-Weld (Sysweld) software. Experimental tests, during which the cooling curves were recorded, were carried out simultaneously. After conducted quenching in water, the hardness distribution on the cross-section of the sample was examined, as well as the microstructure in selected areas, using a light microscope and ImageJ software. It was shown, that the results of the numerical simulation are different from those obtained in the experiment.
