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Wyświetlanie 1-15 z 281
Tytuł:
The effect of annealing and anisotropic behaviour on tensile and fatigue properties of AA 8090
Autorzy:
Abass, M. H.
Mahmud, F.
Alali, M. S.
Abood, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/378497.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
AA 8090
anisotropic behavior
annealing
tensile strength
fatigue strength
AA8090
zachowanie anizotropowe
wyżarzanie
wytrzymałość na rozciąganie
wytrzymałość zmęczeniowa
Opis:
Purpose: This paper aims to assess microstructures and mechanical properties of annealed and un-annealed Al-Li alloys (AA8090) and provide valid information regarding influence of anisotropy on tensile properties, fatigue lives. Design/methodology/approach: The methodology included investigating the influence of annealing on grain size, tensile strength and fatigue lives of AA8090. Optical microscope, scanning electron microscope and X-ray diffraction were utilized to analyse the crystallographic texture. Findings: The results showed that the un-annealed alloy exhibited much finer grain structure in three directions, namely longitudinal (L) rolling direction, L-45° and Long transverse (LT) combined with stronger crystallographic texture. Regarding to mechanical properties, un-annealed alloy presented superior tensile strength with strong anisotropic behaviour. L and LT grains direction showed highest tensile strength value of 550 MPa and L-45° showed lowest tensile strength value of 420 MPa. Results of fatigue test revealed that annealed Al-Li alloy has lower fatigue lives with high influence of test direction on fatigue properties. Higher variation in fatigue life to failure links with un-annealed alloy over annealed alloy. Examination of fractured surface showed that the morphology of fractured surface is a mixture of ductile and brittle fractures in both annealed and un-annealed alloys with more brittle behaviour in un-annealed alloy. Research limitations/implications: The main challenge of this work is the determination of the test direction (test angle in respect to rolling direction), which is necessary to provide correct information regarding mechanical properties. Further study of low cycle fatigue can be done in future, which will be an excellent indication to mechanical properties of this alloy since it provides more understanding to the behaviour of the material and better comprehend crack propagation and strain stress concentration. Practical implications: AA8090 alloy is an important candidate for aerospace and aircraft industries. Influence of annealing heat treatment and rolling direction on mechanical properties of AA8090 alloy provides more accurate information to the manufacturers who deal with this alloy. Originality/value: This study is affording a significant information regarding the effect of annealing and anisotropic behaviour on mechanical properties of AA8090. To our knowledge, there are few reports that study this combination of factors on AA8090 alloy.
Źródło:
Archives of Materials Science and Engineering; 2019, 99, 1/2; 5-12
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Annealing Treatment on (Mg17Al12) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy
Autorzy:
Abass, Marwa H.
Abdulkareem, Makarim H.
Hussein, Hussien A.
Powiązania:
https://bibliotekanauki.pl/articles/2201907.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
AZ91
alloy
heat treatment
corrosion
microstructure
antibacterial
hardness
Opis:
Heat treatment is the most suitable technique for altering the microstructure and, consequently, it is possible to create the optimal balance of corrosion resistance and mechanical strength in a material by carefully regulating the conditions during the heating process. The present work aims to investigate the effect of heat treatments (annealing) at (300°C) at different times (10, 20, and 30 hr) on the magnesium alloy. How the Mg17Al12 phase influences the corrosion behavior of AZ91D magnesium alloy was quantified in different solution (SBF, Lactic and Ringer). It was able to construct an extensive range of Mg17Al12 phase volume fractions by varying the annealing period. The corrosion potential of many specimens with varied proportions of the Mg17Al12 phase was evaluated. The results of the conducted tests manifested that the material's resistance to corrosion greatly improved with an increase in the volume fraction of Mg17Al12 phase. The effect of heat treatment on the microstructure was analyzed using transmission electron microscopy and X-ray diffraction. The SEM photographs evinced that the amount of β-Mg17Al12 phase decreased significantly, with the distribution occurring at the grain boundaries and with increasing the time of annealing, resulting in a highly saturated α-grain. The XRD validated the all material peaks of phases that are present. The corrosion test behavior of AZ91 alloy in the simulated body fluid (SBF), lactic, and Ringer solutions was investigated through electrochemical measurements, the result was elucidated as measured along the Tafel slope, and the corrosion current density of all heat treated samples was lower than that of the as-cast sample. The measurement of hardness (HV) demonstrated that the hardness decreased to (64.5 HV0.5) during the heat treatment. The result antibacterial efficiency was revealed that AZ91 at 30 hr was best then as cast against the bacteria E.coli.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 330--341
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Structural Studies of Sol-Gel Deposited Nanostructured CdO Thin Films: Annealing Effect
Autorzy:
Abdolahzadeh Ziabari, A.
Ghodsi, F.
Powiązania:
https://bibliotekanauki.pl/articles/1493680.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
78.66.Li
78.67.-n
81.20.Fw
Opis:
Nanocrystalline CdO thin films were prepared by sol-gel dip-coating method using a different solution. The as-deposited films were subjected to drying temperature of 120° in air. The prepared films were annealed in different temperatures of 200, 300 and 400°C. The characterization of samples was carried out by X-ray diffraction, scanning electron microscopy and UV-VIS spectroscopy. Results show that the samples are polycrystalline in nature and the crystallinity of the films improves with temperature. The average grain size is in the range of 19-34 nm. It was observed that the optical parameters of the films were affected by annealing temperature.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 536-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Annealing on the AC Conductivity and the Dielectric Properties of In$\text{}_{2}$Te$\text{}_{3}$ Thin Films
Autorzy:
Afifi, M. A.
Abd El-Wahabb, E.
Bekheet, A. E.
Atyia, H. E.
Powiązania:
https://bibliotekanauki.pl/articles/2014347.pdf
Data publikacji:
2000-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.55.+f
72.20.-i
Opis:
In$\text{}_{2}$Te$\text{}_{3}$ thin films were prepared by thermal evaporation technique. The composition of the films is checked by energy dispersive X-ray analysis. X-ray analysis showed that the as-deposited In$\text{}_{2}$Te$\text{}_{3}$ films as well as films annealed at temperatures ≤473K have crystalline structure. The ac conductivity σ$\text{}_{ac}$(ω), the dielectric constant ε$\text{}_{1}$ and the dielectric loss ε$\text{}_{2}$ of In$\text{}_{2}$Te$\text{}_{3}$ films were studied in the temperature range 303-373K and in the frequency range 100Hz-100kHz. The ac conduction activation energy ΔE$\text{}_{σ}$(ω) was found to be 0.065eV for the as-deposited films. The ac conductivity was found to obey the relation σ$\text{}_{ac}$(ω)=Aω$\text{}^{s}$, where s is the frequency exponent. The obtained temperature dependence of s is reasonably interpreted by quantum mechanical tunneling model. Both the dielectric constant ε$\text{}_{1}$ and the dielectric loss ε$\text{}_{2}$ increased with temperature and decreased with frequency in the investigated range. The frequency and temperature dependencies of σ$\text{}_{ac}$(ω), ε$\text{}_{1}$, and ε$\text{}_{2}$ for the annealed samples have the same behavior as that for the as-deposited samples. However, values of σ$\text{}_{ac}$(ω), ε$\text{}_{1}$, and ε$\text{}_{2}$ measured at any frequency and temperature increased with annealing temperature up to 473K. It was found also that ΔE$\text{}_{σ}$(ω) decreased with annealing temperature.
Źródło:
Acta Physica Polonica A; 2000, 98, 4; 401-409
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing Temperature on $Y_2O_3:SiO_2$ Nanocomposite Prepared by Sol-Gel Process
Autorzy:
Ahlawat, R.
Aghamkar, P.
Powiązania:
https://bibliotekanauki.pl/articles/1205213.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Bc
61.46.Df
78.67.Bf
Opis:
Oxide nanoparticles embedded in a polymer matrix produce nanocomposites which are useful for optics and electronic applications. Yttrium oxide nanoparticles have received much attention due to their various properties and are significantly used in fundamental and application oriented fields. The present paper reports the influence of annealing temperature on the $Y_2O_3:SiO_2$ nanocomposite prepared by sol-gel process. $Y(NO_3)_3 ·4H_2O$ and tetraethoxysilane were used as precursors and obtained powdered form of $Y_2O_3:SiO_2$ composite. The powder sample was annealed at 500C and 900C for 6 h which were characterized by X-ray diffraction, Fourier transform infrared and transmission electron microscope. X-ray diffraction data described that the broadening of peaks decreases with increase in annealing temperature which may be due to the increase in particle size. Sample analyzed by Fourier transform infrared and transmission electron microscopy confirmed the grain size dependence on annealing temperature. Cubic phase of yttrium oxide crystal structure was obtained within the silica matrix. The nanocrystallites size has been calculated using Debye-Scherrer formula, Williamson-Hall plot and transmission electron micrographs and compared at two different temperatures (a) 500C and (b) 900C.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 736-739
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An enhanced krill herd optimization technique used for classification problem
Autorzy:
Al-Mashhadani, Firas N.
Alsaffar, Qusay S.
Al-Jadir, Ibrahim A.
Powiązania:
https://bibliotekanauki.pl/articles/35535690.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
optimization
simulated annealing
standard krill herd
Opis:
In this paper, this method is intended to improve the optimization of the classification problem in machine learning. The EKH as a global search optimization method, it allocates the best representation of the solution (krill individual) whereas it uses the simulated annealing (SA) to modify the generated krill individuals (each individual represents a set of bits). The test results showed that the KH outperformed other methods using the external and internal evaluation measures.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 2; 354-364
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Pulsed Laser Power Annealing on Structural and Optical Characteristics of ZnSe Thin Films
Autorzy:
Aly, S.
Akl, Alaa
Howari, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401905.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.-z
68.55.jd
68.55.ag
78.70.Ck
81.15.Dj
78.20.-e
Opis:
Samples of ZnSe of the same film thickness (320 nm) have been thermally evaporated on unheated quartz substrates using high purity powder. The prepared films were subjected to pulsed laser annealing of two different powers. X-ray diffraction studies revealed that the as-deposited samples were polycrystalline cubic (zinc-blende type) structure. As the annealing power increases, the crystallinity of ZnSe films was improved with preferential orientation along the (111) direction parallel to the substrate surface. Microstructural characterizations have been evaluated using the Debye-Scherrer formula. The absorption coefficient as well as the energy gap for the as-deposited and the annealed samples were also reported.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 414-418
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Annealing Temperature on the Electric and Dielectric Properties of $Se_{70}Te_{15}Bi_{15}$ Films
Autorzy:
Atyia, H.
Powiązania:
https://bibliotekanauki.pl/articles/1207359.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ng
77.22.-d
Opis:
The effect of annealing at different temperatures between $T_{g}$ and $T_{c}$ on the AC conductivity and dielectric properties was studied for $Se_{70}Te_{15}Bi_{15}$ films grown by thermal evaporation technique. The films were characterized by X-ray diffraction, differential thermal analysis, and energy dispersive X-ray spectroscopy. X-ray diffraction analysis shows the occurrence of amorphous to polycrystalline transformation for films annealed at annealing temperature $T_{a}$≥ 473 K. AC conductivity $σ_{AC}(ω)$ was studied as a function of $T_{a}$, frequencies (0.1-100 kHz) and working temperatures (303-393 K). It was found that $σ_{AC}(ω)$ obeyed $Aω^{s}$ law. According to the values of s and its temperature dependence, the AC conduction mechanism was determined in terms of the correlated barrier hopping and quantum mechanical tunneling models for the as deposited and annealed films, respectively. The DC and AC activation energies were determined as a function of $T_{a}$. Values of dielectric constant $ε_1$ and dielectric loss $ε_2$ were found to increase with increasing $T_{a}$. A Debye-like relaxation of dielectric behavior was observed for polycrystalline films, and was found to be a thermally activated process.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 98-104
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of annealing conditions on changes of the structure and selected properties of Al88Y7Fe5 and Al88Y6Fe6 alloys
Autorzy:
Babilas, Rafał
Spilka, Monika
Łoński, Wojciech
Radoń, Adrian
Kądziołka-Gaweł, Mariola
Gębara, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2204524.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Y-Fe metallic glasses
heat treatment
structural tests
corrosion resistance
magnetic properties
szkło metaliczne Al-Y-Fe
obróbka cieplna
test strukturalny
odporność na korozję
właściwości magnetyczne
Opis:
Al-Y-Fe amorphous and nanocrystalline alloys are characterized by a unique collection of diverse properties that are influenced by various factors, including heat treatment. In this paper, the effect of heat treatment on the structural changes and selected properties of Al-Y-Fe metallic glasses in the as-spun state is investigated. The structure of the Al88Y7Fe5 and Al88Y6Fe6 alloys was examined by X-ray diffraction (XRD) and Mössbauer spectroscopy (MS). The corrosion resistance of the samples was characterized using polarization tests in a 3.5% NaCl solution at 25 °C. The effect of sodium chloride on the surface was studied with scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The magnetic properties of Al-based alloys were explored using a vibrating sample magnetometer (VSM). It was revealed that the tested alloys show better properties after annealing than in the as-spun state. The annealing of the Al88Y7Fe5 and Al88Y6Fe6 alloys in the temperature range of 200 to 300 °C improved the magnetic properties and corrosion resistance of these materials. After 3,600 s, the better EOCP values were recorded for the Al88Y6Fe6 and Al88Y7Fe5 alloys after annealing at 300 °C and 200 °C, adequately. On the basis of the polarization tests, it was concluded that the electrochemical properties are better for Al88Y6Fe6 alloys after annealing at 300 °C.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144614
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Nitridation and Pre-Growth Annealing of the Sapphire Substrate on the Quality of Zinc Oxide Thin Films Grown by RF-Magnetron Sputtering
Autorzy:
Baseer Haider, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032562.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
thin films
wide bandgap semiconductors
ZnO
magnetron sputtering
Opis:
ZnO has attracted much attention due to its wide bandgap (3.2 eV) and high exciton binding energy of 60 meV. These properties make ZnO a highly desirable material for high frequency devices that can work in harsh environment. We have grown ZnO thin films at different temperatures ranging from 100°C to 500°C. We have observed that surface roughness is first decreased with the increase in the growth temperature but then by further increasing the growth temperature beyond 300°C, results in increased surface roughness of the grown samples, whereas grain size of the samples increases with the increase in the growth temperature. Crystalline quality of the films is also improved with the increase in the growth temperature but then degrades by further increase beyond 200°C. We achieved the highest Hall mobility for the ZnO sample grown at 200°C. The optimum growth condition of ZnO thin films on sapphire (0001) in our RF/DC magnetron-sputtering unit were achieved for the films grown at 200°C. Subsequently, we performed pre-growth treatment to the sapphire substrate then grew ZnO films at 200°C. Pre-growth treatment involved heating the substrate at 500°C for about half an hour and then etching the sapphire surface with nitrogen plasma. We have observed that pre-growth heating and nitridation of the sapphire substrate results in bigger grain size whereas no improvement was observed in the crystallinity of the film.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1325-1328
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse Logistics Network Problem using simulated annealing with and without priority-algorithm
Autorzy:
Benaissa, M.
Slama, I.
Dhiaf, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/223903.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reverse logistics
Logistics Network Problem
mrLNP
priority-based encodin
simulated annealing
logistyka odwrotna
sieci logistyczne
Opis:
In recent years, Reverse Logistics (RL) has become a field of importance for all organizations due to growing environmental concerns, legislation, corporate social responsibility and sustainable competitiveness. In Reverse logistics, the used or returned products are collected after their acquisition and inspected for sorting into the different categories. The next step is to disposition them for repair, remanufacturing, recycling, reuse or final disposal. Manufacturers may adopt reverse logistics by choice or by force, but they have to decide whether performing the activities themselves or outsourcing to a third party (Martin et al., 2010). Lourenço et al., (2003) described three main areas of improvement within the RL process. Firstly, companies can reduce the level of returns through the analysis of their causes. Secondly, they can work on the improvement of the return’s process and, thirdly, they can create value from the returns. This paper considers the multistage reverse Logistics Network Problem (mrLNP) proposed by Lee et al., (2008). With minimizing the total of costs to reverse logistics shipping cost. We will demonstrate the mrLNP model will be formulated as a three-stage logistics network model. Since such network design problems belong to the class of NP-hard problems we propose a Simulated Annealing (SA) and simulated annealing with priority (priSA) with special neighborhood search mechanisms to find the near optimal solution consisting of two stages. Computer simulations show the several numerical examples by using, SA, priSA and priGA(Genetic algorithm with priority-based encoding method) and effectiveness of the proposed method.
Źródło:
Archives of Transport; 2018, 47, 3; 7-17
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Stochastic vs. Greedy Heuristics in Traveling Salesman Problem
Autorzy:
Białogłowski, M.
Staniaszek, M.
Laskowski, W.
Grudniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/91276.pdf
Data publikacji:
2018
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
traveling salesman problem
Nearest Neighbor
Monte Carlo
Simulated Annealing
Genetic Algorithm
particle swarm optimization (PSO)
Opis:
We studied the relative performance of stochastic heuristics in order to establish the relations between the fundamental elements of their mechanisms. The insights on their dynamics, abstracted from the implementation details, may contribute to the development of an efficient framework for design of new probabilistic methods. For that, we applied four general optimization heuristics with varying number of hyperparameters to traveling salesman problem. A problem-specific greedy approach (Nearest Neighbor) served as a reference for the results of: Monte Carlo, Simulated Annealing, Genetic Algorithm, and Particle Swarm Optimization. The more robust heuristics – with higher configuration potential, i.e. with more hyperparameters – outperformed the smart ones, being surpassed only by the method specifically designed for the task.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2018, 12, 19; 7-24
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of precipitates in aluminium alloy 6013 after cold-rolling and annealing
Autorzy:
Bieda, M.
Jarzębska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1058123.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
68.37.Lp
Opis:
The aim of the present work was to observe changes in precipitations during annealing after cold-rolling. Series of the samples from cold-rolled AA6013 were prepared and compared to undeformed samples. The samples were annealed at the temperatures equal to 260, 490°C for undeformed state and at 280, 360, and 530°C for cold-rolled state. For investigation thin foils were prepared. Chemical composition and crystal structure of precipitates was analysed and described using transmission electron microscopy imaging, X-ray energy-dispersive spectroscopy and selected-area diffraction techniques. The researches indicated that low annealing temperatures caused dissolution of metastable β and Q phases. With increasing temperature there also occurred growth of Q phase. At highest annealing temperatures there were noticed precipitations of β phase again. Microstructural observation also revealed an impact of those particles on recrystallization processes.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 988-990
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orientation mapping and in situ annealing applied for characterization of changes in aluminium alloys after deformation
Autorzy:
Bieda, M.
Powiązania:
https://bibliotekanauki.pl/articles/1075659.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
81.40.Lm
81.70.-q
Opis:
The paper presents application of combined in situ annealing and orientation mapping technique for investigation the microstructural changes in the aluminium alloy 6013 with bimodal distribution of the second phase particles during recovery and recrystallization processes. Information about grain distribution, misorientation between grains, size and shape of the grains at each stage of recrystallization process were obtained. Complexity of the experimental procedure is defined and discussed in order to avoid artificial results. Although the article described the advantages and disadvantages of those method used in transmission electron microscopy and scanning electron microscopy in the work the results from scanning electron microscopy/electron backscattering diffraction in situ heating experiments are highlighted. Obtained data are in a good agreement with previous transmission electron microscopy and calorimetry studies.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 979-981
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ temperatury wyżarzania na strukturę i odporność korozyjną stali duplex X2CrNiMoN22-5-3
The effect of annealing temperature on the structure and corrosion resistance of X2CrNiMoN22-5-3 duplex steel
Autorzy:
Bielanik, J.
Rakowski, C.
Ziółkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/258420.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
stal duplex
wyżarzanie
struktura
twardość
odporność korozyjna
duplex steel
annealing
structure
hardness
corrosion resistance
Opis:
Dwufazowe stale duplex przesycone z właściwej temperatury charakteryzują się strukturą zawierającą ok. 50% ferrytu i ok. 50% austenitu, wysokimi właściwościami mechanicznymi oraz bardzo dobrą odpornością na korozję ogólną, międzykrystaliczną i wżerową. Wygrzewanie przesyconej stali duplex lub powolne jej chłodzenie w zakresie temperatur 600-900°C zmniejsza udział ferrytu w strukturze, który ulega rozpadowi na międzymetaliczną fazę σ i austenit. Pojawienie się fazy σ w ferrycie wywołuje kruchość stali oraz zmniejsza jej odporność na korozję wżerową obniżając krytyczną temperaturę korozji wżerowej CPT z 60 do 30°C. Wygrzewanie lub powolne chłodzenie przesyconej stali duplex w zakresie temperatur 300-500°C wywołuje tzw. kruchość 475, której nie towarzyszy obniżenie odporności stali na korozję wżerową.
The two-phase ferritic-austenitic duplex steels in an as-quenched condition at the proper temperature is characterised by a two-phase structure including approx. 50% ferrite and approx. 50% austenite, high mechanical proprieties and very good resistance against general and pitting corrosion. A deficiency in duplex steels is their tendency to become brittle in the course of annealing or service in the 300-500°C and 600-900°C temperature ranges. The heating or slow cooling of duplex steels in the range of temperatures 600-900°C reduce, and in extreme cases, even eliminates all contents of the ferrite in the structure, which decomposes in the intermetallic σ phase and austenite. In the σ phase in the ferrite there is a decrease of impact strength KU2 < 10 J of steel and reduction in its resistance to pitting corrosion as the result of epitaxy. After 5 hours of annealing of the X2CrNiMoN22-5-3 duplex steel at a temperature of 750°C, the total contents of the ferrite transformed and had a lower critical pitting temperature (CPT) from 60 to 30°C. The ageing of the X2CrNiMoN22-5-3 steel at the temperature of 450°C for 5 hours is called brittle 475 (KU2 ~ 30 J), which does not accompany the lowering of the resistance to pitting corrosion.
Źródło:
Problemy Eksploatacji; 2010, 2; 85-92
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 281

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