Autor: Burbelko, Andriy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Impact of Values of Diffusion Coefficient on Results of Diffusion Modelling Driven by Chemical Potential Gradien
Autorzy:: Wróbel, Marek
Burbelko, Andriy
Powiązania:: https://bibliotekanauki.pl/articles/2174626.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: foundry industry
application of information technology
diffusion modelling
Calphad method
chemical potential
diffusion coefficient
przemysł odlewniczy
zastosowanie technologii informatycznej
modelowanie dyfuzyjne
metoda Calphad
potencjał chemiczny
współczynnik dyfuzji
Opis:: In the paper critical role of including the right material parameters, as input values for computer modelling, is stressed. The presented model of diffusion, based on chemical potential gradient, in order to perform calculations, requires a parameter called mobility, which can be calculated using the diffusion coefficient. When analysing the diffusion problem, it is a common practice to assume the diffusion coefficient to be a constant within the range of temperature and chemical composition considered. By doing so the calculations are considerably simplified at the cost of the accuracy of the results. In order to make a reasoned decision, whether this simplification is desirable for particular systems and conditions, its impact on the accuracy of calculations needs to be assessed. The paper presents such evaluation by comparing results of modelling with a constant value of diffusion coefficient to results where the dependency of Di on temperature, chemical composition or both are added. The results show how a given deviation of diffusivity is correlated with the change in the final results. Simulations were performed in a single dimension for the FCC phase in Fe-C, Fe-Si and Fe-Mn systems. Different initial compositions and temperature profiles were used.
Źródło:: Archives of Foundry Engineering; 2022, 22, 3; 81--90
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A Diffusion Model of Binary Systems Controlled by Chemical Potential Gradient
Autorzy:: Wróbel, Marek
Burbelko, Andriy
Powiązania:: https://bibliotekanauki.pl/articles/2105206.pdf
Data publikacji:: 2022
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: diffusion
modelling
CALPHAD
chemical potential
Opis:: The paper presents a model of diffusion in a single phase with chemical potential gradient as the driving force of the process. Fick’s laws are strictly empirical and the assumption that the concentration gradients are the driving forces of diffusion is far from precise. Instead, the gradient of chemical potential μi of component i is the real driving force. The matter of governing equations of models that incorporate this approach will be raised and discussed in this article. One of more important features is the ability to acquire results where diffusion against the concentration gradient may occur. The presented model uses the Finite Difference Method (FDM) and employs the CALPHAD method to obtain chemical potentials. The calculations of chemical potential are carried out for instant conditions – temperature and composition – in the entire task domain by Thermo-Calc via a TQ-Interface. Then the heterogeneity of chemical potentials is translated into mass transfer for each individual element. Calculations of two modelling tasks for one-dimension diffusion field were carried out. First: isothermal conditions with linear initial composition distribution and second: constant temperature gradient with uniform chemical composition in the specimen. Results for two binary solid solutions: Fe-C and Fe-Si, in the FCC phase for the given tasks will be presented. Modelling allows us to estimate the time needed to reach a desired state in a particular equilibrium or quasi-equilibrium state. It also shows the path of the composition change during the process. This can be used to determine whether the system at some point is getting close to the formation of another phase due to significant deviation from its initial conditions.
Źródło:: Journal of Casting & Materials Engineering; 2022, 6, 2; 39--44
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Derivation of Equations for a Size Distribution of Spherical Particles in Non-Transparent Materials
Autorzy:: Gurgul, Daniel
Burbelko, Andriy
Wiktor, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2056033.pdf
Data publikacji:: 2021
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: planimetric analysis
linear analysis
estimation of diameter sizes distribution
probability density function
analiza planimetryczna
analiza liniowa
szacowanie rozkładu wielkości średnic
funkcja gęstości prawdopodobieństwa
Opis:: This paper presents a new proposition on how to derive mathematical formulas that describe an unknown Probability Density Function (PDF3) of the spherical radii (r3) of particles randomly placed in non-transparent materials. We have presented two attempts here, both of which are based on data collected from a random planar cross-section passed through space containing three-dimensional nodules. The first attempt uses a Probability Density Function (PDF2) the form of which is experimentally obtained on the basis of a set containing two-dimensional radii (r2). These radii are produced by an intersection of the space by a random plane. In turn, the second solution also uses an experimentally obtained Probability Density Function (PDF1). But the form of PDF1 has been created on the basis of a set containing chord lengths collected from a cross-section. The most important finding presented in this paper is the conclusion that if the PDF1 has proportional scopes, the PDF3 must have a constant value in these scopes. This fact allows stating that there are no nodules in the sample space that have particular radii belonging to the proportional ranges the PDF1.
Źródło:: Journal of Casting & Materials Engineering; 2021, 5, 4; 53--60
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: An Evaluation of Combustion Kinetics for the Synthesis Reaction of the Reinforcing Phase During Casting
Autorzy:: Wiktor, Tomasz
Sobula, Sebastian
Burbelko, Andriy
Ptasznik, Michał
Powiązania:: https://bibliotekanauki.pl/articles/106979.pdf
Data publikacji:: 2020
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: MMC
SHS reaction kinetics
Fourier thermal analysis
computer modelling
Opis:: 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.
Źródło:: Journal of Casting & Materials Engineering; 2020, 4, 2; 23-28
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: New Computer Method of Derivative Thermal Express Analysis of Cast Iron for Operational Prediction of Quality of Melts and Castings
Autorzy:: Zakharchenko, Edvard
Sirenko, Ekaterina
Goncharov, Alexander
Bogdan, Alexander
Burbelko, Andriy
Kawalec, Magdalena
Powiązania:: https://bibliotekanauki.pl/articles/106953.pdf
Data publikacji:: 2019
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: derivative thermal express-analysis
reference and analyzed cooling curve similarity criterion
gray iron
white iron,
immersion sample cup
Opis:: This method is based on the determination of similarity criterion Z as the average temperature difference between the reference and analyzed curves in the solidification region. The purpose of this work is to describe the thermal express-analysis (TDA) device created by us and the substantiation of the reliability and sensitivity of the results of the new method, including the definition of a two-sided confidence interval using Student’s t-test. The error of the method was determined with the Student’s criterion taken into account. The high sensitivity of the method to the metallurgical prehistory of the gray and white cast iron melts was confirmed. The method has been successfully tested under laboratory and experimental-industrial conditions on induction melting cast iron. The new method uses a disposable environmentally friendly submersible steel sampler with a heat-resistant coating inside and out. The method allows for the quick adaptation to the conditions of specific foundries (especially with the frequent changes of classes and types of cast iron) due to replenishing the database of the reference samples. The basic features of the new method are its universality, self-adaptability, speed, relative simplicity, and high sensitivity to the metallurgical prehistory of molten iron.
Źródło:: Journal of Casting & Materials Engineering; 2019, 3, 2; 31-42
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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