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Wyświetlanie 1-15 z 28
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:
Austenite Grain Size Estimtion from Chord Lengths of Logarithmic-Normal Distribution
Autorzy:
Adrian, H.
Wiencek, K.
Powiązania:
https://bibliotekanauki.pl/articles/352085.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austenite grain size
linear section methods
modelling
Opis:
Linear section of grains in polyhedral material microstructure is a system of chords. The mean length of chords is the linear grain size of the microstructure. For the prior austenite grains of low alloy structural steels, the chord length is a random variable of gamma- or logarithmic-normal distribution. The statistical grain size estimation belongs to the quantitative metallographic problems. The so-called point estimation is a well known procedure. The interval estimation (grain size confidence interval) for the gamma distribution was given elsewhere, but for the logarithmic-normal distribution is the subject of the present contribution. The statistical analysis is analogous to the one for the gamma distribution.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2015-2019
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Grain Size on the Mechanical Damping Behavior of Aluminum
Autorzy:
Jang, Haneul
Choi, Kwangmin
Shin, Jaehyuck
Bae, Donghyun
Choi, Hyunjoo
Powiązania:
https://bibliotekanauki.pl/articles/352557.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al
tensile properties
damping behavior
grain size
Opis:
An understanding of the fundamental correlation between grain size and material damping is crucial for the successful development of structural components offering high strength and good mechanical energy absorption. With this regard, we fabricated aluminum sheets with grain sizes ranging from tens of microns down to 60 nm and investigated their tensile properties and mechanical damping behavior. An obvious transition of the damping mechanism was observed at nanoscale grain sizes, and the underlying causes by grain boundaries were interpreted.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 475-479
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The equal channel angular extrusion process of multiphase high strength aluminium bronze
Proces równokanałowego wyciskania kątowego wysokowytrzymałych wielofazowych brązów aluminiowych
Autorzy:
Gronostajski, Z.
Hawryluk, M.
Kuziak, R.
Radwański, K.
Skubiszewski, T.
Zwierzchowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/355856.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium bronzes
ECAP
strain
microstructure
grain size
Opis:
The aim of the research was to determine the deformation condition of ECAP process of multiphase high strength aluminium bronze BA1032. The studies have indicated that it is possible to deform multiphase aluminium bronze BA1032 in the ECAP process at a temperature of 400°C and die angle Φ=110°. The deformation of the bronzes at lower temperatures encounters some difficulties - cracks appear which make repeated ECAP impossible. The cracks appear on the top surface of the samples where it contacts the surface of the outlet channel. FEM simulations show that the largest plastic strains occur in this area. The proposed ECAP method of large plastic deformations as applied to the investigated aluminium bronzes makes it possible to obtain very strong refinement especially of eutectoid α+ γ2.
Celem pracy było określenie warunków odkształcania w procesie ECAP wysokowytrzymałych wielofazowych brązów aluminiowych. Przeprowadzone badania wskazują na możliwość odkształcania wielofazowych brazów aluminiowych w tym procesie w temperaturze 400 °C dla kąta matrycy Φ=110°. Pewne trudności sprawia odkształcanie brązu w niższych temperaturach, gdyż pojawiają się wówczas pęknięcia, które uniemożliwiają prowadzenie procesu wielokrotnego przeciskania próbek przez kanał katowy. Pęknięcia pojawiaja sie na górnej powierzchni próbek w miejscu kontaktu z powierzchnią kanału wyjsciowego. Jak wykazuje symulacje MES w miejscu tym występują największe odkształcenia plastyczne. Zastosowana metoda dużych odkształceń plastycznych ECAP w przypadku badanych brazów aluminiowych pozwala uzyskać bardzo silne rozdrobnienie głównie eutektoidu α+ γ 2.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 4; 897-909
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Repeated Austenitisation and Cooling on the Microstructure, Hardness and Tensile Behaviour of 0.16 wt % Carbon Steel
Autorzy:
Subhani, A. R.
Mondal, D. K.
Powiązania:
https://bibliotekanauki.pl/articles/355808.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ferrite grain size
pearlite degeneration
hardness
tensile behaviour
Opis:
Repeated austenitisation and furnace cooling of homogenised 0.16 wt. % carbon steels result in ferrite grain sizes between 27 μm and 24 μm. Similarly, repeated austenitisation and normal-air cooling produces ferrite grain sizes between 17 μm and 12 μm; while repeated austenitisation and forced-air cooling produces a minimum grain size of 9.5 μm. Furnace cooling decomposes the austenite eutectoidally to lamellar pearlite; while normal-air cooling and forced-air cooling after austenitisation cause degen eration of pearlite regions producing grain boundary network as well as cluster of cementite and other carbides. Forced-air cooled samp les provide the highest YS (364 MPa) and UTS (520 MPa); while furnace cooling provides the lowest (290 MPa and 464 MPa) leaving the normal-air cool performance in between. Hardness values depict the role of individual ferrite and pearlite content and the extent of pearlite degeneration occurring after each cyclic treatment.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1141-1152
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Effect of Granulometric Features on the Permeability of No-Bake Resin Bonded Sand Cores
Autorzy:
Hudák, H.
Gyarmati, G.
Varga, L.
Powiązania:
https://bibliotekanauki.pl/articles/1837703.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry sand
granulometric features
grain size
grain morphology
grain shape
permeability
Opis:
Foundry sand is the main element of sand mixtures from which molds or sand cores are made. Due to the continuous development of core making technologies, the selection of the right type of base sand becomes more and more important. The major features of foundry sand are determined by the following factors: chemical and mineralogical composition, sand grain size, grain size distribution, sand grain shape, and surface quality. The main goal of our research was to develop a qualification method that can be used to predict the characteristics of sand cores made from different sand types. Samples made from different types of foundry sand were used during the research whose properties were examined with a new qualification system, and then its connection with the gas permeability of sand cores was analyzed. Based on the research results, a strong correlation could be established between the suggested quality indicators: CQi (Core Quality Index), CG (Coefficient of Granulometry), and permeability.
Źródło:
Archives of Foundry Engineering; 2021, 21, 2; 99-105
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative Study on the Mechanical and Corrosion Properties of the ZM20 and ZM21 Alloys after Casting and Rolling
Autorzy:
Gören, Halil Ahmet
Ünal, Mehmet
Türen, Yunus
Ahlatçı, Hayrettin
Sun, Yavuz
Powiązania:
https://bibliotekanauki.pl/articles/2174591.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grain size
Hall-Petch relationship
yield stress
corrosion
magnesium
Opis:
In this study, the effects of grain refinement and production methods on the corrosion, corrosive wear and mechanical properties of the as-cast and as-rolled Mg-2 wt.% Zn (ZM20) and Mg-2 wt.% Zn-0,51 wt.% Mn (ZM21) alloys were examined by using OM, XRD, SEM, hardness and uniaxial tensile test. Additionally, the potentiodynamic polarization, immersion corrosion test and corrosive wear properties of the ZM20 and ZM21 alloys were compared. According to the XRD results, MgZn and MgZn2 phases were found in the alloys and also MnZn3 phase occurred in the ZM21 alloy with the addition of manganese. Both during solidification forming nucleation points with the added manganese and during rolling the broken secondary phase particles distributed into the matrix prevented grain growth and led to the formation of a more refined structure. The tensile test results showed that the strength of the as-cast ZM21 alloys were better than that of the as-cast ZM20 alloys and further improvement in mechanical properties occurred with the rolling of the both alloys. The most superior hardness was found in the as-rolled ZM21 alloy. In the total 400-m reciprocal corrosive wear test in the 3.5% NaCl solution, the lowest mass loss was in the as-rolled ZM21 alloys. In the potentiodynamic corrosion test, the highest corrosion resistance was occurred by the as-cast ZM20 alloy.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1387--1394
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Zirconium on the Solidification Path and Structural Properties of Commercial AlSi10MgCu Alloys
Autorzy:
Hajduch, P.
Djurdjevic, M. B.
Bolibruchová, D.
Simicevic, Z.
Powiązania:
https://bibliotekanauki.pl/articles/351378.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zirconium
AlSi10MgCu alloy
grain size
SDAS
porosity
Opis:
Comprehensive understanding of the melt quality is of vital importance for foundry man. The effect of each particular element need to be properly analysed. Therefore, the aim of this paper was to analyse the impact of various content of zirconium on the solidification path and structural characteristics (SDAS, grain size, porosity) of as cast commercial AlSi10MgCu alloys. It has been found that addition of zirconium up to 0.24 wt.% reduce significantly the grains size (from 3.5 mm to 1.2 mm), SDAS (from 57.3 μm to 50.4 μm) and porosity (from 19% to 5%), leading to production of sound cast parts.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 549-554
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of Thermal Conductivity Through Complex Microstructure by Dispersion of Carbon Nanofiber in p-Type Bi0.5Sb1.5Te3 Alloys
Autorzy:
Sharief, P.
Madavali, B.
Sohn, Y.
Han, J. H.
Song, G.
Hong, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/2049341.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bismuth telluride
carbon nano fiber
grain size
Thermal conductivity
ZT
Opis:
The influence of nano dispersion on the thermoelectric properties of Bi2Te3 was actively investigating to wide-spread thermoelectric applications. Herein this report, we have systematically controlled the microstructure of Bi0.5Sb1.5Te3 (BST) alloys through the incorporation of carbon nanofiber (CNF), and studied their effect on thermoelectric properties, and mechanical properties. The BST/x-CNF (x-0, 0.05, 0.1, 0.2 wt.%) composites powder was fabricated using high energy ball milling, and subsequently consolidated the powder using spark plasma sintering. The identification of CNF in bulk composites was analyzed in Raman spectroscopy and corresponding CNF peaks were recognized. The BST matrix grain size was greatly reduced with CNF dispersion and consistently decreased along CNF percentage. The electrical conductivity was reduced and Seebeck coefficient varied in small-scale by embedding CNF. The thermal conductivity was progressively diminished, obtained lattice thermal conductivity was lowest compared to bare sample due to induced phonon scattering at interfaces of secondary phases as well as highly dense fine grain boundaries. The peak ZT of 0.95 achieved for 0.1 wt.% dispersed BST/CNF composites. The Vickers hardness value of 101.8 Hv was obtained for the BST/CNF composites.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 803-808
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Impact Toughness of Offshore Steel
Autorzy:
Cheng, T.-C.
Yu, C.
Yang, T.-C.
Huang, C.-Y.
Lin, H.-C.
Shiue, R.-K.
Powiązania:
https://bibliotekanauki.pl/articles/351264.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low-temperature impact toughness
prior austenite grain size
hardenability
bainite
Opis:
This study focused on the effects of microstructures on the low-temperature impact toughness of directly water-quenched offshore steel. Martensite dominated the microstructure directly below the quenched surface. In contrast, mainly lower bainite, martensite, and low amount of ferrite were observed in the central region of the quenched specimen. The ductile to brittle transition temperature of tempered martensite was significantly lower than that of a bainite-dominated microstructure. It is found that low-angle boundaries within the bainite packets greatly impair the low-temperature impact toughness of the steel. The absence of high-angle boundaries in the lower bainite packets significantly deteriorates the low-temperature impact energy of offshore steel.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 167-172
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of phase transition in Bi3TiNbO9-BaBi2Nb2O9 ceramics
Autorzy:
Adamczyk, M.
Kusz, J.
Hofmeister, W.
Zubko, M.
Kozielski, L.
Pilch, M.
Bochenek, D.
Wodecka-Duś, B.
Powiązania:
https://bibliotekanauki.pl/articles/353210.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dielectric properties
X-ray methods
grain size
phase transition
ceramics
Opis:
The subject of the paper is lead free bismuth layer structure oxides (1-x)Bi3TiNbO9-xBaBi2N2O9(x=0; 1; 2; 3 mol). The influence of Bi3TiNbO9/BaBi2Nb2O9 ratio on dielectric and structural properties was studied in a wide range of temperatures. Change in the ratio causes a decrease in the maximum value of dielectric permittivity and shifts the temperature of ε`max to low values, leading to linear decreasing of average grain size and linear increasing of ceramics density. These results indicate an augment of the packing degree and the participation of pores are significantly decreased with the increase of BaBi2Nb2O9compound intake. Moreover, for 0.7Bi3TiNbO9-0.3BaBi2Nb2O9 ceramics the dielectric phase transition is broadened and the properties characteristic for the ferroelectric relaxor appear.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1503-1510
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model for abnormal grain growth in nano-crystalline materials based on Zener drag force
Model nieprawidłowego wzrostu ziarna w materiałach nanokrystalicznych oparty o siłę pędną Zenera
Autorzy:
Razavi-Tousi, S. S.
Yazdani-Rad, R.
Manafi, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/354897.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rozmiar ziaren
nieprawidłowy wzrost ziarna
nanokrystaliczne materiały
grain size
abnormal grain growth
nanocrystalline
Opis:
Abnormal grain growth of a matrix in which normal grain growth has stagnated due to the presence of fine incoherent ceramic particles is studied. A balance between driving and retarding forces is used as the criteria for estimating the steady state. Random and non-random approaches are applied for coarse and nano-grained structure respectively.
Badano nieprawidłowy wzrost ziaren w materiale, w którym prawidłowy wzrost ziaren został zahamowany z powodu obecności drobnych cząsteczek ceramicznych. Równowaga pomiędzy siłami pędną i opóżniającą zostały przyjęte jako kryterium oszacowania stanu równowagi. Zastosowano przypadkowe i nieprzypadkowe podejście odpowiednio do struktury grubo i drobnoziarnistej.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 1; 79-85
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative Evaluation of the Microstructure and Mechanical Properties of Hot Rolled 23MnB4 Steel Grade for Cold Upsetting
Autorzy:
Kuc, D.
Szala, J.
Bednarczyk, I.
Powiązania:
https://bibliotekanauki.pl/articles/350971.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
23MnB4 steel
hot rolling
microstructure
quantitative metallography
grain size
Opis:
The article presents the results of tests of influence of the thermo-mechanical treatment parameters on the mechanical properties and microstructure of steel 23MnB4 for cold-upsetting. Measurements of the ferrite grains and pearlite colonies were conducted with the use of Met-Ilo program supplemented by additional procedures dedicated to structure analysis of ferritic-pearlitic steel. The process of rolling was conducted in simulation in semi-continuous finishing train arrangement with different temperature and cooling rate. Elaborated procedure of quantitative analysis of microstructure and conducted mechanical properties tests will be used during preparations of modified technologies of wire rod rolling to prepare products made of steel, the microstructure of which is characterised higher utility properties.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 551-556
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Destruction Degree of the Quartz Matrix in the REGMAS Reclaimer
Autorzy:
Skrzyński, M.
Dańko, R.
Powiązania:
https://bibliotekanauki.pl/articles/381682.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reclamation
moulding sand
grain size analysis
destruction
rekultywacja
masa formierska
analiza uziarnienia
Opis:
The results of investigations of the influence of operation parameters of the prototype vibratory REGMAS reclaimer on matrix grains refinement (destruction) are presented in the paper. Fresh quartz sand ‘Szczakowa’ –1K 0.40/0.32/0.20, J88, >1400oC, WK= 1.20 was subjected to the treatment. Examinations were performed in three stages differing in the frequency of electrovibrators operations (which was: 40 Hz, 50 Hz and 60 Hz). For each frequency two settings of the exciting force of the rotodynamic drives were applied. They were equal 42% and 75% of the maximal exciting force. The sand batch placed in the bottom part of the REGMAS reclaimer was, in individual stages, subjected to elementary operations of grinding, rubbing and crushing. The destruction ratio was determined by means of the classic sieve analysis and grain size analysis performed in the Analysette 22NanoTec apparatus.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 17-22
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Heating Parameters on Flow Stress Curves of Low-Alloy Mn-Ti-B Steel
Autorzy:
Kawulok, P.
Schindler, I.
Kawulok, R.
Opěla, P.
Sedláček, R.
Powiązania:
https://bibliotekanauki.pl/articles/354445.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
initial austenition grain size
peak stress
peak strain
Mn-Ti-B steel
Opis:
Influence of the initial grain size on hot deformation behavior of the low-alloy Mn-Ti-B steel was investigated. The uniaxial compression tests were performed in range of the deformation temperatures of 900-1200°C and strain rates of 0.1-10 s-1. One set of samples was heated directly to the deformation temperature, which corresponded to the initial austenitic grain size of 19-56 μm; the other set of samples was uniformly preheated at the temperature of 1200°C. Whereas the values of activation energy, peak stress and steady-state stress values practically did not depend on the initial austenitic grain size, the peak strain values of coarser-grained structure significantly increase mainly at high values of the Zener-Hollomon parameter. This confirms the negative effect of the large size of the initial grain on the dynamic recrystallization kinetics, which can be explained by the reduction in nucleation density.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1785-1792
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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