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    Wyświetlanie 1-11 z 11
    Tytuł:
    Microstructural and chemical analysis of selected poultry bedding materials — potential substrates in agricultural biogas production technologies
    Autorzy:
    Sakiewicz, P.
    Cebula, J.
    Piotrowski, K.
    Bohdziewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190126.pdf
    Data publikacji:
    2019
    Wydawca:
    Gdańska Szkoła Wyższa
    Tematy:
    agricultural biogas
    poultry breeding
    bedding biomaterials
    chemical analysis
    microstructural analysis
    Opis:
    The research results concerning microstructure and chemical composition of selected post-processed poultry beddings derived from industrial-scale poultry breeding are presented. It was found, that the proper trend is providing the optimal conditions in respect to bred-animals comfort. The highest concentration of biogenic elements — especially nitrogen and potassium — was observed for the samples of poultry manure premixed with the straw. High quality of bedding biomass influences the inhibition of poultry-manure decomposition processes advantageously. In effect, biogas yield increases (due to C/N adjustment), in spite of the fact that increase in ammonium nitrogen concentration simultaneously inhibits the methane fermentation process.
    Źródło:
    Eco-Energetics: technologies, environment, law and economy; 2019, 2; 113--122
    2657-5922
    2657-7674
    Pojawia się w:
    Eco-Energetics: technologies, environment, law and economy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Analysis of Ambient Cured Phosphate Based-Geopolymers with Coal-Ash as Precursor
    Autorzy:
    Burduhos Nergis, Dumitru Doru
    Vizureanu, Petrica
    Lupescu, Stefan
    Burduhos Nergis, Diana Petronela
    Perju, Manuela-Cristina
    Sandu, Andrei Victor
    Powiązania:
    https://bibliotekanauki.pl/articles/2106564.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acid activation
    coal ash
    microstructural analysis
    phosphate based geopolymers
    Opis:
    An alternative for Ordinary Portland cement (OPC) consumption is the production and integration of green cement. In other words, the clinker consumption has to be replaced with new low-carbon binders. A possible solution was introduced by the geopolymerisation technology. However, the alkaline activation of geopolymers offers the possibility of obtaining greener materials with high properties, superior to OPC, but due to the high price of sodium silicate, their industrial use is limited. In the past few years, a new activator has been discovered, namely phosphoric acid. This study approaches the obtaining of coal ash-based geopolymers activated with acid solution cured at room temperature. Accordingly, phosphoric acid, 85% by mass, was diluted in distilled water to obtain a corresponding activation solution for H3PO4/Al2O3 ratio of 1.0 and two types of geopolymers were ambient cured (22°C ±2°C). Moreover, to evaluate the geopolymerisation potential of this system (coal ash - phosphoric acid), SEM and EDS analysis was performed to investigate their morphologic characteristics.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 595--600
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Sintering Temperature on the Microstructure of Coal-Ash Based Geopolymers
    Autorzy:
    Burduhos-Nergis, Dumitru Doru
    Vizureanu, Petrica
    Achitei, Dragos C.
    Sandu, Andrei Victor
    Burduhos-Nergis, Diana Petronela
    Abdullah, Mohd Mustafa Al Bakri
    Powiązania:
    https://bibliotekanauki.pl/articles/28032460.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    geopolymers
    alkali activation
    microstructural analysis
    sintered structures
    high temperature exposure
    Opis:
    Currently, one of the main challenges of civil engineering and science materials engineers is to develop a sustainable substitute for Ordinary Portland Cement. While the most promising solution is provided by the geopolymerisation technology, most of the studied geopolymers are based on natural raw materials (kaolin). The metakaolin is mainly preferred because of its rapid rate of dissolution in the activator solution, easy control of the Si/Al ratio, and white color. However, its high cost prevents it from being widely used in geopolymer composites or other materials that can become an industrial alternative for Ordinary Portland Cement. Several studies have shown that geopolymers with good performance can also be obtained from secondary raw materials (industrial wastes such as coal ash or slag). This explains why countries with rapidly developing economies are so interested in this technology. These countries have significant amounts of industrial waste and lack a well-developed recycling infrastructure. Therefore, the use of these by-products for geopolymers manufacturing could solve a waste problem while simultaneously lowering virgin raw material consumption. This study evaluates the effect of replacing different amounts of coal ash with sand on the microstructure of sintered geopolymers. Accordingly, scanning electron microscopy and energy dispersive X-ray analysis were involved to highlight the morphological particularities of room-cured and sintered geopolymers.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 631--637
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical analysis using multiple regression of stereological parameters for skeleton castings microstructure
    Autorzy:
    Cholewa, M.
    Dziuba-Kałuża, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382076.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AlSi alloy
    microstructural analysis
    statistical analysis
    skeleton casting
    stop Al-Si
    analiza mikrostrukturalna
    analiza statystyczna
    odlew szkieletowy
    Opis:
    In this article authors showed influence of technological parameters and modification treatment on structural properties for closed skeleton castings. Approach obtained maximal refinement of structure and minimal structure diversification. Skeleton castings were manufactured in accordance with elaborated production technology. Experimental castings were manufactured in variables technological conditions: range of pouring temperature 953÷1013 K , temperature of mould 293÷373 K and height of gating system above casting level 105÷175 mm. Analysis of metallographic specimens and quantitative analysis of silicon crystals and secondary dendrite-arm spacing analysis of solution α were performed. Average values of stereological parameters for all castings were determined. (B/L) and (P/A) factors were determined. On basis results of microstructural analysis authors compares research of samples. The aim of analysis was selected samples on least diversification of refinement degree of structure and least silicon crystals. On basis microstructural analysis authors state that samples 5 (AlSi11, Tpour 1013K, Tmould 333K, h – 265 mm) has the best structural properties (least diversification of refinement degree of structure and the least refinement of silicon crystals). Then statistical analysis results of structural analysis was obtained. On basis statistical analysis autors state that the best structural properties for technological parameters: Tpour = 1013 K, Tmould = 373 K and h = 230 mm [4]. The results of statistical analysis are the prerequisite for optimization studies.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the OCHN3MFA steel in terms of cutting forces and cutting material flank wear mechanisms in hard turning processes
    Autorzy:
    Majerík, Jozef
    Barényi, Igor
    Pokorný, Zdenek
    Sedlák, Josef
    Neumann, Vlastimil
    David, Dobrocký
    Jaroš, Aleš
    Krbata, Michal
    Jambor, Jaroslav
    Kusenda, Roman
    Sagan, Miroslav
    Procházka, Jiri
    Powiązania:
    https://bibliotekanauki.pl/articles/2086873.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical properties
    microstructural analysis
    cutting forces
    flank wear
    crater wear
    właściwości mechaniczne
    analiza mikrostrukturalna
    siły tnące
    Opis:
    This article deals with the effect of selected machining parameter values in hard turning of tested OCHN3MFA steel in terms of SEM microstructural analysis of workpiece material, cutting forces, long-term tests, and SEM observations of flank wear VB and crater wear KT of used changeable coated cemented carbide cutting inserts in the processes of performed experiments. OCHN3MFA steel was selected as an experimental (workpiece) material. The selected experimental steel was analyzed prior to hard turning tests to check the initial microstructure of bulk material and subsurface microstructure after hard turning and chemical composition. Study of workpiece material’s microstructure and worn cemented carbide cutting inserts was performed with Tescan Vega TS 5135 scanning electron microscope (SEM) with the X-Ray microanalyzer Noran Six/300. The chemical composition of workpiece material was analyzed with Tasman Q4 surface analyzer. All hard turning experiments of the used specimens were performed under the selected machining parameters in the SU 50A machine tool with the 8th selected individual geometry of coated cementite carbide cutting inserts clamped in the appropriate DCLNR 2525M12-M type of cutting tool holder. During the hard turning technological process of the individual tested samples made of OCHN3MFA steel, cutting forces were measured with a Kistler 9257B piezoelectric dynamometer, with their subsequent evaluation using Dynoware software. After the long-term testing, other experiments and results were also realized, evaluating the influence of selected machining parameters with different cutting insert geometry on the achieved surface quality.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139203, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractographic Analysis Of Selected Boron Steels Subjected To Impact Testing
    Analiza fraktograficzna wybranych stali z borem w badaniach udarnościowych
    Autorzy:
    Dudziński, W.
    Konat, Ł.
    Białobrzeska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/355898.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-alloy steels with boron
    microstructural analysis
    impact strength
    fractography
    niskostopowa stal z borem
    analiza mikrostruktury
    udarność
    faktografia
    Opis:
    In this paper dynamic properties of low-alloy boron steels – Hardox 500, B27 and HTK 900H in delivered state (after hardening and tempering) are considered. Charpy V-notch (CVN) test results in connection with fractography in the ductile-to-brittle transition temperature region were analyzed. Obtained from CVN test the impact transition curve, not always predicts properly a behavior of materials in conditions of dynamic loading. So an analyze of character of fracture helps to evaluate the real behavior of materials. Tested samples were cut out longitudinally in relation to cold work direction. The results of CVN test for selected steels, in temperatures: −40°C, −20°C, 0°C and +20°C are presented. Regarding ductile-to-brittle transition temperature, there is a significant difference taking into account values of Charpy V energy absorbed and a character of fracture.
    W artykule przeprowadzono rozważania na temat dynamicznych właściwości niskostopowych stali z borem – Hardox 500, B27 oraz HTK 900H w stanie dostarczenia (po hartowaniu i odpuszczaniu). Przeprowadzono próbę udarności Charpy’ego w zakresie temperaturowego przejścia plastyczno-kruchego w powiązaniu z analizą fraktograficzną. Wyznaczona na podstawie wyników próby Charpy’ego udarnościowa krzywa przejścia, nie zawsze prawidłowo charakteryzuje zachowanie się materiału w warunkach obciążeń dynamicznych. Dlatego też fraktografia może uściślić rzeczywiste zachowanie się materiału. Próby przeprowadzono na próbkach wzdłużnych do kierunku przeróbki plastycznej w temperaturach: −40°C, −20°C, 0°C i +20°C. Stwierdzono występowanie znaczącej różnicy w określeniu temperatury przejścia w przypadku, gdy jest ona wyznaczona w oparciu o wynik próby udarności, a także gdy wyznaczono ją opierając się na charakterze przełomu.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3; 2373-2378
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural evaluation of the lacquered layer quality after corrosion load
    Autorzy:
    Svobodova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/111613.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    chemical pre-treatments
    steel substrate
    nanotechnology
    iron phosphating
    microstructural analysis
    wstępna obróbka chemiczna
    podłoże stalowe
    nanotechnologia
    fosforanowanie żelaza
    analiza mikrostruktury
    Opis:
    Surface pre-treatment is one of the most important steps before applying the final surface treatment. These pre-treatments, like phosphating, alkaline degreasing, pickling in acids, is used to remove impurities from the surface of the base material and to create appropriate conditions for adhesion of the final coating (metal coatings, organic coatings). Currently are on the rise surface treatments technologies, which are based on nanotechnology. It's a new generation of chemical products for the chemical surface preparation. This paper deals with the evaluation of microstructure of painted sheet metal after corrosion load with salt spray in the corrosion chamber. Metal sheets used for the experiment have been produced from low-carbon non alloy steel. For pre-treatment of the sheet metal was used alkaline degreasing (CC), iron phosphating (Feph) and nanotechnology based product Alfipas (Zr) in combinations: group A - CC + Zr, group B - Feph + Zr and group C - CC + Feph + Zr. The aim of this paper is to analyze the behavior of painted sheet metal after corrosion load and evaluate the effect of pretreatment to resistance of painted surface layer.
    Źródło:
    Production Engineering Archives; 2015, 6, 1; 45-48
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Austenite Grain Growth in Low-Alloy Boron Steel with High Resistance to Abrasive Wear
    Analiza rozrostu ziarna austenitu w wybranej niskostopowej stali z borem o podwyższonej odporności na zużycie ścierne
    Autorzy:
    Białobrzeska, B.
    Dudziński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/353511.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-alloy steels with boron
    heat treatment
    austenite grains
    microstructural analysis
    niskostopowa stal z borem
    obróbka cieplna
    ziarna austenitu
    analiza mikrostrukturalna
    Opis:
    Today low-alloy steels with boron achieve high resistance to abrasive wear and high strength. These features are obtained by using advanced technology of manufacturing. This makes boron steels increasingly popular and their application more diverse. Application of these steels can extend the lifetime of very expensive machine construction in many industries such as mining, the automotive, and agriculture industries. An interesting subgroup of these materials is steel with boron intended for heat treatment. These steels are supplied by the manufacturer after cold or hot rolling so that it is possible for them to be heat treated in a suitable manner by the purchaser for its specific application. Very important factor that determines the mechanical properties of final product is austenite grain growth occurring during hot working process such us quenching or hot rolling. Investigation of the effect of heating temperature and holding time on the austenite grain size is necessary to understand the growth behavior under different conditions. This article presents the result of investigation of austenite grain growth in selected low-allow boron steel with high resistance to abrasive wear and attempts to describe the influence of chemical composition on this process.
    Obecnie stale z dodatkiem boru osiągają dużą odporność na zużycie ścierne w połączeniu z wysokimi parametrami wytrzymałościowymi. Te właściwości uzyskiwane są drogą zaawansowanej technologii wytwarzania. To sprawia, że stale z borem zyskują coraz większą popularność, a ich zastosowanie jest coraz szersze. Zastosowanie tego typu stali może wydłużyć trwałość często drogich maszyn przemysłu górniczego, motoryzacyjnego, czy rolniczego. Interesującą podgrupę tych materiałów stanowią stale z dodatkiem boru przeznaczone do obróbki cieplnej. Producenci dostarczają je w stanie po walcowaniu na gorąco do ewentualnie przeprowadzenia obróbki cieplnej przez kupującego odpowiedniej do konkretnego zastosowania. Ważnym czynnikiem, który istotnie wpływa na właściwości mechaniczne gotowego wyrobu, jest wielkość ziarna austenitu podczas przeprowadzania procesów obróbki cieplnej lub cieplno-plastycznej takich jak hartowanie, czy walcowanie na gorąco. A zatem określenie wpływu temperatury i czasu austenityzowania na wielkość ziarna austenitu jest bardzo istotne. W artykule przedstawiono wyniki badań rozrostu ziarna austenitu przy różnych temperaturach i czasach austenityzowania w wybranej niskostopowej stali z borem o podwyższonej odporności na ścieranie oraz podjęto próbę opisania wpływu składu chemicznego na ten proces.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1649-1655
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Investigations of Structure and Properties of TIG Welded Ti-6Al-4V Alloy
    Autorzy:
    Dewangan, Saurabh
    Ranjan, Raushan
    Chattopadhyaya, Somnath
    Gope, Deepak
    Bogdan-Chudy, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/2024184.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Ti-6Al-4V titanium alloy
    TIG welding
    microstructural analysis
    tensile test
    hardness test
    stop tytanu Ti-6Al-4V
    spawanie TIG
    analiza mikrostrukturalna
    próba rozciągania
    próba twardości
    Opis:
    The titanium (Ti) and its alloys are taken into interest for commercial purpose due to its low density, high yield strength and high corrosion resistance properties. The present work deals with microstructural observation and mechanical property analysis of tungsten inert gas (TIG) welded Ti-6Al-4V alloy joints. For the purpose, two different set of plates were welded at same current and voltage, i.e., 190 A and 24 V, by the TIG welding technique. A critical analysis of the microstructure and mechanical properties like tensile strength and hardness of the welded Ti-6Al-4V plates was carried out in this work. It was found that both plates showed different behavior during the tension test. Plate 1 had 464.54 MPa of tensile stress and it broke at the welded joint. Plate 2 was unaffected at the welded zone but was broken at the base metal zone. The second plate had tensile strength of 501.83 MPa. According to the hardness test, both the welded plates possessed the highest hardness at the welded zone. However, plate 2 showed approximately 10% higher hardness than that of plate 2. A proper inter-relationship was observed between the mechanical behavior and microstructural appearance. The microscopic view of the welded joints revealed the presence of α, β and martensitic-α phases.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 1; 156-165
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural features evaluation of age-hardened A 226 cast alloy by image analysis
    Autorzy:
    Kucharikova, L.
    Tillova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/111749.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    age-hardening
    aluminum cast alloys
    image analysis
    quantitative analysis
    microstructural features
    utwardzanie przez starzenie
    stopy aluminium
    analiza obrazu
    analiza ilościowa
    Opis:
    Age-hardening provides one of the most widely used mechanisms for the strengthening of aluminum alloys. The age-hardening involves three steps: solution treatment, quenching and aging. The temperature of solution treatment and aging is very important in order to reach desired properties of castings. The optimum temperature of solution treatment and aging led to formation microstructural features in form which does not lead to decreasing properties, but increasing ones. The major micro-structural features in A 226 cast alloys which are responsible for increasing properties are: eutectic Si particles, Cu-rich phases, Fe-rich phases and porosity. The increase of properties depends on morphology, size and volume of microstructural features. In order to assess age-hardening influence on microstructural features in A226 cast alloys were used as possibilities of evaluation by means of image analysis. Quantitative analysis decelerate changes in microstructure includes the spheroidization and coarsening of eutectic silicon, gradual disintegration, shortening and thinning of Fe-rich intermetallic phases, the dissolution of precipitates and the precipitation of finer hardening phase (Al2Cu) further increase in the hardness and tensile strength in the alloy. Changes of mechanical properties were measured in line with STN EN ISO.
    Źródło:
    Production Engineering Archives; 2017, 17; 3-8
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the optimal solution treatment temperature of aluminum cast alloys by using quantitative analysis
    Autorzy:
    Kucharikova, L.
    Tillova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/109049.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aluminum cast alloys
    quantitative analysis
    microstructural features
    eutectic Si
    Fe-rich phases
    Cu-rich phases
    stopy aluminium
    odlewnicze stopy aluminium
    cechy mikrostrukturalne
    analiza ilościowa
    Opis:
    Heat treatment of aluminum casts is necessary for achieving the desired properties of casts. Heat treatment caused changes in microstructure and substructure of materials and therefore it is necessary to control which changes are sufficient and which are insufficient. Morphology (shape, size and distribution) of microstructural features influence the properties of cast rapidly. Contribution describes influence of the heat treatment marking T4 - solution treatment in dependence on temperature (505, 515 a 525 °C) and holding time (2, 4, 8, 16 a 32 hour) on structure (α–phase, eutectic silicon, intermetallic phases) and mechanical properties (ultimate tensile strength - UTS and Brinell hardness - HBW) of A226 cast alloy. This cast alloy is made out of secondary aluminum. Secondary aluminum alloys are made of aluminum scrap. About 70 % of such material are used in the manufacture of casts. Therefore the strictly microstructure control of experimental material before and after heat treatment is necessary for declaration of cast properties. Nowadays manufacturers use the methods of quantitative analysis for quick control of microstructural features. This work present some of them.
    Źródło:
    Archiwum Wiedzy Inżynierskiej; 2017, 2, 2; 27-30
    2544-2449
    Pojawia się w:
    Archiwum Wiedzy Inżynierskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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