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Tytuł:
Preparation and Study of Some Electrical Properties of PVA-Ni(NO3)2 Composites
Autorzy:
Salman, S.A.
Bakr, N. A.
Mahmood, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/411873.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
polyvinyl alcohol
Casting method
Electrical properties
Composites
Opis:
The aim of this paper is to prepare and study the (D.C.) electrical conductivity of (PVA-Ni(NO₃)₂) composites at different temperatures. For that purpose, PVA films with Ni(NO₃)₂ salt additive were prepared with different concentrations 2, 4, 6, 8 and 10 wt. % and with thickness of 45μm by using casting technique. The experimental results for PVA-Ni(NO₃)₂) films show that the (D.C.) electrical conductivity increased with increasing the filler content and the temperature, and the activation energy was decreased with increasing the filler content.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 40; 36-42
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Physical Properties of Copper Oxide Thin Films Prepared by Electrolysis Method
Autorzy:
Oudah, Mustafa H.
Mazin, H. Hasan
Abd, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1065248.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
copper oxide
drop-casting method
electrolysis
quantum size effect
thin films
Opis:
The aim of this paper is to study the properties of copper oxide thin films prepared by electrolysis method and deposited on glass substrates by drop-casting method at different annealing temperatures. Copper oxide colloidal was successfully prepared by electrolysis method. The X-ray diffraction confirms the polycrystalline structure of the films. Atomic force microscopy shows that the increase in the annealing temperature improves the surface morphology, increases the grain size and removes the cracks. The best optical transmittance was for the film annealed at 200 ºC. The bandgap decreases from 3.35 eV to 3.15 eV as a result of increasing the annealing temperature. The wide bandgap that obtained in this study is due to quantum size effect.
Źródło:
World Scientific News; 2019, 135; 59-70
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examining and Modelling the Influence of Thermo-Physical Properties of Liquid Metal and Sand Mould on Solidification Time of Pure Al Castings
Badania i modelowanie wpływu właściwości termofizycznych ciekłego metalu i formy na czas krzepnięcia odlewu Al
Autorzy:
Krajewski, P. K.
Magda, K.
Stojecki, P.
Powiązania:
https://bibliotekanauki.pl/articles/380787.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting mould system
thermophysical properties
thermal conductivity
casting method
układ odlew-forma
właściwości termofizyczne
przewodność cieplna
metoda odlewnicza
Opis:
The paper presents analysis of influence of different variable parameters on time of solidification calculated from analytical solution of the heat exchange in casting-mould system. The analysed variable parameters were: melt overheating, initial mould temperature and ambient temperature; thermo-physical properties of casting (heat of crystallization, specific heat of liquid metal, mass density, temperature of crystallization) as well as thermo-physical properties of the mould material (thermal conductivity, mass density and heat capacity). During the validation experiments the time of solidification of pure Al (99.95%) plate cast into sand mould was measured. Basing on these measurements it was stated that the analytical formulas allow performing the mentioned analysis with enough accuracy. It was also found that complex variability of the molding sand thermal conductivity, especially during the water vaporization, requires analogous analysis by numerical calculations. This allows taking into account corresponding functional dependencies of the variable process parameters. This paper prepared in frame of M.Sc. P.K. Krajewski's PhD work is connected with scientific activity of the "Koło Naukowe Zgarek".
Praca dotyczy analizy wpływu właściwości termofizycznych układu odlew – forma odlewnicza, na przykładzie odlewu płyty z czystego Al (99.95%), odlanego do formy piaskowej. Na podstawie pomiarów czasów krzepnięcia ustalono, iż analityczne zależności z wystarczającą dokładnością umożliwiają przeprowadzenie oceny wpływu zmiennych parametrów procesu (temperatura przegrzania metalu, początkowa temperatura formy, temperatura otoczenia), zmiennych właściwości termofizycznych metalu (ciepło krystalizacji, ciepło właściwe w stanie ciekłym, gęstość masy odlewu, temperatura krystalizacji) oraz zmiennych właściwości termofizycznych formy odlewniczej (gęstość masy, ciepło właściwe i przewodnictwo cieplne) na zmianę czasu krzepnięcia wytypowanego odlewu. Stwierdzono również, iż skomplikowany charakter zmienności współczynnika przewodzenia ciepła masy formierskiej, szczególnie w okresie odparowywania wody, wymaga przeprowadzenia analogicznych analiz za pomocą obliczeń numerycznych, umożliwiających wprowadzenie odpowiednich funkcyjnych zależności ww. zmiennych parametrów procesu. Praca została wykonana w Katedrze Inżynierii Procesów Odlewniczych w ramach pracy doktorskiej mgra inż. Pawła Krajewskiego, doktoranta Wydziału Odlewnictwa, realizującego pracę doktorską obejmującą badania właściwości termofizycznych materiałów stosowanych w odlewnictwie przy współudziale studentów z Koła Naukowego Zgarek, realizujących projekty naukowe pod opieką mgra inż. Pawła Krajewskiego.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 89-94
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of prosthetic elements manufacturing technology on properties and microstructure shaping Co-Cr-Mo alloys
Autorzy:
Augustyn-Nadzieja, Joanna
Szczotok, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1844979.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
Co-Cr-Mo alloys
dental prosthetics
lost wax casting method
selective laser sintering of metal powders (DLMS)
microstructure
hardness
Opis:
The presented publication discusses the test results regarding samples of a prosthetic alloy from the Co-Cr-Mo system. The test samples were obtained by means of two different methods applied in prosthetics laboratories to compare their properties and microstructure. To obtain the samples via the traditional lost wax casting method, the cast alloy Co-Cr-Mo was used, commercially known as Wironit LA. In the case of the modern technique DMLS (Direct Metal Laser Sintering), metallic powder Co-Cr-Mo, called EOS Cobalt Chrome MP1, was used. The samples of both Co-Cr-Mo alloys obtained via the two methods were prepared for metallographic tests; they also underwent microstructural observations with the use of light microscopy (LM) and scanning electron microscopy (SEM), and next they were subjected to hardness tests. The obtained samples demonstrated a dendritic structure. In the samples cast with the lost wax casting method, a segregation of the chemical composition was revealed. The samples obtained by means of the DLMS method were characterized by chemical composition homogeneity. The hardness measurements with the statistical analysis of the measurement results showed a difference between the examined alloys. On the basis of the performed studies, it was stated that the applied methods of manufacturing prosthetic elements make it possible to obtain diversified microstructural and mechanical properties of the alloys. The hardness value significantly affects the subsequent mechanical and finishing treatment of prosthetic elements, such as metal bases of crown caps, bridges, mobile prostheses or other retention elements.
Źródło:
Engineering of Biomaterials; 2020, 23, 156; 24-31
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Tribological and Mechanical Properties of Biodegradable AZ91 Alloy Produced by Cold Chamber High Pressure Casting Method
Autorzy:
Urtekin, Levent
Arslan, Recep
Bozkurt, Fatih
Er, Ümit
Powiązania:
https://bibliotekanauki.pl/articles/2049430.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
die casting
AZ91 magnesium alloy
cold chamber high pressure casting method
mechanical properties of AZ91 magnesium alloy
wear of AZ91 alloy
tribological properties of AZ91 alloy
Opis:
In this study, AZ91 Magnesium alloy is produced by cold chamber high pressure die casting (HPDC) method. Different combinations of the cold chamber HPDC process parameters were selected as; in-mold pressure values of 1000 bar and 1200 bar, the gate speed of 30 m/s and 45 m/s, the casting temperatures of 640°C and 680°C. In addition, the test samples were produced by conventional casting method. Tensile test, hardness test, dry sliding wear test and microstructure analysis of samples were performed. The mechanical properties of the samples produced by the cold chamber HPDC and the conventional casting method were compared. Using these parameters; the casting temperature 680°C, in-mold pressure 1000 bar and the gate speed 30 m/s, the highest tensile strength and the hardness value were obtained. Since the cooling rate in the conventional casting method is slower than that of the cold chamber HPDC method, high mechanical properties are obtained by the formation of a fine-grained structure in the cold chamber HPDC method. In dry sliding wear tests, it was observed that there was a decrease in friction coefficient and less material loss with the increase of hardness values of the sample produced by the cold chamber HPDC method.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 205-216
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected Aspects of Nitrogen Refinement of Silumin 226
Autorzy:
Szymczak, T.
Gumienny, G.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/381492.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
casting processes
pressure casting
silumin
refining
TDA method
procesy odlewnicze
odlewanie ciśnieniowe
rafinacja
Opis:
The work presents the results of the investigations of the effect of the nitrogen (N2) refining time „traf” and the gas output on the course of the crystallization process, the microstructure and the gassing degree of silumin 226 used for pressure casting. The refinement of the examined silumin was performed with the use of a device with a rotating head. The crystallization process was examined by way of thermal analysis and derivative analysis TDA. The performed examinations showed that the prolongation of the N2 refining time causes a significant rise of the temperature of the crystallization end of the silumin, „tL”, as well as a decrease of its gassing degree, „Z”. An increase of the nitrogen output initially causes an increase of the temperature „tL” and a drop of the gassing degree „Z”, which reach their maximal values with the output of 20 dm3/min. Further increase of the output causes a decrease of the value „tL” and an increase of „Z”. The examined technological factors of the refining process did not cause any significant changes in the microstructure of silumin 226.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 99-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected Problems of the Microstructure Evolution During Microalloyed Steel Wire Rod Production Process
Autorzy:
Kwiecień, M.
Graca, P.
Muszka, K.
Majta, J.
Powiązania:
https://bibliotekanauki.pl/articles/351722.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
thermomechanical processing
AAD method
microalloyed steel
Opis:
In the present study, we have discussed the selected problems of microstructure development during the whole manufacturing process, i.e. continuous casting, thermomechanical processing, and cold metal forming of the microalloyed steels wires. In the investigated steels, the microstructure development was controlled by the history of deformation and by the effects of microalloying elements, mostly Nb, Ti, and B. It has been concluded that obtained in the ultrafine grained microalloyed steel wires mechanical properties were first of all resulting from specific structural composition and grain refinement. Additionally, it has been proven that austenite grain refinement, that increases nucleation rate during the austenite-to-ferrite phase transformation, as a result of the thermomechanical processing, are very beneficial from point of view of the final mechanical properties. This problem starts to be very important when the microalloyed steel products are subjected to severe plastic deformation, as it has been shown discussed in the present work for combined processes of wire drawing and wire flattening.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 899-904
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hypoeutectic Silumin to Pressure Die Casting with Vanadium and Tungsten
Autorzy:
Szymczak, T.
Gumienny, G.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/354656.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multicomponent silumins
pressure die casting
DTA method
Opis:
The basic aim of this study is to investigate the effect of vanadium and tungsten on the crystallization process, microstructure and mechanical properties of silumin grade EN-AC 46000. The research involved a derivative thermal analysis DTA of the crystallization process, the metallographic analysis as well as the mechanical properties. The metallographic analysis was carried out on pressure die castings and made in the DTA probe. Vanadium and tungsten were added simultaneously to silumin in amount of approximately 0.1; 0.2; 0.3 and 0.4%. The DTA studies have shown the similar shape of all crystallization curves. It has been shown the additives of vanadium and tungsten in pressure die cast silumin can significantly increase its tensile strength as an well as elongation.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2103-2110
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity of conti-casting process with respect to cooling conditions
Analiza wrażliwości procesu ciągłego odlewania na warunki chłodzenia wlewka
Autorzy:
Mochnacki, B.
Majchrzak, E.
Powiązania:
https://bibliotekanauki.pl/articles/281418.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
continuous casting
solidification process
sensitivity analysis
boundary element method
Opis:
In the first part of this paper mathematical description of heat transfer processes proceeding in the domain of continuous casting is presented. The approach called the second generation modelling is taken into account. In particular, the capacity of a source function in the energy equation is determined by the nucleation and growth laws and the Johnson-Mehl-Avrami-Kolmogorow theory. Next, on the basis of the methods of sensitivity analysis the influence of cooling conditions of the cast slab surface on the course of solidification process is analyzed. At the stage of numerical computations the boundary element method has been used. In the final part of the paper an example of computations is presented.
W pierwszej części pracy przedstawiono opis matematyczny krzepnięcia wlewka ciągłego wytwarzanego z czystego matalu. Do opisu wykorzystano podeście nazywane modelem drugiej generacji. W szczególności, wydajność wewnętrznych źródeł ciepła będąca składnikiem równania energii jest wyznaczana na podstawie praw zarodkowania i wzrostu oraz teorii Johnsona-Mehla-Avrami-Kołomogorowa. Następnie, wykorzystując metodę bezpośrednią analizy wrażliwości, badano wpływ warunków chłodzenia powierzchni wlewka na proces jego krzepnięcia. Na etapie obliczeń numerycznych zastosowano metodę elementów brzegowych. W końcowej części pracy pokazano przykład obliczeń numerycznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2002, 40, 1; 129-147
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of heat flux at a solid-solid intreface
Autorzy:
Rywotycki, M.
Malinowski, Z.
Sołek, K.
Falkus, J.
Miłkowska-Piszczek, K.
Powiązania:
https://bibliotekanauki.pl/articles/356275.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting of steel
heat transfer
inverse method
rolls
Opis:
Determining the boundary conditions of heat transfer in steel manufacturing is a very important issue. The heat transfer effect during contact of two solid bodies occurs in the continuous casting steel process. The temperature fields of solids taking part in heat transfer are described by the Fourier equation. The boundary conditions of heat transfer must be determined to get an accurate solution to the heat conduction equation. The heat flux between the tool and the object processed depends mainly on temperature, pressure and time. It is very difficult and complicated to accomplish direct identification and determination of the boundary conditions in this process. The solution to this problem may be the construction of a process model, performing measurements at a test stand, and using numerical methods. The proposed model must be verified on the basis of parameters which can easily be measured in industrial processes. One of them is temperature, which may be used in inverse methods to determine the heat transfer coefficient. This work presents the methodology for determining the heat flux between two solid bodies staying in contact. It consists of two stages – the experiment and the numerical computation. The problem was solved by using the finite element method (FEM) and a numerical program developed at AGH University of Science and Technology in Krakow. The findings of the conducted research are relationships describing the value of the heat flux versus the contact time and surface temperature.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 79-86
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hypoeutectic Al-Si Alloy Doped with Chromium, Tungsten and Molybdenum Designated for Pressure Die Casting
Autorzy:
Szymczak, T.
Gumienny, G.
Kurowska, B.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/353170.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multicomponent Al-Si alloys
pressure die casting
DTA method
Opis:
Structural modification of hypoeutectic Al-Si alloy EN-AC 46000 alloy influences its microstructure and mechanical properties. In a series of examinations the EN-AC 46000 alloy has been doped with Cr, W and Mo. The study involved the differential thermal analysis (DTA) and the light microscopy structural analysis of the samples cut from pressure die castings and from samples cast into the DTA cup. The DTA and microstructure analyses revealed new phases in the alloy doped with mentioned additives. The strength properties measurements of the alloys doped with Cr, W and Mo showed significant improvement in tensile strength and elongation, while preserving good hardness.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1629-1635
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of advanced additive technology in direct metal laser sintering and precision casting method
Autorzy:
Robl, J.
Sedlák, J.
Pokorný, Z.
Ňuksa, P.
Barényi, I.
Majerík, J.
Powiązania:
https://bibliotekanauki.pl/articles/201048.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
test sample
additive technology
DMLS method
precision casting
Inconel 718
Opis:
The paper deals with analysis of samples made of Inconel 718 nickel superalloy, produced using direct metal laser sintering (DMLS), known as “sintering”, and precision casting technologies. The theoretical part is focused on the characteristics of producing samples of the nickel superalloy by modern additive methods (those for processing metallic materials) and by the conventional technology of precision casting. The practical part involves the investigation of the mechanical properties and texture of the surfaces of the tested samples. A significant part of this study is devoted to analysis of fracture surfaces and EDX experimental testing of TEM lamella by using of electron microscopy methods. The conclusions of this paper include a discussion, evaluation and explanation of both technologies applied on tested samples. Finally, the main benefits of using modern additive technologies in the design and production of heat-resistant components of turbochargers are discussed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 109-118
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Intensive Cooling of Alloy AZ91 with a Chromium Addition on the Microstructure and Mechanical Properties of the Casting
Autorzy:
Rapiejko, C.
Pisarek, B.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/355609.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
investment casting technology
magnesium alloys
crystallization
TDA method
intensive cooling
Opis:
The work presents the results of the investigations of the effect of intensive cooling of alloy AZ91 with an addition of chromium on the microstructure and mechanical properties of the obtained casts. The experimental castings were made in ceramic moulds preliminarily heated to 180°C, into which alloy AZ91 with the addition was poured. Within the implementation of the research, a comparison was made of the microstructure and mechanical properties of the castings obtained in ceramic moulds cooled at room temperature and the ones intensively cooled in a cooling liquid. The kinetics and dynamics as well as the thermal effects recorded by the TDA method were compared. Metallographic tests were performed with the use of an optical microscope and the strength properties of the obtained castings were examined: UTS (Rm), elongation (A%), and HB hardness.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2199-2203
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary Study of Frequency-Variable Vibration Packing Fabrication for Atomized Metallic Particulate Fuel Using Surrogate Spherical Powder
Autorzy:
Kim, Ki-Hwan
Ha, Seong-Jun
Park, Sang-Gyu
Kuk, Seoung-Woo
Park, Jeong-Yong
Powiązania:
https://bibliotekanauki.pl/articles/2049120.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
atomized powder
injection casting
metallic particulate fuel
alternative fabrication method
vibration packing
Opis:
An alternative fabrication method for metallic fuel in Gen-IV reactor was introduced with vibration packing of nuclear fuel particles to facilitate remote fabrication in a hot cell and reduce the generation of long-lived radioactive wastes. Vibration packing experiments on metallic particulate fuel using a surrogate 316L stainless steel powder were done to investigate the packing density and the uniformity of the simulated fuel according to the filling method and the vibration condition. Metallic particulate fuel filled with a pre-mixed power over all particles had the highest packing fraction and the most uniform distribution among the filling methods. The vibration packing method showed that it could fabricate the metallic particulate fuel having uniform distribution of spherical fuel particles through the adjustment of the filling method of the metallic powder and the vibration condition of the metallic particulate fuel.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1043-1047
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ATD and DSC Analysis of IN-713C and ZhS6U-VI Superalloys
Autorzy:
Binczyk, F.
Cwajna, J.
Gradoń, P.
Powiązania:
https://bibliotekanauki.pl/articles/381895.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting materials
innovative casting technologies
Nickel superalloys
ATD method
DSC method
solidification parameters
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
stopy niklu
metoda ATD
metoda DSC
parametry krzepnięcia
Opis:
Paper presents the results of ATD and DSC analysis of two superalloys used in casting of aircraft engine parts. The main aim of the research was to obtain the solidification parameters, especially Tsol and Tliq, knowledge of which is important for proper selection of casting and heat treatment parameters. Assessment of the metallurgical quality (presence of impurities) of the feed ingots is also a very important step in production of castings. It was found that some of the feed ingots delivered by the superalloy producers are contaminated by oxides located in shrinkage defects. The ATD analysis allows for quite precise interpretation of first stages of solidification at which solid phases with low values of latent heat of solidification are formed from the liquid. Using DSC analysis it is possible to measure precisely the heat values accompanying the phase changes during cooling and heating which, with knowledge of phase composition, permits to calculate the enthalpy of formation of specific phases like γ or γ′.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 13-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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