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Tytuł:
Modeling of temperature-dependent cyclic performance of superelastic NiTi shape memory alloy
Autorzy:
Xiao, Yao
Ju, Shuangyan
Lin, Jianping
Powiązania:
https://bibliotekanauki.pl/articles/29520080.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
shape memory alloy
phase transformation
micromechanics
Opis:
In this paper, a three-dimensional micromechanical-based constitutive model is proposed to describe the temperature-dependent performance of a cyclic deformed superelastic NiTi shape memory alloy. The dominant texture of the specimen is prescribed as <111> direction along the longitudinal direction. Apart from martensitic transformation, various mechanisms regarding superelastic degradation are taken into consideration. In order to be extended from the single-crystal scale to the polycrystalline version, the constitutive model is implemented into finite element software. It is verified that the measured cyclic response of a superelastic NiTi is well reproduced by the presented approach. Furthermore, the predicting capability of the proposed model is verified by simulating the mechanical behavior of NiTi tube subjected to cyclic bending.
Źródło:
Computer Methods in Materials Science; 2022, 22, 1; 13-22
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rynek wideo w Polsce
Video market in Poland
Autorzy:
Fortuna, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/920215.pdf
Data publikacji:
2013-01-13
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Video market
film distribution
film reception
cinema in Poland during post-socialist transformation phase
Opis:
The development of VHS market in Poland can be roughly divided into two main periods: first (1980-1988) is the one when that area of pop culture first came into existence and shaped, second (1988-1992) is the "video boom" era. In the years 1980-1988 the video market developed thanks to the cunningness and resourfulness of a large number of people who succumbed to the magic of that new medium. They worked almost entirely illegally because the market was not being regulated by any legal norms and the cassettes that were being produced were of a very low quality. In the years 1988-1992 the VHS market was on a very high demand. Significant piracy-limiting legal norms were introduced and professional production and distribution companies began to play a larger role than before. Renting VHSs and watching movies on one's own TV set became a massive phenomenon. The article is an attempt to tell the unknown story of video-cassettes in Poland – methods of their dissemination, mechanisms of VHS market and influence on Polish audience.
Źródło:
Images. The International Journal of European Film, Performing Arts and Audiovisual Communication; 2013, 13, 22; 27-43
1731-450X
Pojawia się w:
Images. The International Journal of European Film, Performing Arts and Audiovisual Communication
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel Within the Heat Treatment Temperature Range
Autorzy:
Kargul, T.
Powiązania:
https://bibliotekanauki.pl/articles/351831.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal analysis
DSC
solid phase transformation
hypoeutectoid steel
Opis:
The paper presents the results of DSC analysis of steel B500SP produced in the process of continuous casting, which is intended for the production reinforcement rods with high ductility. Studies were carried out in the temperature range below 1000°C in a protective atmosphere of helium during samples heating program. The main objective of the study was to determine the temperature range of austenite structure formation during heating. As a result of performed experiments: Ac1s, Ac1f – temperatures of the beginning and finish of the eutectoid transformation, Ac2 – Curie temperature of the ferrite magnetic transformation and the temperature Ac3 of transformation of proeutectoid ferrite into austenite were elaborated. Experimental determination of phase transformations temperatures of steel B500SP has great importance for production technology of reinforcement rods, because good mechanical properties of rods are formed by the special thermal treatment in Tempcore process.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 891-897
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the anatase to rutile transformation kinetics of the modified TiO2
Autorzy:
Grzmil, B.
Gleń, M.
Kic, B.
Lubkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/779360.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
TiO2
anatase
rutile
modification
phase transformation kinetics
Opis:
TiO2 attracts much interest because of its many potential applications. The use of titanium dioxide strongly depends on its polymorphic form: brookite, anatase, or rutile. Only rutile and anatase play an important role in industry. Anatase as a metastable form undergoes a non-reversible transformation into rutile. Understanding the kinetics of phase transformation and the processes of crystal growth of a material is essential for controlling its structure and, thus, its specific properties. The main purpose of this paper is to explain the anatase to rutile recrystallization kinetics in the modified TiO2 calcined from industrial hydrated titanium dioxide. The apparent activation energy of anatase to rutile transformation and the average size of titanium dioxide crystallites were determined for the unmodified TiO2 and TiO2 modified with P, K, Al, B, Zn, Zr, Ce, Sn, or Sb introduced in the amount of 0.5 mol% and 1.0 mol% when recalculated for their oxides. The growth of TiO2 crystallites during calcination was strongly inhibited by P, Ce and Zr, and inhibited to a lesser degree by Al, Sn and Sb. B and Zn did not affect the investigated process and K accelerated crystallites growth. The values of apparent activation energy depending on a modifier formed a relationship: Al
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 2; 73-80
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermomechanical States in Arc Weld Surfaced Steel Elements
Autorzy:
Winczek, J.
Skrzypczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/352289.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
temperature field
phase transformation
Gas Metal Arc Weld surfacing
Opis:
Kinetics of phase transformations during heating is limited by temperature values at the beginning and at the end of austenitic transformation, while the progress of phase transformations during cooling is determined on the basis of TTT-welding diagram and Johnson-Mehl-Avrami and Kolomogorov law for diffusive transformations and Koistinen-Marburger for martensitic transformation. Stress state of a bar subjected to thermo-mechanical loads is described assuming the plane cross section hypothesis and using integral equations of stress equilibrium of a bar as well as simple Hook’s law. Stresses in the elastic-plastic state are determined by iteration using solutions with a variable elastic modulus of elasticity, conditioned by tensile curves. Dependence of stresses on strains is assumed on the basis of tensile curves of particular structures, taking into account the influence of temperature. There were performed calculations of the temperature field, phase transformations, strains and stresses for GMAW surfacing of a cuboid element made of S235 steel. Authors’ programs, made in Borland Delphi, were used for calculations.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1623-1634
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of a phase transformation model for partial hardening in hot stamping
Autorzy:
Hart-Rawung, T.
Buhl, J.
Bambach, M.
Powiązania:
https://bibliotekanauki.pl/articles/99913.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
coefficient of thermal expansion
phase transformation model
hot stamping
Opis:
The quality of predicted microstructural and mechanical properties in hot stamping simulations relies considerably on the material model. Many researchers studied the effect of the plastic deformation on the phase transformation of the most commonly used hot stamping steel 22MnB5, and proved that the deformation applied at high temperature promotes the formation of ferrite, pearlite and bainite. This behaviour has to be integrated into materials modelling. In this study, the effect of pre-strain on the phase transformation of the material is considered. The specimens are heated to austenitization temperature, isothermally deformed at 700°C, and quenched down to room temperature. The phase fractions and the temperature-dilatation behaviour obtained from the experiments are used to calibrate the material model. By using the experimental data obtained from dilatometer testing, the accuracy of the material model is evaluated. Additionally, an attempt to predict the results between the tested data points by using interpolation was made and compared with the simulation results.
Źródło:
Journal of Machine Engineering; 2018, 18, 3; 87-97
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of Thermomechanical States in Multipass Arc Weld Surfaced Steel Elements
Autorzy:
Winczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/352503.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
temperature field
phase transformation
Gas Metal Arc Weld surfacing
Opis:
The paper presents the analysis of temperature fields, phase transformations, strains and stresses in a cuboidal element made from S235 steel, surfaced with multipass GMA (Gas Metal Arc) method. The temperature field is described assuming a dual-distribution heat source model and summing up the temperature fields induced by the padded weld and by the electric arc. Dependence of stresses on strains is assumed on the basis of tensile curves of particular structures, taking into account the influence of temperature. The calculations were carried out on the example of five welds in the middle of the plate made of S235 steel. The simulation results are illustrated in graphs of thermal cycles, volume shares of structural components and stresses at the selected points of cross-section, and the temperature and strain distributions in the whole cross section.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1615-1628
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Evolution During Extraction and Recovery of Pure Nd from Magnet
Autorzy:
Rasheed, Mohammad Zarar
Nam, Sun-Woo
Lee, Sang-Hoon
Park, Sang-Min
Cho, Ju-Young
Kim, Taek-Soo
Powiązania:
https://bibliotekanauki.pl/articles/2048880.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Liquid Metal Extraction
rare earth recycling
vacuum distillation
phase transformation
Opis:
Liquid Metal Extraction process using molten Mg was carried out to obtain Nd-Mg alloys from Nd based permanent magnets at 900°C for 24 h. with a magnet to magnesium mass ratio of 1:10. Nd was successfully extracted from magnet into Mg resulting in ~4 wt.% Nd-Mg alloy. Nd was recovered from the obtained Nd-Mg alloys based on the difference in their vapor pressures using vacuum distillation. Vacuum distillation experiments were carried out at 800°C under vacuum of 2.67 Pa at various times for the recovery of high purity Nd. Nd having a purity of more than 99% was recovered at distillation time of 120 min and above. The phase transformations of the Nd-Mg alloy during the process, from Mg12Nd to α-Nd, were confirmed as per the phase diagram at different distillation times. Pure Nd was recovered as a result of two step recycling process; Liquid Metal Extraction followed by Vacuum Distillation.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1001-1005
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of critical points of hypoeutectoid steels
Wyznaczanie punktów krytycznych w stalach podeutektoidalnych
Autorzy:
Pawłowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/355790.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phase transformation
pearlite dissolution finish temperature
dilatometry
multi-peak fitting
Opis:
The paper presents a new approach to interpretation of hypoeutectoid steel dilatograms upon heating between the austenite start and austenite finish temperatures. The proposed derivative curve separation method yields data which accords with the experimental results. Besides the new method appears a useful tool whereby it becomes possible to confirm the evidence reported earlier in literature that when a hypoeutectoid steel heats up to between the A ⊂1 and the A ⊂3 both ferrite and pearlite start to transform into austenite almost at the same time.
Wpracy przedstawiono nowy sposób interpretacji dylatogramów nagrzewania stali podeutektoidalnych w zakresie przemiany perlitu i ferrytu w austenit. Zastosowanie proponowanej metody analizy dylatogramów nagrzewania stali podeutektoidalnych pozwoliło równiez na potwierdzenie publikowanych wczesniej w literaturze doniesien o jednoczesnym zachodzeniu przemiany perlitu w austenit z przemiana ferrytu w austenit w zakresie temperatury pomiedzy A ⊂1 i A ⊂3.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 4; 957-962
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformation Diagrams of Selected Steel Grades with Consideration of Deformation Effect
Autorzy:
Kawulok, R.
Schindler, I.
Mizera, J.
Kawulok, P.
Rusz, S.
Opěla, P.
Podolínský, P.
Čmiel, K. M.
Mališ, M.
Powiązania:
https://bibliotekanauki.pl/articles/351710.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transformation diagrams of steels
phase transformation
plastic deformation
dilatometric tests
Gleeble 3800
Opis:
The aim of this article was to assess the effect of previous plastic deformation on the transformation kinetics of selected steels with a wide range of chemical composition. Transformation (CCT and DCCT) diagrams were constructed on the basis of dilatometric tests on the plastometer Gleeble 3800 and metallographic analyses supplemented by measurements of HV hardness. Effect of previous deformation on transformation was evaluated of the critical rate of formation of the individual structural components (ferrite, pearlite and bainite) in the case of formation of martensite respect to Ms temperature. Previous plastic deformation accelerated especially diffuse transformations (ferrite and pearlite), temperature of Ms was lower after previous plastic deformation and bainitic transformation was highly dependent on the chemical composition of steel.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 55-60
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Behaviour of steel with the metastable austenite during segmental grinding
Autorzy:
Dąbrowski, L.
Jeleńkowski, J.
Marciniak, M.
Szczęśniak, D.
Powiązania:
https://bibliotekanauki.pl/articles/132144.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
segmental grinding
temperature registration
metastable austenite
deformation martensite
phase transformation
Opis:
The methods of the grinding process efficiency evaluation have been presented in this paper basing upon the temperature in the workpiece tool contact area. The technique of determining this temperature has also been given as a combination of analytical and experimental process. These are especially useful by properties and phase transformation investigations in the metastable austenite steels.
Źródło:
Advanced Technologies in Mechanics; 2014, 1, no. 1 (1); 32-40
2392-0327
Pojawia się w:
Advanced Technologies in Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constitutive model of plastic strain induced phenomena at cryogenic temperatures
Opis konstytutywny zjawisk wywołanych odkształceniami plastycznymi w temperaturach kriogenicznych
Autorzy:
Skoczeń, B.
Powiązania:
https://bibliotekanauki.pl/articles/280706.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
constitutive behaviour
yield condition
phase transformation
voids and inclusions
cryogenic temperature
Opis:
FCC metals and alloys are frequently used in cryogenic applications, nearly down to the temperature of absolute zero, because of their excellent physical and mechanical properties, including ductility. These materials, often characterized by the Low Stacking Fault Energy (LSFE), undergo at low temperatures three distinct phenomena: Dynamic Strain Ageing (DSA), plastic strain induced transformation from the parent phase to the secondary phase _ and evolution of micro-damage. As all three phenomena lead to irreversible degradation of lattice and can accelerate the process of material failure, a combined constitutive description appears to be fundamental for the correct analysis of structures applied at very low temperatures. The constitutive model presented in the paper takes into account all the three phenomena as well as the relevant thermodynamic background.
Materiały konstrukcyjne (metale lub ich stopy) o sieci krystalicznej regularnej ściennie centrowanej są często stosowane w temperaturach kriogenicznych (także w temperaturach bliskich absolutnego zera) z uwagi na bardzo dobre własności fizyczne i mechaniczne, a w szczególności wysoką plastyczność. Materiały te, charakteryzujące się z reguły niską energią błędu ułożenia, podlegają w niskich temperaturach trzem procesom: dynamicznemu starzeniu odkształceniowemu (które generuje nieciągłe płynięcie plastyczne), przemianie fazowej od struktury regularnej ściennie centrowanej do struktury regularnej przestrzennie centrowanej oraz ewolucji mikrouszkodzeń. Wszystkie te zjawiska prowadzą do nieodwracalnej degradacji sieci krystalicznej i szybszego zniszczenia materiału, dlatego budowa modelu konstytutywnego staje się nieodzownym elementem projektowania konstrukcji pracujących w temperaturach kriogenicznych. Model konstytutywny przedstawiony w artykule ujmuje wszystkie wyżej wymienione zjawiska, jak również termodynamikę procesów zacho- dzących w sieci krystalicznej w niskich temperaturach.
Źródło:
Journal of Theoretical and Applied Mechanics; 2008, 46, 4; 949-971
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional model of thermomechanical evolution of shape memory materials
Autorzy:
Pawłow, I.
Powiązania:
https://bibliotekanauki.pl/articles/205532.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
termodynamika
martensitic phase transformation
shape memory
thermodynamically consistent model
thermomechalical evolution
Opis:
We derive a thermodynamically consistent model of the thermomechanical evolution of shape memory materials in three dimensions. The model is based on the linearized strain tensor and the absolute temperature as state variables. It accounts for the viscous and spatially nonlocal effects, and constitutes a generalization of the one-dimensional Falk model. The constitutive equations comply with the entropy inequality. Examples of free energies characteristic for shape memory alloys and noncrystalline materials are given.
Źródło:
Control and Cybernetics; 2000, 29, 1; 341-365
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model to predict microstructure of the heat treated of steel elements
Model numeryczny przewidywania mikrostruktury elementów stalowych obrabianych cieplnie
Autorzy:
Domański, T.
Bokota, A.
Powiązania:
https://bibliotekanauki.pl/articles/382375.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hardening process
phase transformation
numerical simulation
proces hartowania
przemiana fazowa
symulacja numeryczna
Opis:
In work the presented numerical models of tool steel hardening processes take into account thermal phenomena and phase transformations. Numerical algorithm of thermal phenomena was based on the Finite Elements Methods of the heat transfer equations. In the model of phase transformations, in simulations heating process continuous heating (CHT) was applied, whereas in cooling process continuous cooling (CCT) of the steel at issue. The phase fraction transformed (austenite) during heating and fractions during cooling of ferrite, pearlite or bainite are determined by Johnson-Mehl-Avrami formulas. The nescent fraction of martensite is determined by Koistinen and Marburger formula or modified Koistinen and Marburger formula. In the simulations of hardening was subject the fang lathe of cone (axisymmetrical object) made of tool steel.
Prezentowany w pracy model numeryczny procesu hartowania stali narzędziowej uwzględnia zjawiska cieplne i przemiany fazowe w stanie stałym. Algorytm numeryczny zjawisk cieplnych oparto na rozwiązaniu metodą elementów skończonych, w sformułowaniu Galernika, równania przewodzenia ciepła. W modelu przemian fazowych korzysta się z wykresów ciągłego nagrzewania (CTPa), oraz z wykresów ciągłego chłodzenia (CTPc) rozważanej stali. Ułamek fazy przemienionej (austenit) oraz ułamki ferrytu, perlitu lub bainitu wyznacza się formułami Johnsona-Mehla i Avramiego. Ułamek powstającego martenzytu wyznacza się wzorem Koistinena i Marburgera lub zmodyfikowanym wzorem Koistinena i Marburgera.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 29-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Phase Transformation Kinetics in Austempered Ductile Iron
Autorzy:
Tyrała, E.
Górny, M.
Kawalec, M.
Powiązania:
https://bibliotekanauki.pl/articles/379659.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austempered ductile iron
phase transformation
dilatometry
żeliwo sferoidalne ausferrytyczne
przemiana fazowa
dylatometria
Opis:
The kinetics reaction occurring during the austempering treatment of ductile iron containing different concentration of Cu and Ni was studied. The samples were subjected to heat treatment in dilatometry equipment. In addition to that Vickers hardness measurements and metallographic investigations were performed. The exponential equation was used to describe the isothermal transformation processes. The dilatometric studies indicate that the addition of copper in contrast to the addition of copper and nickel does not significantly affect incubation time of austempering transformation. It has been shown that austermpering process is characterized by different transformation rate. In the initial range the addition of copper, and even in a greater extent both copper and nickel reduces its rate and moves the maximum value of the right. Results of this study also indicate that the initial growth of plates of ferrite occurs mainly diffusionlessly and the resulting maximum on the transformation rate curve should be identified with the time after which predominantly ferrite plates growth by diffusion.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 175-178
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 60

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