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    Wyświetlanie 1-15 z 15
    Tytuł:
    Identification of the heat source and thermal material model parameters for the laser engineered net shaping
    Autorzy:
    Hajder, Lucyna
    Zhang, Tao
    Nguyen, Vu
    Powiązania:
    https://bibliotekanauki.pl/articles/29520077.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    additive manufacturing
    finite element analysis
    heat source model
    thermal analysis
    Opis:
    The research’s primary goal is to identify the heat source and thermal material model parameters for the numerical simulation of the laser engineered net shaping (LENS). Inconel 718 was selected as a case study for the current investigation. The LENS process’s numerical model was developed within commercial finite element software and was used as a direct problem model during the parameter identification stage. Experimental data were obtained based on a rectangular-shaped sample with thermocouples located under the based material surface. The recorded thermal profiles were used to establish a goal function for the parameter identification stage. As a result, parameters describing the melt pool geometry during the additive manufacturing, as well as thermal coefficients describing interactions between the sample material and surrounding/base material, were determined.
    Źródło:
    Computer Methods in Materials Science; 2022, 22, 1; 43-54
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Novel Measurement Method to Study Thermal Aspects of Molding Mixture Decomposition
    Autorzy:
    Svidró, J. T.
    Diószegi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/106991.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cold-box
    epoxy resin
    greensand
    molding mixture
    thermal analysis
    Opis:
    A wide variety of molding mixtures are extensively used in the process of the sand casting of metal components today. The sector is continuously developing in production volume; moreover, the expectations of customers are increasing on a monthly basis (also from a quality point of view). Even though mold and core manufacturing are well-organized routines in most foundries, technological problems still appear that can lead to technological problems and casting defects. These trends are forcing metal casters to come up with fitting strategies to solve their daily production challenges, while their suppliers are expected to keep up the continuous development of their existing foundry products and to find innovative solutions as well as new material combinations. Research on molding materials and their properties must, therefore, take a step forward accordingly to generate the necessary new knowledge to understand the behavior of mold and core mixtures during casting. This paper summarizes the latest results of a novel measurement method suitable for studying the degradation characteristics of different molding materials from a new perspective. The fundamentals of the method are based on a thermal analysis, focusing on the heat-absorption behavior of greensand and two types of chemically bonded sands regardless of the binder type and amount or the manufacturing process.
    Źródło:
    Journal of Casting & Materials Engineering; 2018, 2, 3; 63-66
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Optimization of a Numerical Steel Foundry Simulation Through a Characterization of the Thermal Properties of the Materials
    Autorzy:
    Souêtre, Morgan
    Vaucheret, Alexis
    Jacquet, Philippe
    Carton, Jean-François
    Powiązania:
    https://bibliotekanauki.pl/articles/2172386.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    foundry simulation
    low-alloyed steel
    green sand
    thermal analysis
    CALPHAD
    Opis:
    In many foundries, numerical simulation is used to determine the origins of different defects as this tool allows the acceleration of the design process. However, the databases provided by different software do not seem to tally with the actual properties of the material. In fact, every foundry uses a different grade of steel and varying mixtures of sand. An evaluation of the impact of different material properties showed the importance of measuring every physical property to improve the database of the software. Following this, an experiment was conducted to evaluate the gap between numerical simulations and the results obtained through experimentation. This experiment, called thermal analysis, consists in measuring the solidification and cooling of a cylinder filled with liquid steel. After the calculation of the steel properties and a simulation with real experimental parameters, a comparison between each cooling curve was realized. This comparison shows that the calculated properties provide a simulated cooling curve which is closer to the experimental curve than the properties in the original database. We did not explore all of the metal properties in this study, but the modification of the sand properties was explored, together with the thermal conductivity of the steel and sand. These other measurements will be obtained in a future study.
    Źródło:
    Journal of Casting & Materials Engineering; 2022, 6, 4; 76--80
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Cooling Curves of Nodular Cast Iron
    Autorzy:
    Bartošová, M.
    Pribulová, A.
    Eperješi, Š.
    Futáš, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/106981.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cooling curve
    nodular cast iron
    eutectic transformation
    thermal analysis
    metallurgical quality
    Opis:
    The solidification of cast iron is a complex process with characterized entrance and marginal conditions. Thermal analysis is one of the processes that allows us to observe the solidification of alloys. There is a possibility of gaining information about the melted cast iron quality and predicting the final properties of the cast by evaluating the scanned cooling curves by solidification (stable and metastable system). This article deals with the study and analysis of cooling curves taken from production conditions of a foundry during ductile cast iron production. The aim is to discover the reproduction and reliability of the thermal analysis results of cast iron. The study of the progress of the cooling curves and their first derivation to follow the reactions of the curves to changing factors in the production process.
    Źródło:
    Journal of Casting & Materials Engineering; 2018, 2, 1; 1-4
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TG-DTG-DSC, FTIR, DRIFT, and Py-GC-MS Studies of Thermal Decomposition for Poly(sodium acrylate)/Dextrin (PAANa/D) – New Binder BioCo3
    Autorzy:
    Grabowska, B.
    Kaczmarska, K.
    Bobrowski, A.
    Żymankowska-Kumon, S.
    Kurleto-Kozioł, Ż.
    Powiązania:
    https://bibliotekanauki.pl/articles/106999.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    polymer binders
    foundry sands
    thermal analysis
    TG-DTG-DSC
    FTIR
    Py-GC-MS
    thermal degradation
    Opis:
    TG-DTG-DSC, FTIR, DRIFT, and Py-GC-MS studies have been conducted to determine the effect of the thermal decomposition conditions and structure of foundry binder BioCo3 in the form of a composition poly(sodium acrylate)/dextrin (PAANa/D) on the progress of degradation in terms of processes occurring in foundry sands in contact with liquid metal. TG-DTG-DSC curves of the composition allowed us to determine the temperature range in which they do not undergo degradation, by which they do not lose their binding properties. With temperature increasing, physical and chemical changes occur that are related to the evaporation of solvent water (20–110°C), followed by the release of constitution water, and finally intermolecular dehydration (110–230°C). In this temperature range, processes that are mainly reversible take place. Within a temperature range of 450–826°C, polymer chains are decomposed, including the decomposition of side chains. Within a temperature range of 399–663°C, polymer composition decomposition can be observed (FTIR, DRIFT), and gas products are generated from this destruction (Py-GC-MS).
    Źródło:
    Journal of Casting & Materials Engineering; 2017, 1, 1; 27-32
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Possibilities in Thermal Analysis of Molding Materials
    Autorzy:
    Svidró, J.
    Diószegi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/107009.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    casting
    foundry sand
    Fourier thermal analysis
    heat absorption
    molding material
    silica sand
    Opis:
    Molding material-related studies within the research activities concerning foundry technology have always been limited despite the significant effect of molding mixtures on the quality of cast parts. One reason behind this trend is the difficulty in interpreting the results of such complex systems like molds and cores. This paper provides a new possibility for studying the heat-absorption performance of materials used as molding media in metal casting processes. By further developing the Fourier thermal analysis method of cores and molds introduced by earlier studies, the investigation of unbonded sand has become available. The heat-absorption properties of the components can be hereby separated and studied respectively. Thermal analyses were performed on sphere-shaped resin-bonded cores with various binder levels as well as on unbonded sand samples. The temperature data collected from two points of the samples were then used for the calculation of the novel thermophysical properties. The results revealed not only quantitative but qualitative differences in the characteristics of the binder decomposition processes, providing a deeper understanding on the thermal behavior of molding materials. The outcome of the research provides more accurate data, which is the key for the improved simulation of casting processes.
    Źródło:
    Journal of Casting & Materials Engineering; 2018, 2, 4; 67-70
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alunogen from the sulfate efflorescence of the Stone Town Nature Reserve in Ciężkowice (the Outer Carpathian Mountains, Poland)
    Autorzy:
    Marszałek, Mariola
    Gaweł, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/27310118.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    sulfate efflorescence
    alunogen
    thermal analysis
    Raman spectroscopy
    unit-cell parameters
    the Carpathian Mountains
    Polska
    Opis:
    Alunogen (Al2(SO4)3∙17H2O), a rare secondary mineral, has been found in the efflorescence on sandstones from the Stone Town Nature Reserve in Ciężkowice, southeastern Poland. This is probably the first find of this salt on such rocks in Poland. Alunogen forms in various geological environments, but mainly from the oxidation of pyrite and other metal sulfides in ore deposits and Al-rich Earth materials under low-pH conditions. Its crystallization at this particular site depends on a set of necessary physicochemical (pH, concentration), climatic (season, temperature, humidity), site-related (location and protection of efflorescence), and mineralogical (the presence of pyrite) conditions. This paper presents the mineralogical and geochemical characteristics of the alunogen from the Stone Town Nature Reserve (based on SEM-EDS, XRPD, EPMA and Raman spectroscopy methods) as well as of the efflorescence itself (based on XRPD and STA coupled with QMS and FTIR for the analysis of gas products). Crystals of alunogen take the shape of flakes, often with a hexagonal outline, clustered in aggregates forming a cellular network. Its calculated formula is (Al1.96Fe3+ 0.01)∑1.97(SO4)3∙17H2O (based on 12 O and 17 H2O). The unit-cell parameters refined for the triclinic space group P1 are: a = 7.423 (1) Å, b = 26.913 (5) Å, c = 6.056 (1) Å, α = 89.974 (23)°, β = 97.560 (25)°, γ = 91.910 (22)°. The Raman spectra (SO4) bands are: intensive 995 cm−1 (ν1); low-intensive 1069, 1093 and 1127 cm−1 (ν3); low-intensive 419 and 443; medium-intensive 470 cm−1 (ν2); and medium-intensive 616 cm−1 (ν4). Those at 530, 312 and at 338 cm−1 are assigned to water vibrations and those at 135, 156, 180 cm−1 to the lattice modes. Although the efflorescence contained an admixture of other minerals (pickeringite, gypsum and quartz), the predominant alunogen is almost chemically pure and the above parameters are consistent with the values reported in the literature for alunogen from different locations and of various origins.
    Źródło:
    Geology, Geophysics and Environment; 2023, 49, 2; 139--156
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal degradation of waste polyolefines and their application in blast-furnace process
    Termiczna degradacja odpadowych poliolefin i ich zastosowanie w procesie wielkopiecowym
    Autorzy:
    Kuźnia, M.
    Magdziarz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/264092.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    wielki piec
    współspalanie
    analiza termiczna
    odpady poliolefinowe
    blast furnace
    co-combustion
    thermal analysis
    waste polyolefines
    Opis:
    Nowadays about 60% of world production and consumption of plastics are polyolefines. They are used as packaging, in building engineering, automotive industry or electronic engineering. High calorific value and proper Chemical composition of polyolefines (based on carbon and hydrogen) make them ideal for use in a wide range of applications. The polyolefines can be used as a substitute for coke in blast-furnace processes. This paper outlines thermal decomposition of PE-LD, PE-HD, PP which are used in agriculture and packaging from household. Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) were used as analytical methods.
    Obecnie około 60% światowej produkcji i konsumpcji tworzyw sztucznych stanowią poliolefiny. Znajdują one zastosowanie w produkcji opakowań, w budownictwie, w przemyśle samochodowym oraz przemyśle elektronicznym. Wysoka wartość opałowa oraz skład chemiczny poliolefin (oparty na węglu i wodorze) sprawiają, że po wykorzystaniu mogą być stosowane w szerokim zakresie. Poliolefiny mogą być stosowane m.in. jako substytut koksu w procesie wielkopiecowym. Artykuł przedstawia rozkład termiczny PE-LD, PE-HD oraz PP pochodzących z rolnictwa, opakowalnictwa i z gospodarstwa domowego. Jako metody analityczne zastosowano: termograwimetrię (TG) i różnicową kalorymetrię skaningową (DSC).
    Źródło:
    Metallurgy and Foundry Engineering; 2006, 32, 2; 117-123
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-temperature corrosion resistance of steel-matrix composites
    Wysokotemperaturowa odporność korozyjna kompozytów stalowych
    Autorzy:
    Sulima, I.
    Homa, M.
    Malczewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/263901.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    composite
    austenic stainless steel
    Differential Thermal Analysis (DNA)
    Thermogravimetric Analysis (TG)
    kompozyt
    stal austenityczna
    termiczna analiza różnicowa (DTA)
    termograwimetria TG
    Opis:
    The results of corrosion studies of composite materials obtained by two methods of powder metallurgy are presented in the article. The main goal of the studies was to determine the high-temperature corrosion resistance of steel-matrix composites reinforced with 8 vol.% TiB2. Thermogravimetric analyses were conducted at 1100°C in air during a 24 h cycle. The microstructure of the composite after thermogravimetric studies was observed with a scanning electron microscope.
    Praca prezentuje wyniki badań korozyjnych materiałów kompozytowych otrzymanych dwoma metodami metalurgii proszków (PM). Głównym celem pracy było określenie wysokotemperaturowej odporności korozyjnej kompozytów o osnowie stali austenitycznej umacnianych 8% obj. TiB2 . Przeprowadzono badania termograwimetryczne w temperaturze 1100°C w atmosferze powietrza w cyklu 24-godzinnym. Mikrostrukturę powierzchni kompozytów po badaniach termograwime- trycznych obserwowano przy użyciu skaningowej mikroskopii elektronowej
    Źródło:
    Metallurgy and Foundry Engineering; 2015, 41, 2; 71-84
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Określanie właściwości popiołów lotnych przy użyciu różnych metod i urządzeń badawczych
    Determination of fly ashes properties with use of different research methods and measuring devices
    Autorzy:
    Szponder, D. K.
    Trybalski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/349933.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    popiół lotny
    analiza densymetryczna
    pomiar powierzchni właściwej
    analiza granulometryczna
    rentgenowska analiza dyfrakcyjna
    mikroskopia skaningowa
    mikroanaliza rentgenowska
    analiza termiczna
    fly ash
    density measurement
    specific surface measurements
    grain size analysis
    X-ray diffraction analysis
    scanning microscopy
    X-ray microanalysis
    thermal analysis
    Opis:
    Popioły lotne są uciążliwymi odpadami, powstającymi z substancji mineralnych zdyspergowanych w węglu, które w wyniku jego spalenia ulegają wielu procesom fizykochemicznym. Ze względu na zastosowanie różnych metod spalania węgla, różnorodnego składu paliwa, wysoki stopień dyspersji substancji mineralnych paliwa oraz gwałtowność procesów termicznych, ziarna popiołu wykazują wysoki stopień zróżnicowania morfologicznego, składu fazowego i chemicznego. Sprawia to, że poszczególne rodzaje popiołów lotnych znacznie różnią się właściwościami, dlatego też dobór odpowiedniej metody ich utylizacji wymaga dogłębnego poznania ich właściwości fizyko-chemicznych i mineralogicznych. W publikacji zaprezentowano wybrane metody i urządzenia pomiarowe wykorzystywane do określania właściwości fizycznych surowców i odpadów mineralnych, a także ukazano możliwości ich zastosowania do scharakteryzowania właściwości popiołów lotnych.
    Fly ash is noxious waste that comes from minerals substances dispersed in coal and are subjected to many physical and chemical processes during coal combustion. Because of different types of coals, different types of combustion, a high level of dispersion of mineral substances in coals and the duration of thermal processes, the particles of fly ash are diversified as to their structure, phase and chemical composition. The diversity of produced fly ash makes it necessary to determinate their physical, chemical and mineralogical properties in order to select suitable utilization method. This paper presents a few research methods and measuring devices used to determine physical, chemical and mineralogical properties of raw and waste materials and also their usefulness to characterize fly ashes properties.
    Źródło:
    Górnictwo i Geoinżynieria; 2009, 33, 4; 287-298
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of microstructure and phase transformations of Fe71.25Si9.5B14.25In5 alloy
    Badania mikrostruktury i przemian fazowych w stopie Fe71,25Si9,5B14,25In5
    Autorzy:
    Wojciechowska, M.
    Ziewiec, K.
    Ferenc, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264182.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    amorphous/crystalline composites
    mid wave infrared camera
    scanning electron microscope (SEM)
    differential thermal analysis (DTA)
    kompozyt amorficzno-krystaliczny
    kamera termowizyjna średniej podczerwieni
    skaningowa mikroskopia elektronowa (SEM)
    termiczna analiza różnicowa (DTA)
    Opis:
    The aim of this work was to study the microstructure and high-temperature phase transformations of the Fe71.25Si9.5B14.25In5 alloy. The alloy was remelted in a resistance furnace, and a sequence of melting and crystallization at a range of high temperatures was observed using a mid-wave infrared MWIR camera. The alloy was also investigated by differential thermal analysis (DTA). The microstructure of the alloy was studied using a scanning electron microscope SEM with an energy dispersive spectrometer (EDS). The results show that there is a clear partition into two liquids in the studied alloy. The ingot microstructure presents very strong segregation into the eutectic regions enriched in the Fe-Si-B and In-rich regions.
    Celem pracy było zbadanie mikrostruktury oraz wysokotemperaturowych przemian fazowych zachodzących w stopie Fe71,25Si9,5B14,25In5. Proces przetapiania oraz krystalizacji stopu w piecu oporowym został zarejestrowany za pomocą kamery termowizyjnej pracującej w zakresie średniofalowej podczerwieni. Wykonano również różnicową analizę termiczną DTA badanego stopu. Mikrostrukturę zbadano przy użyciu skaningowego mikroskopu elektronowego SEM wyposażonego w spektrometr energii rozproszonej EDS. Wyniki wykazują, że w badanym stopie zachodzi wyraźny podział na dwie ciecze. Mikrostruktura wlewka zawiera składnik eutektyczny bogaty w Fe, Si i B oraz fazę wzbogaconą w In.
    Źródło:
    Metallurgy and Foundry Engineering; 2017, 43, 1; 67-72
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Importance of TDA Thermal Analysis in an Automated Metallurgical Process
    Autorzy:
    Petrus, Łukasz
    Bulanowski, Andrzej
    Kołakowski, Jakub
    Sobieraj, Jakub
    Paruch, Tomasz
    Urbanowicz, Mariusz
    Brzeżański, Mateusz
    Burdzy, Daniel
    Zych, Jerzy
    Janerka, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2056035.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    ductile iron
    grey cast iron
    thermal derivative analysis
    melting automation
    modification
    żeliwo sferoidalne
    żeliwo szare
    termiczna analiza pochodnych
    automatyzacja topienia
    modyfikacja
    Opis:
    The article presents the results of research and work related to the implementation of the research and development project POIR.01.01.01-00-0120/17 co-financed by the EU, through the NCBR, entitled: Innovative technology using thermal analysis, TDA, of self-feeding manufacturing of high-quality cast iron to produce new generation, enhanced performance casts. In many foundries, thermal derivative analysis (TDA) is used in addition to chemical analysis to evaluate the physical and chemical properties of an alloy while it is still in the melting furnace or ladle and before it is poured into the mold. This fact makes it possible to improve the metallurgical quality of the alloy by introducing alloying additives, carburizers or modifiers into the furnace as part of the pre-modification or primary or secondary modification in the ladle or when pouring into molds. Foundry machinery (modifier dosing systems and spheroidizing station) is very important in these operations. Only the full synergy of modern equipment with modern technology ensures high quality and repeatability of the casting process. The article mainly discusses the obtained parameters of TDA analysis (with the use of the ITACA system) at different stages of melting and how to improve them by using modern and fully automated dosing systems (Itaca OptiDose, ItacaWire and ItacaStream). Special attention was paid to the minimum temperature of the eutectoid. The change of its value after the modification process, its influence on the quality of the melted metal, a very strong correlation with the number of nuclei and the number of graphite precipitations in the casts were shown.
    Źródło:
    Journal of Casting & Materials Engineering; 2021, 5, 4; 89--93
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An accuracy analysis of the cascaded lattice Boltzmann method for the 1D advection-diffusion equation
    Autorzy:
    Straka, Robert
    Sharma, Keerti V.
    Powiązania:
    https://bibliotekanauki.pl/articles/29520238.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    cascaded thermal lattice Boltzmann method
    high order analysis
    advection-diffusion equation
    equivalent finite difference equation
    Opis:
    We analyze higher order error terms in a modified partial differential equation of a cascaded lattice Boltzmann method (CLBM) for one conservation law – the advection-diffusion equation. To inspect the behavior of the error terms we derived an equivalent finite difference equation (EFDE), this approach is different from other techniques like the Chapman-Engskog expansion, equivalent partial differential equations or the Maxwell iteration used in the literature. The resulting EFDE is obtained from the recurrence formulas of the lattice Boltzmann equations for the CLBM and is subsequently analyzed by standard analytical techniques. We have found relations of the LBM parameters which could cancel some of the higher order terms, making the method more accurate. The detailed derivation of the EFDE and higher order terms’ pre-factors is the main result of this paper. The resulting explicit form of the error terms are derived and presented.
    Źródło:
    Computer Methods in Materials Science; 2020, 20, 4; 173-184
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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