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Wyszukujesz frazę "hot deformation" wg kryterium: Temat


Tytuł:
Y Addition Effects on Hot Deformation Behavior of Cu-Zr Alloys with High Zr Content
Autorzy:
Tian, K.
Tian, B.
Volinsky, A. A.
Zhang, Y.
Liu, Y.
Du, Y.
Powiązania:
https://bibliotekanauki.pl/articles/350979.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu-1%Zr alloy
high Zr content
yttrium
hot deformation activation energy
dynamic recrystallization
Opis:
Isothermal hot compression experiments were carried out using the Gleeble-1500D thermal mechanical simulator. The flow stress of the Cu-1%Zr and Cu-1%Zr-0.15%Y alloys was studied at hot deformation temperature of 550°C, 650°C, 750°C, 850°C, 900°C and the strain rate of 0.001 s-1, 0.01 s-1, 0.1 s-1, 1 s-1, 10 s-1. Hot deformation activation energy and constitutive equations for two kinds of alloys with and without yttrium addition were obtained by correlating the flow stress, strain rate and deformation temperature. The reasons for the change of hot deformation activation energy of the two alloys were analyzed. Dynamic recrystallization microstructure evolution for the two kinds of alloys during hot compression deformation was analyzed by optical and transmission electron microscopy. Cu-1%Zr and Cu-1%Zr-0.15%Y alloys exhibit similar behavior of hot compression deformation. Typical dynamic recovery occurs during the 550-750°C deformation temperature, while dynamic recrystallization (DRX) occurs during the 850-900°C deformation temperature. High Zr content and the addition of Y significantly improved Cu-1%Zr alloy hot deformation activation energy. Compared with hot deformation activation energy of pure copper, hot deformation activation energy of the Cu-1%Zr and Cu-1%Zr-0.15%Y alloys is increased by 54% and 81%, respectively. Compared with hot deformation activation energy of the Cu-1%Zr alloy, it increased by 18% with the addition of Y. The addition of yttrium refines grain, advances the dynamic recrystallization critical strain point and improves dynamic recrystallization.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 875-882
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wysokowytrzymałe niskostopowe stale na odkuwki matrycowe chłodzone w sposób regulowany bezpośrednio po kuciu
High strength low alloy steels for closed die forgings subjected to controlled cooling directly after forging process
Autorzy:
Garbarz, B.
Żak, A.
Walnik, B.
Zalecki, W.
Powiązania:
https://bibliotekanauki.pl/articles/182061.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
odkuwka matrycowa
stal wysokowytrzymała
regulowane chłodzenie
odkształcenie na gorąco
przemiany fazowe
właściwości mechaniczne
mikrostruktura
closed die forging
high-strength steel
controlled cooling
hot deformation
phase transformations
mechanical properties
microstructure
Opis:
Artykuł zawiera wyniki badań eksperymentalnych, których celem był dobór składu chemicznego stali i opracowanie parametrów chłodzenia bezpośrednio po kuciu, zapewniających uzyskanie wysokiej wytrzymałości oraz dobrej plastyczności i udarności odkuwek matrycowych o średnicy /grubości do ok. 50 mm. Eksperymentalne stale poddano badaniom hartowności, opracowano diagramy przemian fazowych CTPc, wykonano symulacje obróbek cieplnoplastycznych, przeprowadzono badania mikro-strukturalne i dla wybranych wariantów obróbki zmierzono właściwości mechaniczne. Wykazano, że uzyskanie wysokiej udarności KVCharpyV/+20℃ na poziomie 170 J przy wytrzymałości powyżej 1000 MPa umożliwia stal zawierająca 0,1%C, 1,8%Mn, 0,4%Cr, o strukturze bainityczno-martenzytycznej składającej się z ok. 70% bainitu i ok. 30% martenzytu listwowego. Otrzymanie bardzo wysokiej wytrzymałości powyżej 1400 MPa i udarności KVCharpyV/+20℃ minimum 60 J jest możliwe dla stali zawierającej 0,2%C, 1,5%Mn, 0,4%Cr, 0,3%Mo, o mikrostrukturze martenzytyczno-bainitycznej składającej się z 50% lub nieco większej ilości martenzytu listwowego i 50% lub nieco mniejszej ilości bainitu.
The paper presents results of experimental investigation aimed at selection of chemical composition of steel and development of parameters of cooling directly after forging allowing to obtain high strength and good plasticity and impact toughness of closed die forgings with diameter/thickness up to 50 mm. The experimental steels were characterised by assessment of the hardenability, developing of CCT phase diagrams, the effects of thermomechanical treatments and - for chosen variants - measurements of mechanical properties and description of microstructure. It was shown that high impact toughness KVCharpyV/+20℃ at the level of 170 J and strength over 1000 MPa are possible to obtain for steel containing 0.1%C, 1.8%Mn, 0.4%Cr, with bainitic-martensitic microstructure comprising ca 70% of bainite and ca 30% of lath martensite. A very high strength over 1400 MPa and impact toughness KVCharpyV/+20℃ minimum of 60 J can be obtained for steel containing 0.2%C, 1.5%Mn, 0.4%Cr, 0.3%Mo, with martensitic-bainitic microstructure comprising 50% or some more of lath martensite and 50% or little less of bainite.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2017, T. 69, nr 4, 4; 19-33
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The investigation of Microstructures and Properties of High Speed Steel HS6-5-2-5 after Laser Alloying
Badanie struktury i własności stopowanej laserowo stali szybkotnącej HS6-5-2-5
Autorzy:
Bonek, M.
Powiązania:
https://bibliotekanauki.pl/articles/351220.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Zr-1%Nb
rods
tube
physical modeling
hot
cold deformation
pręty
rury
modelowanie fizyczne
obróbka cieplna
odkształcenie na zimno
Opis:
This paper presents the results of the influence of laser alloying on structure and properties of the surface of HS6-5-2-5 high speed steel, carried out using a high power diode laser (HPDL). WC, VC, TiC, SiC, Si3N4 and Al2O3 particles powder was used for alloying. It was found out that remelting and laser alloying with hard particles result in structure refinement across the entire investigated laser power range. Selection of laser operating conditions is discussed, as well as beam face quality after remelting, hardness, micro hardness test, EDX, X-ray microanalysis results. Fine grained, dendritic structures occur in the remelted and alloyed zone with the crystallization direction related to the dynamical heat movement from the laser beam influence zone. The fine grained martensite structure is responsible for hardness increase of the alloyed layer. Micro-hardness changes depend up in the effects of the laser beam on the treated surface, and especially in the alloyed layer. The outcome of the research provides better understanding of the structural mechanisms accompanying laser remelting and alloying. Laser technique features the especially promising tool for solving the contemporary surface engineering problems thanks to the physical properties of the laser beam, making it possible to focus precisely the delivered energy in the form of heat in the surface layer.
W pracy przedstawiono wyniki badań laserowego stopowania na strukturę i własności warstwy wierzchniej stali szybkotnącej HS6-5-2-5, przetapianej za pomocą lasera diodowego dużej mocy (HPDL). Jako materiał stopujący użyto proszków WC, VC, TiC, SiC, Si3N4 i AI2O3. Stwierdzono, że do przetopienia i stopowanie laserowe twardymi cząstkami powoduje poprawę własności warstwy wierzchniej w całym zakresie mocy lasera. Odpowiedni dobór warunków pracy lasera jak również jakość wiązki ma wpływ na wyniki przetopienia co potwierdzono badaniami twardości, mikrotwardości, mikroanalizy rentgenowskiej i rentgenowskie analizy fazowej. W strefie przetopionej i stopowanej stwierdzono występowanie drobnoziarnistej oraz dendrytycznej struktury z kierunkiem krystalizacji związanym z dynamicznym przepływem ciepła ze strefy oddziaływania wiązki laserowej. Drobnoziarnista struktura martenzytu jest odpowiedzialna za wzrost twardości warstwy stopowanej. Zmiany mikrotwardości ściśle zależą od efektów oddziaływania wiązki laserowej na obrabianą powierzchnię. Wyniki badań pozwalają na lepsze zrozumienie mechanizmów strukturalnych towarzyszących przetapianiu i stopowaniu laserowemu. Laserowa obróbka powierzchniowa stanowi szczególnie obiecujące narzędzie do rozwiązywania problemów inżynierii powierzchni dzięki wykorzystaniu własności fizycznych wiązki lasera umożliwiających precyzyjną obróbkę cieplną w warstwie wierzchniej.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1647-1651
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Choice of Initial Conditions and of Solution in the Problem of Efficiency Increase of Pipes Calibration on a Mandrel
Autorzy:
Salikhyanov, D.
Bogatov, A.
Dyja, H.
Powiązania:
https://bibliotekanauki.pl/articles/352003.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot-rolled pipe
pipe calibration on a mandrel
pipe precision index
extrafocal deformation
finite element simulation
FEM
Opis:
This research work is devoted to the theoretical study of the pipe calibration on a mandrel. The aim of the study is to improve the precision of the calibrated pipes. As the paper shows, it is advisable to apply different methods of research depending on the purpose of the study of metal forming processes: mathematical, computer or physical simulation. Analytical review of existing mathematical models of the pipes calibration on a mandrel showed that the set of assumptions adopted in the mathematical modeling does not allow assessing the precision of the pipes during calibration. Therefore, finite-element method simulation package was used for this research. Research method and pipes precision index were developed on the basis of the computer simulation using Deform-3D package. The investigations have allowed us to get the dependence of the pipe precision on technological factors and to identify the root cause of reduced efficiency calibration – extrafocal deformation.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 739-742
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characteristic of deformability and quantitative description of the microstructure of hot-deformed Ni-Fe superalloy
Autorzy:
Ducki, K. J.
Rodak, K.
Mendala, J.
Wojtynek, L.
Powiązania:
https://bibliotekanauki.pl/articles/351819.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Incolloy 718
hot deformation
recrystallization
quantitative metallography
Zener-Hollomon parameter
Opis:
The paper presents the results of research concerning the influence of hot plastic working parameters on the deformability and microstructure of a Ni-Fe superalloy. The research was performed on a torsion plastometer in the range of temperatures of 900-1150°C, at a strain rates 0.1 and 1.0 s-1. Plastic properties of the alloy were characterized by the worked out flow curves and the temperature relationships of flow stress and strain limit. The structural inspections were performed on microsections taken from plastometric samples after so-called “freezing”. The stereological parameters as the recrystallized grain size, inhomogenity and grain shape have been determined. Functional relations between the Zener-Hollomon parameter and the maximum yield stress and the average grain area have been developed and the activation energy for hot working has been estimated.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 297-302
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Dynamic Recrystallization Models of 21-4N Heat Resistant Steel
Autorzy:
Li, Yiming
Huang, Xiaomin
Ji, Hongchao
Li, Yaogang
Wang, Baoyu
Tang, Xuefeng
Powiązania:
https://bibliotekanauki.pl/articles/2049422.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
21-4N
hot deformation
dynamic recrystallization
critical strain
volume fraction
Opis:
The high-temperature deformation process and dynamic recrystallization (DRX) process of 21-4N were investigated under the conditions of the deformation temperature range of 1273~1453K, the strain rate range of 0.01~10s-1 and the deformation degree of 60% (the total deformation is 0.916) by using Gleeble-1500D thermal simulated test machine. The curves of stress-strain (σ – ε) were obtained, and the curves of work hardening rate (θ) and strain (ε) were obtained by taking derivative of σ – ε. The DRX critical strains under different conditions were determined by the curves of work hardening rate (θ – ε), and the DRX critical strain model was established. The peak strains of 21-4N were obtained by the curves of σ – ε, the relationship between peak stress (σp) and critical strain (εc) was determined, and the peak strain model was established. The DRX volume fraction models of 21-4N were established by using Avrami equation. The DRX grain size of 21-4N was calculated by Image Pro Plus 6.0, and its DRX grain size models were established.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 145-152
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Hot Deformation Behavior of CuFe2 Alloy
Autorzy:
Schindler, I.
Sauer, M.
Kawulok, P.
Rodak, K.
Hadasik, E.
Jabłońska, M. Barbara
Rusz, S.
Ševčák, V.
Powiązania:
https://bibliotekanauki.pl/articles/353206.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper alloy CuFe2
hot ductility
stress-strain curves
hot deformation activation energy
Opis:
Nil strength temperature of 1062°C and nil ductility temperature of 1040°C were experimentally set for CuFe2 alloy. The highest formability at approx. 1020°C is unusable due to massive grain coarsening. The local minimum of ductility around the temperature 910°C is probably due to minor formation of γ-iron. In the forming temperatures interval 650-950°C and strain rate 0.1-10 s-1 the flow stress curves were obtained and after their analysis hot deformation activation energy of 380 kJ·mol-1 was achieved. Peak stress and corresponding peak strain values were mathematically described with good accuracy by equations depending on Zener-Hollomon parameter.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 701-706
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of flow softening mechanisms of a nickel-based superalloy with o phase
Autorzy:
Lin, Y. C.
He, D.-G
Chen, M. S.
Chen, X.-M.
Zhao, C.-Y.
Ma, X.
Powiązania:
https://bibliotekanauki.pl/articles/958203.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloys
hot deformation
flow softening behavior
microstructural evolution
Opis:
The flow softening behaviors of a nickel-based superalloy with o phase are investigated by hot compression tests over wide ranges of deformation temperature and strain rate. Electron backscattered diffraction (EBSD). optical microscopy (OM), and scanning electron microscopy (SEM) are employed to study the flow softening mechanisms of the studied superalloy. It is found that the flow softening behaviors of the studied superalloy are sensitive to deformation temperature and strain rate. At high strain rate and low deformation temperature, the obvious flow softening behaviors occur. With the increase of deformation temperature or decrease of strain rate, the flow softening degree becomes weaken. At high strain rate (1s-1), the flow softening is mostly induced by the plastic deformation heating and flow localization. However, at low strain rate domains (0.001-0.01s-1), the effects of deformation heating on flow softening are slight. Moreover, the flow softening at low strain rates is mainly induced by the discontinuous dynamic recrystallization and the dissolution of 6 phase (Ni3Nb).
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1537-1546
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segregation behaviour of third generation advanced high-strength Mn-Al steels
Autorzy:
Grajcar, A.
Powiązania:
https://bibliotekanauki.pl/articles/382818.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
makrosegregacja
mikrosegregacja
AHSS
stal typu TRIP
EDS
mikrostruktura
odkształcenie wysokotemperaturowe
mikrododatek stopowy
macrosegregation
microsegregation
Advanced High Strength Steel (AHSS)
TRIP steel
microstructure
hot deformation
microalloying
Opis:
The paper addresses the macro- and microsegregation of alloying elements in the new-developed Mn-Al TRIP steels, which belong to the third generation of advanced high-strength steels (AHSS) used in the automotive industry. The segregation behaviour both in the as-cast state and after hot forging was assessed in the macro scale by OES and by EDS measurements in different structural constituents. The structural investigations were carried out using light and scanning electron microscopy. A special attention was paid to the effect of Nb microaddition on the structure and the segregation of alloying elements. The tendency of Mn and Al to macrosegregation was found. It is difficult to remove in Nb-free steels. Microsegregation of Mn and Al between austenite and ferritic structural constituents can be removed.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 123-128
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Modelling of the Plastic Working Processes of Zirconium Alloy Bars and Tubes in Thermomechanical Conditions
Modelowanie fizyczne procesów przeróbki plastycznej prętów i rur ze stopu cyrkonu w warunkach termomechanicznych
Autorzy:
Kawałek, A.
Dyja, H.
Gałkin, A. M.
Ozhmegov, K.V.
Sawicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/353960.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Zr-1%Nb
tube
physical modeling
hot
cold deformation
pręty
rury
modelowanie fizyczne
odkształcenie na zimno
Opis:
The article presents results of physical modelling of processes of plastic working of the modified Zr-1%Nb zirconium alloy, obtained using different methods of the plastometric testing. The „Gleeble 3800”‚ metallurgical process simulator, a DIL805 A/D dilatometer with a plastometric attachment, and a „Setaram‚ plastometer were used for testing. Based on the obtained testing results, the values of the yield stress and limiting plasticity of the tested alloy were determined for wide ranges of temperature variation (T=20÷950°C) and strain rate variation (ε=0.1÷15.0 s-1) under continuous loading conditions. It was found that by using different testing methods, different alloy properties, characteristic for a given plastic working process, could be obtained.
W artykule przedstawiono wyniki modelowania fizycznego procesów przeróbki plastycznej modyfikowanego stopu cyrkonu Zr-1%Nb, otrzymane za pomocą różnych metod badań plastometrycznych. Do badań zastosowano symulator procesów metalurgicznych „Gleeble 3800”‚ dylatometr DIL805 A/D z przystawką plastometryczną i plastometr „Setaram‚. Na podstawie otrzymanych wyników badań określono wartość naprężenia uplastyczniającego i plastyczności granicznej stopu dla szerokiego zakresu zmian temperatury (T=20÷950°C) i prędkości odkształcenia (ε=0.1÷15.0 s-1), w warunkach obciążania ciągłego. Stwierdzono, że stosując różne metody badawcze można uzyskać inne własności stopu, charakterystyczne dla danego procesu przeróbki plastycznej.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 935-940
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Hot Distortion Test to Investigate the Effect of the Inorganic Binder on the High-Temperature Behaviour of Physically Hardened Moulding Sands
Autorzy:
Stachowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/382822.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
sodium silicate
bonded sand
thermal deformation
hot distortion test
microwave heating
odlewnictwo
krzemian sodu
piasek związany
odkształcanie termiczne
nagrzewanie mikrofalowe
Opis:
This study is an attempt to determine by Hot Distortion Test (HDT) the impact of physical methods of hardening inorganic binders in the moulding sands on phenomena caused by influence of thermal energy from heating elements with a temperature of 900°C +/- 10°C. Medium silica sand-based moulding mixtures were densified and then hardened using two physical methods: microwave heating at a frequency of 2.45 GHz or classical drying at a temperature of 110°C. Sodium silicate bonded sand (SSBS) with five unmodified kinds of hydrated sodium silicates subjected to two different types of hardening method were assessed in terms of their behaviour in high temperature. Thermal behaviour by means of deformation measurement was carried out with a modified Hot Distortion Test (mHDT). Due to this advanced, but unstable by appropriate standards Hot Distortion Test gives an opportunity to measure thermoplastic deformations (L) in moulding sands in many aspects, such as time of annealing. Research carried out in this way exposed differences between inorganic binders with molar module ranging from 3.4 to 2.0. It was established that deformations under the influence of high temperature last the longest in SSBS containing binders with molar module ranging from 3.4 to 2.9. Similarly, for these types of moulding sands the method of hardening the binder is found to be essential for increasing/decreasing the rate of thermoplastic deformations during the annealing of samples. The samples of SSBS made with binders with molar module from 2.5 to 2.0 are found to be excessively susceptible to thermoplastic deformation as a result of heating them in high environmental temperature presence.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 45-50
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of Plastic Flow Behaviour of Metals in the Hot Deformation Process Using Artificial Intelligence Methods
Autorzy:
Mrzygłód, Barbara
Łukaszek-Sołek, Aneta
Olejarczyk-Wożeńska, Izabela
Pasierbiewicz, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/2174622.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot deformation
Inconel 718
rheological model
forming process
neuro-fuzzy inference system
odkształcanie na gorąco
model reologiczny
proces formowania
Opis:
Hot deformation of metals is a widely used process to produce end products with the desired geometry and required mechanical properties. To properly design the hot forming process, it is necessary to examine how the tested material behaves during hot deformation. Model studies carried out to characterize the behaviour of materials in the hot deformation process can be roughly divided into physical and mathematical simulation techniques. The methodology proposed in this study highlights the possibility of creating rheological models for selected materials using methods of artificial intelligence, such as neuro-fuzzy systems. The main goal of the study is to examine the selected method of artificial intelligence to know how far it is possible to use this method in the development of a predictive model describing the flow of metals in the process of hot deformation. The test material was Inconel 718 alloy, which belongs to the family of austenitic nickel-based superalloys characterized by exceptionally high mechanical properties, physicochemical properties and creep resistance. This alloy is hardly deformable and requires proper understanding of the constitutive behaviour of the material under process conditions to directly enable the optimization of deformability and, indirectly, the development of effective shaping technologies that can guarantee obtaining products with the required microstructure and desired final mechanical properties. To be able to predict the behaviour of the material under non-experimentally tested conditions, a rheological model was developed using the selected method of artificial intelligence, i.e. the Adaptive Neuro-Fuzzy Inference System (ANFIS). The source data used in these studies comes from a material experiment involving compression of the tested alloy on a Gleeble 3800 thermo-mechanical simulator at temperatures of 900, 1000, 1050, 1100, 1150oC with the strain rates of 0.01 - 100 s-1 to a constant true strain value of 0.9. To assess the ability of the developed model to describe the behaviour of the examined alloy during hot deformation, the values of yield stress determined by the developed model (ANFIS) were compared with the results obtained experimentally. The obtained results may also support the numerical modelling of stress-strain curves.
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 41--52
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of warm worked Zircalloy-4
Mikrostruktura stopu Zircalloy-4 przetwarzanego w podwyższonych temperaturach
Autorzy:
Paul, H.
Darrieulat, M.
Vanderesse, N.
Lityńska, L.
Miszczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/353449.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Zircalloy-4
mikrostruktura
cząstki drugiej fazy
deformacja cieplna
bliźniakowanie
microstructure
twinning
second phase particles
hot deformation
Opis:
The microstructure of commercial purity Zircalloy-4 (Zry-4) compressed at temperatures 650°C and 750°C up to strains of 0.8 was characterized over a wide range of scales, using optical metallography, scanning (SEM) and transmission (TEM) electron microscopy. The typical microstructure after warm deformation consisted of the α-phase matrix and the second phase particles (SPP) enriched in Fe and Cr. Two kinds of these particles were observed. The large isolated SPP were situated along boundaries of lamellae of α-phase, whereas very fine intermetallic particles were nearly homogeneously distributed inside the lamellae. The intensity of recrystallization was main factor deciding on microstructure development in this material. The efficiency of that process increased quite rapidly with temperature or decreasing strain rate. The appearance of twins was the second important feature of the "warm deformed" structure with the prevailing {1102} - type system of twins. They were occasionally observed in all samples after the deformation at 650°C and 750°C temperatures.
W pracy dokonano wieloskalowej charakterystyki mikrostruktury stopu Zircalloy-4 przerabianego plastycznie w zakresie pośrednich temperatur, tj. 650°C-750°C, w zakresie odkształceń logarytmicznych do 0.8, z wykorzystaniem technik mikroskopii optycznej oraz skaningowej i transmisyjnej mikroskopii elektronowej. W obrazie mikrostruktury obserwowano płytki fazy α oraz wydzielenia cząstek drugiej fazy wzbogaconoej w Fe oraz Cr. Obserwowano dwa typy wydzieleń. Duże izolowane cząstki usytuowane były wzdłuż granic płytek fazy α, podczas gdy wydzielenia dyspersyjne rozmieszczone były równomiernie w strukturze stopu. Głównym parametrem który decydował o zróżnicowaniu w strukturze stopu była intensywność zachodzenia procesu rekrystalizacji, która silnie uzależniona była od temperatury i prędkości odkształcenia. Drugim istotnym zjawiskiem obserwowanym po odkształceniu w obydwu temperaturach było pojawienie się obszarów zbliźniaczonych, przy czym dominował system zbliźniaczenia na płaszczyźnie {1102}.
Źródło:
Archives of Metallurgy and Materials; 2010, 55, 4; 1007-1019
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:
Mechanical and Thermal Deformation of Hot-box Moulding Sands
Autorzy:
Grabarczyk, A.
Major-Gabryś, K.
Dobosz, S. M.
Jakubski, J.
Powiązania:
https://bibliotekanauki.pl/articles/381390.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry material
innovative foundry technology
mechanical properties
moulding sand deformation
hot distortion
innowacyjny materiał odlewniczy
innowacyjna technologia odlewnicza
właściwości mechaniczne
odkształcenie masy formierskiej
deformacja cieplna
Opis:
The constantly developing and the broadly understood automation of production processes in foundry industry, creates both new working conditions - better working standards, faster and more accurate production - and new demands for previously used materials as well as opportunities to generate new foundry defects. Those high requirements create the need to develop further the existing elements of the casting production process. This work focuses on mechanical and thermal deformation of moulding sands prepared in hot-box technology. Moulding sands hardened in different time periods were tested immediately after hardening and after cooling. The obtained results showed that hardening time period in the range 30-120 sec does not influence the mechanical deformation of tested moulding sands significantly. Hot distortion tests proved that moulding sands prepared in hot-box technology can be characterized with stable thermal deformation up to the temperature of circa 320 °C.
Źródło:
Archives of Foundry Engineering; 2018, 18, 4; 55-58
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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