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Tytuł:
Effect of the Powder Consolidation Method Type on the Microstructure and Selected Properties of Al2O3-Cu-Ni Composite
Autorzy:
Zygmuntowicz, J.
Wachowski, M.
Piotrkiewicz, P.
Kaszuwara, W.
Powiązania:
https://bibliotekanauki.pl/articles/351724.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composites
Pulse Plasma Sintering
Uniaxial Powder Pressing
Scanning Electron Microscopy
Opis:
The present research is focused on the characterization of the composites from Al2O3-Cu-Ni system. Two methods of ceramic-metal composite forming were applied: uniaxial powder pressing and Pulse Plasma Sintering (PPS). To obtain the samples the powder mixtures containing 85 vol.% of Al2O3 and 15 vol.% of metal powders were used. Influence of the sintering process on microstructure and mechanical properties of the two series of the composites was analyzed in detail. The selected physical properties of samples were characterized by Archimedes immersion method. Vickers hardness and the fracture toughness of the composites was determined as well. The microstructure of the composites was characterized by XRD, SEM, EDX. Fractography investigation was carried out as well. Independently on composite production method Al2O3, Cu, Ni, and CuNi phases were revealed. Fractography investigation results revealed different character of fracture in dependence of fabrication method. Pulse Plasma Sintered samples were characterized by higher crack resistance and higher Vickers hardness in comparison to the specimens manufactured by uniaxial pressing.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 967-974
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu mikrostruktury na odporność korozyjną stopu tytanu Ti6Al7Nb
The analysis of the effect of microstructure on the corrosion resistance of titanium alloy Ti6Al7Nb
Autorzy:
Zięty, A.
Lachowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/99013.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
Ti6Al7Nb
biomateriał
mikrostruktura
obróbka cieplna
Ti-6Al-7Nb
biomaterial
microstructure
thermal treatment
Opis:
Stopy tytanu, takie jak Ti6Al4V, czy analizowany Ti6Al7Nb należą do stopów o strukturze dwufazowej α+β. Kształtowanie ich mikrostruktury wynika ze specyficznych cech fizycznych tytanu, ale i z warunków odkształcania na gorąco oraz obróbki cieplnej. Procesy te powinny uwzględniać związek między mikrostrukturą a wytrzymałością implantu, jego twardością, plastycznością, odpornością na zmęczenie, zużycie ścierne i co najważniejsze – odpornością na korozję. Przeanalizowano istniejącą literaturę pod kątem wpływu mikrostruktury stopu tytanu Ti6Al7Nb na jego odporność korozyjną w symulowanych płynach ustrojowych. Jej różnorodność związana jest ze sposobem przetwarzania stopu, co również było obiektem analizy i obserwacji.
Titanium alloys, such as Ti6Al4V, or analyzed in this paper Ti6Al7Nb alloys are two-phase structure of α + β. Shaping their microstructure due to the specific physical characteristics of the titanium, its hot deformation and heat treatment. These processes should take into account the relation between the microstructure and strength of the implant, its hardness, ductility, resistance to fatigue, wear and what is the most important - corrosion resistance. Existing literature was analyzed for effects of titanium alloy microstructure Ti6Al7Nb its corrosion resistance in simulated body fluids. It is associated with a variety of melt processing method, which also has been the subject of analysis and observation.
Źródło:
Aktualne Problemy Biomechaniki; 2014, 8; 187-192
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Long-Term Impact of Elevated Temperature on Changes in Microstructure and Mechanical Properties of HR3C Steel
Autorzy:
Zieliński, A.
Sroka, M.
Hernas, A.
Kremzer, M.
Powiązania:
https://bibliotekanauki.pl/articles/353972.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HR3C steel
high temperature aging
microstructure
mechanical properties
Opis:
The HR3C is a new steel for pressure components used in the construction of boilers with supercritical working parameters. In the HR3C steel, due to adding Nb and N, the compounds such as MX, CrNbN and M23C6 precipitate during service at elevated temperature, resulting in changes in mechanical properties. This paper presents the results of microstructure investigations after ageing at 650, 700 and 750°C for 5,000 h. The microstructure investigations were carried out using scanning and transmission electron microscopy. The qualitative and quantitative identification of the existing precipitates was carried out using X-ray analysis of phase composition. The effect elevated temperature on microstructure and mechanical properties of the examined steel was described.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 761-766
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ długotrwałego oddziaływania temperatury i naprężenia na trwałość eksploatacyjną stali HR3C i jej jednorodnego złącza spawanego
Effect of long-term exposure to temperature and stress on the service life of the HR3C steel and its homogeneous welded joint
Autorzy:
Zieliński, A.
Dobrzański, J.
Rozmus, R.
Kania, Z.
Powiązania:
https://bibliotekanauki.pl/articles/182118.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
pełzanie
mikrostruktura
wydzielenia
creep
microstructure
precipitations
Opis:
Stal HR3C jest nową stalą przeznaczoną do budowy elementów ciśnieniowych kotłów o nadkrytycznych parametrach pracy. W stali tej podczas eksploatacji w podwyższonej temperaturze, dzięki dodatkom Cr, Nb i N wydzielają się związki typu MX, NbCrN i M23C6, co prowadzi do zmiany właściwości mechanicznych. W pracy przedstawiono wyniki badań mikrostruktury po starzeniu tej stali w temperaturze 650, 700 i 750°C w czasie do 10 000 godz. Badania mikrostruktury przeprowadzono przy użyciu skaningowej i transmisyjnej mikroskopii elektronowej. Identyfikację jakościową i ilościową występujących wydzieleń wykonano metodą rentgenowskiej analizy fazowej. Opisano wpływ podwyższonej temperatury na zmiany w mikrostrukturze badanej stali. Przeprowadzono skrócone próby pełzania. Uzyskane wyniki stanowią podstawę charakterystyk materiałowych stali nowej generacji, które są wykorzystane w diagnostyce materiałowej elementów części ciśnieniowej kotłów energetycznych.
HR3C steel is a new steel designed for the construction of pressure components for boilers with supercritical performance. In this steel, during operation at elevated temperatures, the compounds MX, NbCrN and M23C6 are released due to the addition of Cr, Nb and N, leading to a change in mechanical properties. The paper presents the results of microstructure studies after ageing of this steel at 650, 700 and 750°C for up to 10,000 hours. Microstructure studies were carried out using scanning and transmission electron microscopy. Qualitative and quantitative identification of the occurring precipitations was carried out using X-ray phase analysis. The effect of elevated temperature on chan ges in the microstructure of the investigated steel is described. Shortened creep tests were carried out. The obtained results are the basis for material characteristics of the new generation steel used in material diagnostics of pressure components of power boilers.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2017, T. 69, nr 2, 2; 48-57
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Power Ultrasound on Microstructure Evolution During the Transient Liquid Stage of Ultrasonic-Promoted TLP Bonding SiCp/Al MMCs
Autorzy:
Zhou, Changzhuang
Ma, Lin
Zhu, Chao
Cui, Qinghe
Liang, Jindi
Song, Yujian
Powiązania:
https://bibliotekanauki.pl/articles/2174569.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transient liquid phase bonding
silicon carbide reinforced aluminum matrix composites
ultrasonics
zinc interlayer
Opis:
Ultrasound-promoted transient liquid phase bonding (U-TLP) is a high quality, high efficiency, and low-cost method for fast bonding of difficult-wetting materials in the atmospheric environment. In this paper, U-TLP was used to bond SiC particles reinforced aluminium-based metal matrix composite which particle volume fraction was 70%. The pure zinc foil was used as the intermediate layer. The effects of ultrasonic on microstructure evolution and mechanical properties of joints during the transient liquefaction stage were investigated. The mechanism of ultrasonic effects in the transient liquefaction stage of U-TLP was also inducted. The results showed that high volume fraction SiCp/Al MMCs were bonded well at low temperature in the air environment. Ultrasonic vibration can remove the oxide film on the surface of aluminum matrix composites, enhance the wettability of SiC particles with weld metal, promote atomic diffusion and homogenization of SiC particles, and improve the welding quality and efficiency. Reasonable increase of ultrasonic vibration time could effectively improve the joint strength.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1283--1291
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Sulfur and Acid Soluble Aluminum Content on Precipitate and Microstructure of Grain-Oriented Silicon Steel
Autorzy:
Zhou, B.
Zhu, C.
Li, G.
Luo, Z.
Gao, Y.
Bao, S.
Schneider, J.
Powiązania:
https://bibliotekanauki.pl/articles/354451.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grain oriented silicon steel
sulfur
acid soluble aluminum
precipitate
microstructure
texture
Opis:
The combined effect of sulfur (S) and acid soluble aluminum (Als ) content on precipitates and microstructures in grain-oriented silicon steel were investigated. The results show that there are dominant AlN and a little amount of MnS-AlN composite in annealed hot-rolled band, and the amount of precipitates increases distinctly with increasing Als content, while S content plays a negligible role. The inhibitors that precipitate during hot band annealing can restrain the grain growth during hot band annealing and primary annealing, and the smaller grains of annealed hot-rolled band can contribute to the formation of {111} <112> texture during primary annealing. Lower S content is conducive to the formation of {111} <112> texture during primary annealing by promoting the formation of Goss texture during hot rolling.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1701-1708
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cryogenic Treatment on Wear Resistance and Microstructure of 42CrMo Steel
Autorzy:
Zhang, Haidong
Yan, Xianguo
Chen, Zhi
Zhao, Minna
Tang, Liang
Gao, Yuan
Li, Fan
Huang, Yao
Li, Junji
Powiązania:
https://bibliotekanauki.pl/articles/2048794.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cryogenic treatment
orthogonal design method
hardness
coefficient of friction
wear resistance
microstructure
Opis:
In this work, thermo-mechanically treated 42CrMo steel was subjected to cryogenic treatment conducted by means of orthogonal design method, followed by low-temperature tempering to investigate the effect of different parameters of cryogenic treatment on wear resistance of 42CrMo steel and to optimize parameters of cryogenic treatment for improving wear resistance. The results of hardness test and wear test show that cryogenic treatment significantly improves wear resistance with marginal changes in coefficient of friction and hardness. Specifically, cryogenic temperature has the largest impact on wear resistance of 42CrMo steel, holding time has medium impact, and the parameter of treatment cycles has the least impact. The optimum parameters of cryogenic treatment are -196°C for 12 hours with one cycle for improving wear resistance. The results of scanning electron microscopy (SEM) and X-ray diffractometry (XRD) analysis indicate that marginal changes in hardness and coefficient of friction may be owing to little amount of transformation of retained austenite, and the significant influence of cryogenic treatment on improving wear resistance of 42CrMo steel can be mainly attributed to segregation of carbon atoms promoted by cryogenic treatment resulting in more precipitation of carbides in subsequent tempering.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 127-135
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Element Addition, Microstructure Characteristics, Mechanical Properties, Machining and Welding Processes of the Hadfield Austenitic Manganese Steel
Autorzy:
Zellagui, Rihab
Hemmouche, Larbi
Ait-Sadi, Hassiba
Chelli, Amel
Powiązania:
https://bibliotekanauki.pl/articles/2125536.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Hadfield steel
austenite
carbides
element addition effect
machinability
welding
Opis:
High manganese steel, also called Hadfield steel, is an alloy essentially made up of iron, carbon, and manganese. This type of steel occupies an important place in the industry. It possesses high impact toughness and high resistance against abrasive wear and hardens considerably during work hardening. The problem with this kind of steel is the generation of carbides at the grain boundaries after the casting. However, heat treatment at the high-temperature range between 950°C and 1150°C followed by rapid quenching in water is proposed as a solution to remove carbides and obtain a fully austenitic structure. Under the work hardening effects, the hardness of Hadfield steel increases greatly due to the transformation of the austenite γ to martensite ε or α and mechanical twinning, which acts as an obstacle for sliding dislocations. Hot machining is the only solution to machine Hadfield steel adequately without damage of tools or changing the mechanical characteristics of the steel. The choice of welding parameters is important to prevent the formation of carbides and obtain welded steel with great characteristics. This paper aims to give an overview about Hadfield steel, element addition effect, microstructure, heat treatments, work hardening, machinability and welding processes.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 863--868
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of plant-meat blends composition and extrusion temperature on the physical properties of extrudates
Wpływ składu surowcowego mieszanek roślinno-mięsnych i temperatury ekstruzji na właściwości fizyczne ekstrudatów
Autorzy:
Zarzycki, P.
Rzedzicki, Z.
Sobota, A.
Pawlas, A.
Powiązania:
https://bibliotekanauki.pl/articles/35434.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
plant-meat blend
pulp composition
extrusion
microstructure
feed quality
temperature
physical property
extrudate
Opis:
The study was concerned with the effect of the percentage share of meat material, plant material and extrusion temperature on the process run and physical properties of extrudates. Meat-bone pulp (MBP) from mechanical de-boning of poultry carcasses, faba bean wholemeal, and barley grain meal were used in this study. The extrusion process was conducted using a twin-screw extruder with counter-rotating conical screws. It was demonstrated that the extruder used in this study permits the processing of blends with up to 25% meat-bone material content. The extrudates obtained were characterised by a loose, gritty-like granular form. Pellet durability index (PDI) of extrudates ranged from 60.30 to 96.24%. Increase in the content of MBP caused a decrease of PDI. Increase of the percentage share of MBP from 5 to 10% caused an increase of the water absorption index (WAI). However, no clear pattern was observed for WAI value as a result of increases in MBP above the 10% level. Likewise, no significant effect of MBP on the water solubility index (WSI) was noted. Extrusion temperature increase from 130 to 250°C caused an increase in PDI. Analysis of microstructure revealed a significant effect of process temperature on the structure of extrudates. At higher temperatures the formation of fibrous structures was observed, that might be responsible for increasing the PDI. Only slight, but statistically significant changes in the values of WSI and WAI, caused by process temperature change, were noted.
Celem przeprowadzonych badań było określenie wpływu udziału surowca mięsnego w połączeniu z surowcami roślinnymi oraz temperatury ekstruzji na przebieg procesu oraz właściwości fizyczne ekstrudatów. W badaniach wykorzystano miazgę mięsno-kostną (MBP) pochodzącą z mechanicznego odkostniania tuszek drobiowych oraz razówkę bobikową i jęczmienną. Ekstruzję przeprowadzono z wykorzystaniem przeciwbieżnego ekstrudera dwuślimakowego. Wykazano możliwość przetwarzania mieszanek z udziałem miazgi mięsno kostnej dochodzącym do 25%. Uzyskane ekstrudaty charakteryzowały się luźną, kaszkowatą formą. Wskaźnik wytrzymałości kinetycznej (PDI) ekstrudatów mieścił się w zakresie od 60,30 do 96,24%. Zwiększenie udziału MBP w mieszankach powodowało obniżenie wytrzymałości kinetycznej ekstrudatów. Wzrost udziału MBP w mieszankach, z 5 do 10%, spowodował zwiększenie wodochłonności ekstrudatu (WAI). Nie odnotowano jednoznacznego wpływu MBP, przy jej udziale w mieszance powyżej 10%, na wartość WAI ekstrudatów. Nie wykazano, także istotnych zależności pomiędzy zawartością MBP a współczynnikiem rozpuszczalności suchej masy (WSI) ekstrudatów. Wzrost temperatury ekstruzji ze 130 do 250°C spowodował wzrost PDI. Analiza mikrostruktury wykazała istotny wpływ temperatury procesu na strukturę ekstrudatów, obserwowano m. in powstawanie struktur włóknistych w wyższych temp. procesu, mogących odpowiadać za zwiększenie wartości PDI ekstrudatów. Odnotowano nieznaczne, statystycznie istotne (Duncan, p ≤ 0,05), zmiany wartości WSI i WAI wywołane zmianą temp. procesu.
Źródło:
Acta Agrophysica; 2016, 23, 4
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Strain Rate on the Microstructure of Warm-Deformed Ultrafined Medium-Carbon Steel
Autorzy:
Yuan, Q.
Xu, G.
Liu, S.
Liu, M.
Hu, H.
Powiązania:
https://bibliotekanauki.pl/articles/355659.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
warm deformation
medium-carbon steel
ultrafine grain
strain rate
Fe3C
Opis:
In this study, medium-carbon steel was subjected to warm deformation experiments on a Gleeble 3500 thermosimulator machine at temperatures of 550°C and 650°C and strain rates of 0.001 s-1 to 1 s-1. The warm deformation behavior of martensite and the effects of strain rate on the microstructure of ultrafine grained medium-carbon steel were investigated. The precipitation behavior of Fe3C during deformation was analyzed and the results showed that recrystallization occurred at a low strain rate. The average ultrafine ferrite grains of 500 ± 58 nm were fabricated at 550°C and a strain rate of 0.001 s-1. In addition, the size of Fe3C particles in the ferrite grains did not show any apparent change, while that of the Fe3C particles at the grain boundaries was mainly affected by the deformation temperature. The size of Fe3C particles increased with the increasing deformation temperature, while the strain rate had no significant effect on Fe3C particles. Moreover, the grain size of recrystallized ferrite decreased with an increase in the strain rate. The effects of the strain rate on the grain size of recrystallized ferrite depended on the deformation temperature and the strain rate had a prominent effect on the grain size at 550°C deformation temperature. Finally, the deformation resistance apparently decreased at 550°C and strain rate of 1 s-1 due to the maximum adiabatic heating in the material.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1805-1813
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cooling Rates and Intermediate Slab Blank Thickness on the Microstructure and Mechanical Properties of the X70 Pipeline Steel
Autorzy:
Xu, Haijian
Han, Chufei
Yan, Pingyuan
Zhao, Baochun
Li, Weijuan
Powiązania:
https://bibliotekanauki.pl/articles/28099617.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
cooling rate
microstructure
pipe steel
acicular ferrite
low-alloy
Opis:
In this study, the microstructures and mechanical properties of X70 pipeline steels produced with varying Mo contents, accelerated cooling rate and intermediate slab blank thickness are systematically investigated. Results showed that the microstructures and mechanical properties of the X70 pipeline steels were strongly affected by Mo addition. The pearlite and proeutectoid ferrite formation is obviously inhibited in containing-Mo steel and the acicular ferrite (AF) is obtained in a wide range of cooling rates. With the increasing the cooling rates, the AF constituent amount increases. The grains can be refined by increasing the thickness of intermediate slab for enhancing the cumulative reduction rates, and meanwhile increase the number density of precipitates. It was proved by simulation and industrial trials that the low-alloy X70 pipeline steels can be produced increasing cooling rates and the thickness of intermediate slab without strength and toughness degradation which also reduce alloy cost.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 649--658
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of rapid solidification aluminum alloys with different Si contents on mechanical properties and microstructure
Wpływ szybkiej krystalizacji stopów aluminium z różną zawartością Si na własności mechaniczne oraz mikrostrukturę
Autorzy:
Wzorek, Ł.
Wiewióra, M.
Wędrychowicz, M.
Skrzekut, T.
Noga, P.
Wiewióra, J.
Sajdak, W.
Richert, M.
Powiązania:
https://bibliotekanauki.pl/articles/264299.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
solid bonding
rapid solidification
hot extrusion
konsolidacja plastyczna
szybka krystalizacja
wyciskanie na gorąco
Opis:
Rapid solidification is a relatively new and effective way of producing ultrafine-grained UFG aluminum alloys with enhanced mechanical properties. Due to a significant cooling rate close to nearly 106 K/s, it is possible to obtain a material with grain size far below 100 nm. In the present study, RS aluminum alloys with an Si content in a range of 5–10 wt% were produced during melt spinning. As a result, materials in the form of ribbons were produced. The as-received flakes were subjected to cold pressing into cylindrical billets with a diameter of 40 mm. Hot extrusion of pre-compacted material was subsequently performed at a temperature of 450°C with a press ram speed of 3 mm/s and extrusion ratio of λ = 25. In this work, the influence of brittle phases on the mechanical properties of as-extruded rods will be examined. Both tensile and microhardness tests were performed in order to determine the mechanical properties of the obtained profiles. It has been shown that brittle-phase refinement during melt spinning significantly influences the mechanical properties of the tested materials.
W wyniku szybkiej krystalizacji możliwe jest otrzymanie struktury drobnoziarnistej stopów aluminium o podwyższonych własnościach mechanicznych. Znaczna szybkość chłodzenia na poziomie 106 K/s umożliwia otrzymanie wielkości ziarna na poziomie 100 nm. W prezentowanych w pracy badaniach szybkiej krystalizacji poddano stopy aluminium o zawartości 5 oraz 10% wagowych Si. Otrzymane taśmy poddano wstępnemu prasowaniu na zimno do form brykietów o średnicy 40 mm. Proces wyciskania przeprowadzono w temperaturze 450°C z prędkością tłoka równą 3 mm/s. Stopień przerobu wynosił λ = 25. W niniejszym opracowaniu badano wpływ kruchych faz na własności mechaniczne wyciskanych prętów. W tym celu wykonano próbę jednoosiowego rozciągania oraz pomiary mikrotwardości otrzymanych profili. Wykazano znaczny wpływ rozdrobnienia kruchych faz podczas szybkiej krystalizacji na własności mechaniczne badanych materiałów.
Źródło:
Metallurgy and Foundry Engineering; 2016, 42, 3; 179-186
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Cooling Rate after Homogenization on the Microstructure and Properties of 2017a Alloy Billets for Extrusion with Solution Heat Treatment on the Press
Autorzy:
Woźnicki, A.
Leśniak, D.
Włoch, G.
Pałka, P.
Leszczyńska-Madej, B.
Wojtyna, A.
Powiązania:
https://bibliotekanauki.pl/articles/355500.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
2017A alloy
cooling rate after homogenization
θ (Al2Cu) phase particles precipitation
Opis:
The influence of cooling rate after homogenization on the 2017A alloy microstructure was analysed. The capability of the θ (Al2Cu) particles, precipitated during various homogenization coolings, for rapid dissolution was estimated. For this purpose, the DSC test was used to determine the effect of the cooling rate after homogenization on the course of melting during a rapid heating. Moreover, the samples after solution heat treatment (with short time annealing) and ageing, were subjected to the microstructure investigations and the microhardness of grains interiors measurements. It was found that cooling after homogenization at 160 °C/h is sufficient for precipitation of fine θ phase particles, which dissolve during the subsequent rapid heating. The cooling at 40 °C/h, causes the precipitation of θ phase in the form of large particles, incapable of further fast dissolution.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1663-1670
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel
Autorzy:
Wojtach, A.
Opiela, M.
Powiązania:
https://bibliotekanauki.pl/articles/2023786.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microstructure
multi-phase steels
CCT diagram
supercooled austenite
mikrostruktura
stale wielofazowe
diagram CCT
austenit przechłodzony
Opis:
The paper presents the results of research on the influence of plastic deformation and cooling conditions on microstructure, hardness and a shape of CCT-diagram (Continuous Cooling Transformations) of newly developed multi-phase steel assigned for die forgings, combining high strength, crack resistance and fatigue strength. The diagrams of undeformed and plastically deformed supercooled austenite transformations of steel, containing 0.175% C, 1.87% Mn, 1.0% Si, 0.22% Mo as well as Ti and V microadditions in concentration of 0.031% and 0.022%, respectively, were determined. Dilatometric tests were performed using a Bahr 805 A/D dilatometer. Specimens were austenitized at the temperature of 1000°C for 300 s and successively cooled to ambient temperature at a rate ranging from 60°C/s to 0.1°C/s. In order to determine the influence of plastic deformation on the shape of CCT-diagram, samples were deformed at the temperature of 1000°C, using a 50% degree of deformation, and then cooled in the same rate range as the samples which were not plastically deformed. The tests showed the following temperature results: Ac3 = 960°C, Ac1 = 832°C and a relatively low MS temperature equal 330°C. Plastic deformation of steel at the temperature of 1000°C, prior to the beginning of phase transformations, leads to significant increase in the ferritic transformation range, shifting the temperature of the beginning of this transformation to higher temperature in the entire range of cooling rates. It was also revealed that the specimens, plastically deformed at the austenitizing temperature, exhibit higher hardness compared to the specimens which were not plastically deformed, cooled with the same cooling rate. The elaborated CCT-diagrams of supercooled austenite transformations constitute the basis for correct development of the conditions of thermo-mechanical treatment of forgings from the tested steel.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 4; 72-80
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Casting Die Cooling on Solidification Process and Microstructure of Hypereutectic Al-Si Alloy
Autorzy:
Władysiak, R.
Kozuń, A.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/380676.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technology
innovative foundry material
casting die cooling
water mist
hypereutectic silumin
innowacyjna technologia odlewnicza
innowacyjny materiał odlewniczy
odlewanie kokilowe
mgła wodna
silumin nadeutektyczny
Opis:
The work is a continuation of research concerning the influence of intensive cooling of permanent mold in order to increase the casting efficiency of aluminium alloys using the multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of synthetic hypereutectic alloys: AlSi15 and AlSi19. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified silumins on the research station allowing the cooling of the special permanent probe using a program of computer control. Furthermore the study used a thermal imaging camera to analyze the solidification process of hypereutectic silumins. The study demonstrated that the use of mold cooled with water mist stream allows in wide range the formation of the microstructure of hypereutectic silumins. It leads to higher homogeneity of microstructure and refinement of crystallizing phases and also it increases subsequently the mechanical properties of casting.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 175-180
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 275

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