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Wyświetlanie 1-15 z 47
Tytuł:
Methods for Preparing Spheroidal Particles of 3-Nitro- 1,2,4-triazol-5-one (NTO)
Autorzy:
Lasota, J.
Chyłek, Z.
Trzciński, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/358248.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
NTO
recrystallization
properties
Opis:
This paper presents an overview of methods for recrystallizing 3-nitro- 1,2,4-triazol-5-one (NTO), with particular emphasis on methods for obtaining spheroidal particles with low porosity. The effects of selected solvents and surfactants on the recrystallization results was checked. Products in the form of spheroidal particles were obtained for some selected solvent-surfactant systems. The bulk density, surface area, size distribution, and sensitivity to friction and impact were tested for the spherical NTO samples and thermal analysis was also performed.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 4; 769-783
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
RCAFE Based Numerical Model of Dynamic Recrystallization
Autorzy:
Legwand, A.
Sitko, M.
Perzyński, K.
Madej, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/100012.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
cellular automata
RCAFE
recrystallization
Opis:
The main goal of the paper is dedicated to proper arrangement of the Finite Element (FE) and Random Cellular Automata (RCA) methods in order to develop numerical model of dynamic recrystallization (DRX) and therefore to simulate microstructure morphology changes during plastic deformation at elevated temperatures. In the approach, Finite Element solver provides information on equivalent stress and strain fields after subsequent time steps. Then these data are transferred to RCA model, which is responsible for evaluation of corresponding microstructure morphology evolution and dislocation density changes. Finally, information from the CA part is send back to the FE solver as an input for the next time step. As a result, a fully coupled RCAFE model to simulate progress of DRX is established. The present paper is directly focused on development of algorithms and methods to transfer input/output data between both FE and RCA models. The developed communication protocol is based on the Abaqus VUMAT subroutine. Examples of obtained results from the developed model are also presented to highlight its potential.
Źródło:
Journal of Machine Engineering; 2016, 16, 2; 52-60
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Stability of AA1050 Aluminum Alloy after Equal Channel Angular Pressing
Autorzy:
Koprowski, P.
Bogucki, R.
Bieda, M.
Kawałko, J.
Sztwiertnia, K.
Powiązania:
https://bibliotekanauki.pl/articles/356187.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ECAP
hardness
EBSD
texture
recrystallization
Opis:
The annealing behavior of AA1050 aluminum alloy deformed by equal-channel angular pressing (ECAP) was studied experimentally. The material was subjected to extrusion through die with channels intersecting at an 90° angle. Samples were pressed for up to 8 passes using route BC, then cut into slices and subsequently annealed for 1 hour at temperatures from 100°C to 350°C. Hardness measurements were performed on each slice. Microstructure of material was analyzed in the longitudinal section by means of Electron Backscatter Diffraction system in a scanning electron microscope (EBSD/SEM). From the obtained sets of Kikuchi diffraction patterns orientation maps and Image Quality maps were determined. Grain size, disorientation distributions and crystallographic texture were also estimated. ECAP caused significant improvement of hardness, with stabilization after 4 passes. Refinement of microstructure was obtained with the increasing amount of passes. Material properties were stable during annealing at temperatures lower than 150°C. Annealing at higher temperatures caused a decrease in hardness corresponding to an increase of the grain size.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 777-786
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
57Fe Mössbauer spectroscopy of annealed metamict davidite
Autorzy:
Malczewski, D.
Frąckowiak, J.
Galuskin, E.
Powiązania:
https://bibliotekanauki.pl/articles/148337.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
davidite
metamict minerals
recrystallization
Mössbauer spectroscopy
Opis:
This paper reports preliminary results of 57Fe Mössbauer spectroscopy and X-ray diffraction (XRD) studies of metamict davidite samples (La,Ce,Ca,Th)(Y,U,Fe)(Ti,Fe,Mn)20(O,OH)38 after high temperature annealing in an argon atmosphere. The Mössbauer spectra show a gradual decrease of quadrupole splitting and line width values of an Fe3+ doublet with increasing annealing temperature. Rather unexpected feature of these spectra for an Fe2+ doublet is a considerable increase of the line width with progressive crystallinity and a simultaneous decrease of both quadrupole splitting and isomer shift values. Changes of the hyperfine parameters as a function of the annealing temperature appeared as sensitive indicators of the thermal recrystallization process of metamict davidite similar to metamict silicates.
Źródło:
Nukleonika; 2007, 52, supl. 1; 81-84
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friction Weldability of UFG 316L Stainless Steel
Autorzy:
Skowrońska, B.
Chmielewski, T.
Pachla, W.
Kulczyk, M.
Skiba, J.
Presz, W.
Powiązania:
https://bibliotekanauki.pl/articles/355538.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
UFG metals
recrystallization
friction welding
weldability
Opis:
The broad range applications of Ultra-Fine Grained metals is substantially limited by the lack of a welding method that allows them to be joined without losing the strong refinement of structure. From this point of view, the solid state welding processes are privileged. Friction welding tests were carried out on UFG 316L stainless steel. A joining process at high temperature activates the recrystallization, therefore the friction welding parameters were selected according to the criterion of the lowest degree of weakness due to recrystallization in the heat affected zone. In order to characterize the structure of basic material and selected areas of the obtained joint, were performed SEM, TEM and metallographic examinations in terms of hardness and range of softening of the material and tensile test. Despite the short time and relatively low welding temperature, results of the test by scanning electron microscopy and transmission electron microscopy confirmed the loss of the primary ultrafine structure in the Heat Affected Zone of welded joint.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1051-1058
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical Approach to Determining Dynamic Recrystallization Parameters Using Finite Element Optimization of Backward Extrusion Process
Autorzy:
Irani, Missam
Joun, Mansoo
Powiązania:
https://bibliotekanauki.pl/articles/352583.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dynamic recrystallization
grain size
optimization
simulation
Opis:
In this study, we present a new method for obtaining the parameters of the Johnson-Mehl-Avrami-Kolmogorov equation for dynamic recrystallization grain size. The method consists of finite-element analysis and optimization techniques. An optimization tool iteratively minimizes the error between experimental values and corresponding finite-element solutions. Isothermal backward extrusion of the AA6060 aluminum alloy was used to acquire the main parameters of the equation for predicting DRX grain size. We compared grain sizes predicted using optimized and reference parameters with experimental values from the literature and found better agreement when the optimized parameters were applied.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1175-1182
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results of 57Fe Mössbauer spectroscopy of metamict samarskite after one-hour high temperature annealing in argon
Autorzy:
Malczewski, D.
Grabias, A.
Powiązania:
https://bibliotekanauki.pl/articles/146552.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
samarskite
metamict minerals
Mössbauer spectroscopy
recrystallization
Opis:
The preliminary results of 57Fe Mössbauer spectroscopy and X-ray diffraction (XRD) of fully metamict samarskite dated at ~1500 Ma, which absorbed -dose of 6.5 × 1017 α-decay mg–1, are reported after one-hour annealing at 673, 873, 1173 and 1373 K in argon atmosphere. Metamict minerals contain radioactive elements that degrade their crystal structures over geological time. All the Mössbauer spectra obtained can be fitted to two quadrupole doublets assigned to Fe2+ and Fe3+ in octahedral positions. The relative contribution of Fe2+ (Fe2+/Fe) reaches a minimum of 0.10 at 1173 K.
Źródło:
Nukleonika; 2017, 62, 2; 141-144
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skały impaktowe struktury Puczeż-Katunki, platforma wschodnio-europejska, Rosja
Impact rokcs from the Puchezh-Katunki structure, East-European Platform, Russia
Autorzy:
Kosina, Romuald
Powiązania:
https://bibliotekanauki.pl/articles/1033127.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
PDFs
astrobleme
impactites
quartz recrystallization
secondary minerals
Opis:
The complex Puchezh-Katunki (PK) structure was created in the area of the Vladimir-Vyatka dislocation zone on the crystalline basement of the East European platform. The crater ca 80 km in diameter is located north of the city Nizhny Novgorod and is covered by thick layers of Mesozoic sediments. Shocked rocks, mainly gneisses, have been described. Recrystallised feldspar-quartz melt is the most common component in specimens of impactites. The melt is preserved in the form of various clasts showing wavy nebulous contacts within the surrounding microcristalline or isotropic matrix. Planar deformation features (PDFs) were observed in the quartz grains, including toasted quartz. Their number ranges from one to three. The PDF lines are limited to the grain boundaries or cross them. A few ‘kinky’ cracks have been noted in the biotite plates. Lobate inter-grain contacts prove that quartz is recrystallised by grain-boundary migration. The recrystallized quartz also occurs in the form of ballen quartz and trydimite. Both types of quartz are numerous in the material under study. Tridymite tiles show patchy extinction. Various matrices formed from rock melts are microcrystalline (clay minerals) and contain fragments of isotropic glass, also in the form of spherules. In matrix, some clasts are in the form of the ballen quartz, sometimes with relics of PDFs. Matrices of recrystallized rock melts are characterised by different colours, number of clasts and are distinctly separated from each other. The melts during the impact process are immiscible. Secondary mineralization is more frequent in the rock melts and less frequent in the metamorphosed gneisses. Magnetite, pyrite and zeolites are the most common secondary minerals.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2019, 10; 74-91
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent Trends in Metal Forming: From Process Simulation and Microstructure Control In Classical Forming Processes to Hybrid Combinations Between Forming and Additive Manufacturing
Autorzy:
Bambach, M.
Powiązania:
https://bibliotekanauki.pl/articles/99829.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
metal forming
additive manufacturing
microstructure model
recrystallization
Opis:
This paper describes some recent trends in metal forming such as isothermal forging of titanium aluminides and process combinations between metal forming and additive manufacturing. These trends rely on accurate process and material models for process design. Process and material models must hence be able to track the microstructure evolution in complex materials such as titanium aluminides as well as predict the microstructure evolution along process histories with multiple deformation and/or heat input steps. In models for such processes, JMAK-type kinetics for and phase transformation are still common. For processes involving deformation and heat, the accuracy, consistency and limits of JMAK-type models are discussed. It is shown that the consistency of DRX models as well as the stability of model predictions in multi-stage processes require further attention.
Źródło:
Journal of Machine Engineering; 2016, 16, 2; 5-17
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes simulations with multiscale materials models using a dedicated interface
Autorzy:
Smyk, Grzegorz
Szeliga, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/29520085.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multiscale modelling
material models
model integration
recrystallization
Opis:
The main goal of this work is the integration of in-house software with commercial numerical software based on the finite element method (FEM). The main idea is to develop a universal interface to perform process simulations with multiscale models. The interface allows the combination of external procedures with commercial software with minimum programmer’s work putting in integration. As an example, the model of material recrystallization of steel was implemented, added to the commercial application, and the software was tested for a process defined as a sequence of compression and cooling. The material model takes into consideration each type of recrystallization that occurs during a sequence of thermal and mechanical processing such as static recrystallization (SRX), dynamic recrystallization (DRX), and meta-dynamic recrystallization (MDRX). It allows the prediction of recrystallized volume fraction (X) and grain growth on each step of numerical simulation for each Gauss point in the computation domain. The presented multiscale model of process sequences not only allows to calculate microscale model parameters such as grain growth and recrystallized volume fraction, but also reflects the impact of the microscale model on macroscale parameters.
Źródło:
Computer Methods in Materials Science; 2021, 21, 4; 181-192
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of die forging parameters on the microstructure and phase composition of Inconel 718 alloy
Wpływ warunków kucia matrycowego na mikrostrukturę oraz skład fazowy stopu Inconel 718
Autorzy:
Bunsch, A.
Kowalska, J.
Witkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/355862.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Inconel 718
microstructure
texture
phase analysis
recrystallization
Opis:
The object of the present investigation was Inconel 718 alloy. The material in the initial state and after forging at the temperatures of 1100°C and 1000°C was examined. Diffraction analyses indicate that a nickel-based γ solid solution is a dominating phase in the alloy (so-called nickel austenite). Apart from a solid solution, which constitutes the matrix, certain volume fractions of the other phase were detected e.g. δ phase and carbides. It was found that, due to thermo-mechanical-treatment at both temperatures, the phase composition of Inconel 718 was considerably changed in comparison to the initial state. On the contrary, differences in the temperature of forging did not significantly influence the alloy constitution. However, both of the temperatures of forging result in distinct texture intensity. Microstructure observations indicate that forging at 1000C° led to recrystallization by creation of the new recrystallizated grains near or on the grain boundaries of existing deformed grains. After forging at 1100°C, the microstructure was fully recrystallized at the whole volume of the material.
W pracy przedstawiono wyniki badan wykonanych na stopie niklu Inconel 718. Przebadano materiał w stanie wyjściowym i po kuciu w temperaturach 1100 i 1000°C. Wykonane badania dyfrakcyjne wskazują, ze faza dominującą w stopie jest faza γ roztwór Fe w Ni, często nazywany austenitem niklowym. Oprócz tej fazy, w stopie występują takie fazy jak δ oraz węgliki. Proces kucia w porównaniu do stanu wyjściowego wpływa na skład fazowy (następuje rozpuszczenie niektórych faz i być może przesycenie osnowy), natomiast różnica w temperaturze przeróbki plastycznej nie wpłynęła znacząco na skład fazowy. Obserwacje mikrostruktury wskazują, ze kucie w temperaturze 1100°C prowadzi do pełnej rekrystalizacji dynamicznej, zaś w temperaturze 1000°C rekrystalizacja zachodzi tylko poprzez tworzenie nowych ziarn na granicach ziarn lub w obszarach przy granicach istniejących odkształconych ziarn. Równocześnie, obserwuje się różnice w stopniu steksturowania materiału.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 4; 929-935
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of Hot-Deformed Cu-3Ti Alloy
Autorzy:
Szkliniarz, A.
Szkliniarz, W.
Blacha, L.
Siwiec, G.
Powiązania:
https://bibliotekanauki.pl/articles/352283.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper-titanium alloy
hot deformation
microstructure
recrystallization
Opis:
In the paper, results of investigations regarding temperature and strain rate effects on hot-deformed Cu-3Ti alloy microstructure are presented. Evaluation of the alloy microstructure was performed with the use of a Gleeble HDS-V40 thermal-mechanical simulator on samples subjected to uniaxial hot compression within 700 to 900ºC and at the strain rate of 0.1, 1.0 or 10.0 s-1 until 70% (1.2) strain. It was found that within the analyzed temperature and strain rate ranges, the alloy deformation led to partial or complete recrystallization of its structure and to multiple refinement of the initial grains. The recrystallization level and the average diameter of recrystallized grains increase with growing temperature and strain rate. It was shown that entirely recrystallized, fine-grained alloy structure could be obtained following deformation at the strain rate of min 10.0 s-1 and the temperature of 800°C or higher.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 347-352
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocenka termicheskikh naprjazhenijj pri vosstanovlenii detalejj novym metodom naplavki
Evaluation of thermal stress when reconstruction the details using the new facing technique
Autorzy:
Skoblo, T.
Rybalko, I.
Sidashenko, A.
Tikhonov, A.
Naumenko, A.
Powiązania:
https://bibliotekanauki.pl/articles/77557.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
stress condition
surface
new technique
recrystallization
analysis
calculation
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recrystallization of ferrite in spheroidite of Fe-0.67%C steel
Rekrystalizacja ferrytu w sferoidycie stali Fe-0.67%C
Autorzy:
Matusiewicz, P.
Ratuszek, W.
Zielińska-Lipiec, A.
Powiązania:
https://bibliotekanauki.pl/articles/354122.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rekrystalizacja ferrytu
tekstura
sferoidyt
ferrite recrystallization
texture
coarse spheroidite
Opis:
In this paper the study of ferrite recrystallization in Fe-0.67% C carbon steel with microstructure of the coarse spher-oidite was performed. The purpose of the investigations was to determine the recrystallization mechanism and the sites of recrystallization nucleation. It has been shown indirectly that in the investigated steel after deformation, ε, greater than ε = 9%, recrystallization of the matrix (ferrite) proceeds discontinuously and recrystallization nucleates in the deformation zones around large particles.
W pracy przeprowadzono badania rekrystalizacji ferrytu w węglowej stali Fe-0.67% C o mikrostrukturze grubego sferoidytu, których celem było określenie mechanizmu i miejsc zarodkowania rekrystalizacji po odkształceniu plastycznym na zimno. Wykazano pośrednio, że w badanej stali po odkształceniu ε większym od ε = 9% zachodzi nieciągła rekrystalizacja osnowy (ferryt), a zarodki rekrystalizacji powstają w strefach deformacji wokół dużych cząstek.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 1; 63-69
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shock veins in the Sahara 02500 ordinary chondrite
Autorzy:
Owocki, Krzysztof
Muszyński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/94249.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
ordinary chondrite
shock veins
subsolidus recrystallization
zwyczajny chondryt
rekrystalizacja
Opis:
A specimen of the Sahara 02500 ordinary chondrite contains shock-produced veins consisting of recrystallised fine-grained pyroxenes that include small droplets of Ni-rich metal. Non-melted olivines and pyroxenes show planar deformations filled by shock-melted and -polluted metal and troilite. Shock-melted feldspathic glass is present close to the shock veins. Geothermometric estimations indicate that the meteorite locally experienced moderate shock metamorphism with a minimum local peak temperature above 1400ºC, resulting in partial melting of Ca-poor pyroxene and full melting of feldspars, metal and sulphides. The mineral assemblage in the shock veins suggests a pressure during melt recrystallisation below 10 GPa.
Źródło:
Geologos; 2012, 18, 2; 111-118
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
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