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    Tytuł:
    On the Load Dependence of Micro-Hardness Measurements: Analysis of Data by Different Models and Evaluation of Measurement Errors
    Autorzy:
    Petrik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353270.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro-hardness
    ISE
    standard reference block
    Opis:
    The influence of applied loads between 0.09807 N and 0.9807 N on measured values of micro-hardness was evaluated by Meyer’s index n, proportional specimen resistance model (PSR) and Hays – Kendall methods, Total Dispersion Zone and Analysis of Variance (ANOVA). The measurement was repeated 6 times using the same hardness reference block with standard hardness Hc = 327 HV0.05 as a sample. The influence of the load on the measured value of micro-hardness is statistically significant, and the relationship between applied load and micro-hardness manifests reverse indentation size effect (ISE) for most of “measurements”. The high value of the uncertainty of results can affect the existence and nature of ISE, especially at low loads.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1819-1824
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    “In-vitro” Tests on New Biodegradable Metallic Material Based on ZnMgY
    Autorzy:
    Panaghie, Catalin
    Cimpoesu, Nicanor
    Benchea, Marcelin
    Roman, Ana-Maria
    Manole, Vasile
    Alexandru, Adrian
    Cimpoesu, Ramona
    Cazacu, Marius Mihai
    Wnuk, Izabela
    Zegan, Georgeta
    Powiązania:
    https://bibliotekanauki.pl/articles/2106563.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biodegradable
    tafel
    potentiostat
    micro-hardness
    10xDPBS
    Opis:
    Biodegradable materials represent a new class of biocompatible materials with applications in many medical cases where the support must be provided only for a certain period. In this article obtaining of ZnMgY alloy is presented along with some basic characteristic investigations like chemical composition (energy dispersive spectroscopy - EDS), microstructure (optical microscopy - OM and scanning and electron microscopy - SEM), immersion behavior in 10xDPBS (Dulbecco Phosphate Buffer Saline) solution (mass loss and surface degradation), electro-corrosion behavior (potentiostat with a three electrodes cell) and micro-hardness of the experimental alloy compared to cast Zn and ZnMg materials. The results present an improvement of micro-hardness of Zn by alloying with Mg and Y and a modification of corrosion resistance.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 587--594
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Different Torsion Pitch on Microstructural Evolution and Strengthening Mechanism of Al Wires
    Autorzy:
    Sedighi, M.
    Vaezi, A.
    Pourbashiri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351811.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    torsion deformation
    tensile test
    micro hardness
    microstructure
    Al wire
    Opis:
    This paper focused on the effect of pure torsion deformation and various torsion pitches on the mechanical properties of the commercial pure Al wires which has not been examined so far. The initial wires with diameter of 4 mm have been torsion deformed to different pitch length (PL). In order to investigate the effect of gradient microstructure caused by torsion deformation, three different pitch length of 15 mm, 20 mm and 30 mm are considered. The results revealed that the level of grain refinement is correlated with the amount of induced plastic shear strain by torsion deformation. For the wire with pitch length of 15 mm, the grain sizes decreased to about 106 μm and 47 μm in the wire center and edge from the initial size of about 150 μm of the annealed wire. The micro-hardness measurement results show a gradient distribution of hardness from the wire center to the wire surface that confirmed the increasing trend of plastic shear strain obtained by FE simulations. The hardness of annealed sample (35 HV) is increased up to 73 HV at the wire surface for the smallest pitch length. The yield and ultimate tensile strength of the torsion deformed wires are also increased up to about 85 MPa and 152 MPa from the initial values of 38 MPa and 103 MPa of the annealed one respectively while the maximum elongation reduced significantly.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 625-632
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction and Wear Behavior of Direct Metal Deposition on SUH3
    Autorzy:
    Choi, Byungjoo
    Cho, In-Sik
    Jung, Do-Hyun
    Lee, Moon G.
    Jeon, Yongho
    Powiązania:
    https://bibliotekanauki.pl/articles/352111.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    direct metal deposition
    heat pretreatment
    friction test
    wear test
    micro-hardness
    Opis:
    Poppet valves made from high-frequency heat-treated SUH3 steel have insufficient durability, and scratches appear on the valve face in prolonged use. It is necessary to develop surface treatment technology with excellent durability to prevent the deterioration of engine performance. Therefore, a surface treatment technology with higher abrasion resistance than existing processes was developed by direct metal deposition to the face where the cylinder and valve are closed. In this study, heat pretreatment and deposition tests were performed on three materials to find suitable powders. In the performance evaluation, the hardness, friction coefficient, and wear rate were measured. Direct metal deposition using Inconel 738 and Stellite 6 powders without heat pretreatment were experimentally verified to have excellent durability.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 841-844
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Productivity and reliability improvement in turning Inconel 718 alloy : case study
    Poprawa produktywności i niezawodności toczenia stopu Inconel 718 : studium przypadku
    Autorzy:
    Zębala, W.
    Słodki, B.
    Struzikiewicz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366203.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    Inconel
    turning
    productivity
    optimization
    parameters
    micro-hardness
    toczenie
    produktywność
    optymalizacja
    parametry
    mikrotwardość
    Opis:
    The paper presents an investigation of Inconel 718 alloy finishing turning, using a procedure that allows the optimal cutting data to be found with a maximization of the metal removal rate as the optimization criterion. The optimization procedure does not allow the required values of the chosen surface roughness indicator, cutting force and cutting tool wedge temperature to be exceeded at the same time. The optimization procedure includes the preliminary cutting tests for establishing the range of cutting data (feed and depth of cut) for the correct chip breaking as well as research concerning micro-hardness measurements which enables the cold work zone to be determined and the minimal value of the feed to be defined. The functionality of the algorithm was verified by using the improvement in machining productivity and reliability of an aircraft engine element as an example.
    Artykuł opisuje badania obróbki wykończeniowej toczeniem stopu Inconel 718, mające na celu optymalizację parametrów skrawania z uwzględnieniem maksymalizacji objętościowej wydajności obróbki, jako kryterium optymalizacyjnego. Proponowana procedura uwzględnia wymagane w procesie ograniczenia dotyczące wartości parametru chropowatości obrabianej powierzchni, siły skrawania oraz maksymalnej temperatury w strefie skrawania. Procedura optymalizacyjna zawiera wstępne testy mające na celu ustalenie w lokalnych warunkach obróbki użytecznego zakresu parametrów skrawania (posuwu i głębokości skrawania) dla otrzymania korzystnej postaci wiórów. Wykonane pomiary mikrotwardości w strefie skrawania umożliwiły określenie wielkości strefy zgniotu warstwy wierzchniej, co z kolei pozwoliło na zdefiniowanie minimalnej wartości posuwu. Procedurę optymalizacyjną zweryfikowano na przykładzie obróbki wybranej powierzchni elementu silnika lotniczego. Osiągnięto znaczną poprawę produktywności i niezawodności procesu obróbki.
    Źródło:
    Eksploatacja i Niezawodność; 2013, 15, 4; 421-426
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Characteristics of Ti-Al-Dy Alloy Produced by High Energy Ball Milling
    Autorzy:
    Kim, Yuri
    Rhee, Hoseong
    Chang, Si Young
    Powiązania:
    https://bibliotekanauki.pl/articles/2049319.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high energy ball milling
    Ti-Al-Dy powders
    SPS
    microstructure
    micro-hardness
    Opis:
    In this study, the alloying of Ti, Al and Dy powders by high energy ball milling, and the spark plasma sintering (SPS) characteristics of as milled powders have been investigated based on the observation of microstructure. Pure Ti, 6wt% Al and 4wt% Dy powders were mixed and milled with zirconia balls at 600 ~ 1000 rpm for 3h in an Ar gas. The initial sizes of Ti, Al and Dy powders were approximately 20, 40, and 200 μm, respectively. With increasing the milling speed from 600 to 1000 rpm, the size of mixing powders reduced from 120 to 15 μm. On the other hand, from XRD results of powders milled at higher speeds than 700rpm, the peaks of Ti3Al and AlDy phases were identified, indicating the successful alloying. Therefore, the powders milled at 800 rpm have been employed for the SPS under the applied pressure of 50 MPa at 1373K for 15 min. In the SPSed sample, the Al3Dy and two ternary Ti-Al-Dy phases were newly detected, while the peak of AlDy phase disappeared. The SPSed Ti-6Al-4Dy alloy revealed high relative density and micro-hardness of approximately 99% and 950Hv, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 789-783
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Process Parameters of Ultrasonic Welding on Dissimilar Metal Joints
    Autorzy:
    Mohan Kumar, Anand
    Rajasekar, R.
    Karthik, Vaduganathan
    Kheawhom, Soorathep
    Powiązania:
    https://bibliotekanauki.pl/articles/2049410.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3105-H18 aluminium alloy
    pure copper
    ultrasonic welding
    optimization
    micro-hardness
    Opis:
    Nowadays the automotive industry mostly prefers innovative solid-state welding technologies that would enable to welding of lightweight and high-performance materials. In this work, 3105-H18 Aluminium alloy (Al) and pure Copper (Cu) specimens with 0.5 mm thickness have been ultrasonically welded in a dissimilar (Al-Cu) manner. Optimization of process parameters of ultra-sonic welding has been carried out through full factorial method, three levels of variables considered for this experimental studies namely, weld pressure, amplitude, and time, also each variable interaction with welding strength has been studied. Additionally, micro-hardness and microstructure investigation in welded joints has been studied. The result shows that the weld strength greatly influenced weld amplitude at a medium and higher level of weld pressure. The interface micro-hardness of the welded joint has lower compared to the base metal.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 887-892
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Forge Application on Microstructural and Mechanical Properties of AISI 316 Using Direct Drive Friction Welding Process
    Autorzy:
    Hassan, Jabbar A.
    Boukharouba, T.
    Miroud, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2125543.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction welding
    forge phase
    micro-hardness
    ultimate tensile strength
    X-ray diffraction
    Opis:
    Present study introduces effect of forge application and elimination on microstructural and mechanical properties of AISI 316 during friction welding. Temperature measurements, microstructure, micro-hardness, tensile test, scanning electron microscopy and X-ray diffraction were evaluated. Maximum temperature recorded was 819°C while forge was applied between 357°C-237°C. Thermo-mechanically affected zone and highly plastically deformed zone were created at the interface at elimination and application of forge respectively. Ultimate tensile strength decreased and ductility increased when forge elimination compared to forge application. Tensile fracture was occurred adjacent to the welding interface for both cases, though, after forge application, ductile fracture mode and cleavage features through the fingerprints were observed in the fracture morphology. Redistribution and concentration of gamma iron in 111 level after forge application and heat treated of AISI 316.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 987--992
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Improvement of Surface Properties of SKD61 Powder on S45C Using Laser Cladding
    Autorzy:
    Kim, Cheol-Woo
    Yoo, Hyo-Sang
    Powiązania:
    https://bibliotekanauki.pl/articles/2174572.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser cladding
    Micro Vickers hardness
    microstructure
    polarization curve
    Opis:
    In this study, we investigated the effect of cladding on structural carbon steel (S45C) using 5%Cr-1.5%Mo-Fe powder (SKD61), which is expected to show economically efficient production of die-casting parts. The process conditions were performed under argon atmosphere using a diode laser source with specialized wavelength of 900-1070 nm, and the output conditions were 3, 4, and 5 kW, respectively. After the cladding was completed, the surface coating layer’s shape and the microstructure were analyzed. The hardness test was carried out with Micro Vickers hardness tester under 500 gram-force along the normal line at the interval of 0.2 mm from the surface to core direction on the cross-sectional area. In addition, polarization curve test of the surface coating layer was performed to investigate the corrosion resistance characteristics.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1465--1468
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric Analysis on the Progression of Mechanical Properties on FSW of Aluminum-Copper Plates
    Autorzy:
    Deepati, Anil Kumar
    Alhazmi, Waleed
    Zakri, Waleed
    Shaban, Essam
    Biswas, Pankaj
    Powiązania:
    https://bibliotekanauki.pl/articles/2180606.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    tool geometry
    process parameters
    micro-hardness
    tensile strength
    weld microstructure
    Cu alloy
    Al alloy
    Opis:
    The contemporary work manifests that friction stir welding (FSW) is a viable avenue for joining AA1100 aluminium (Al) to C12200 copper (Cu) plates. In this present study, the response of distinctive welding parameters (viz. tool geometries, tool rotational speed, tool travel speed, and tool plunging depth) on weld quality has been investigated. The present work focused on both microstructural investigation and mechanical properties examination. It has been observed that the process parameters have significant effects on weld quality. The design of the experiments has been executed considering four welding input parameters in two variables and selected L-16 orthogonal array to limit the experimental replications. It has been observed that good quality of welds produced by keeping the tool pin offset around 4mm towards the aluminium side and 2mm towards the copper side. And it has also been noticed that right-hand threaded tool pins are giving good weld quality compared to left-handed thread. The joint efficiencies for the welds E2, E14 which were welded by RHT tools were 75.3% and 74.61% and the Strength (UTS) of the welds for the same tools exhibit’s greater than the LHT tools i.e., 98 and 95Mpa. Moderate hardness values are observed for the same welds E1 and E14 with the parameters 1100rpm, 98welding speed, and 1.6mm tool plunge depth. . It also noticed that the weld quality can be significantly enhanced by using proper tool plunge and tool pin geometries compared to the other process parameters.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 2; 168--178
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Mechanical Properties of Explosive Welded Mg/Al Bimetal
    Struktura i właściwości mechaniczne połączenia uzyskanego metodą zgrzewania wybuchowego bimetalu Mg/Al
    Autorzy:
    Balga, D.
    Ostroushko, D.
    Saksl, K.
    Mazancová, E.
    Milković, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/354953.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    explosive welding
    Mg/Al bimetal
    micro-hardness
    micro-diffraction
    PETRA III
    zgrzewanie wybuchowe
    bimetal Mg/Al
    mikrotwardość
    mikrodyfrakcja
    Opis:
    In the article we analyzed shape, local mechanical properties, chemical and phase composition of Magnesium/Aluminium cladded material prepared by explosion welding. In particular we focus our investigation on Mg/Al interface and areas close to the joint. Hardness of the joined materials measured far from their interface is similar for both materials, however in the region of interface the hardness drops down by 40%. Phase transformations in the interface was examined by a hard X-ray micro-diffraction experiment performed at beamline P07 at PETRA III at the energy of 99 keV which helped us identify in Al: fcc-Al, Al2 Cu tetragonal and Al7 Cu2 Fe tetragonal and in Mg: hcp-Mg, Mg2 Si cubic phases. In the interface we haven’t observed any new intermetallics, but computation of lattice parameters and profiles of Al and Mg peaks proved an existence of solid solution with different gradient of chemical composition.
    W pracy analizowano kształt, lokalne właściwości mechaniczne, chemiczne oraz składników fazowych Mg/Al materiałów platerowanych otrzymanych metodą zgrzewania wybuchowego. W szczególności, skupiono się na badaniach połączenia fazy Mg/Al oraz obszarów znajdujących się w pobliżu połączenia. Twardość połączonych materiałów badano w znacznej odległości od warstwy samego połączenia, i zauważono, iż jest ona podobna do twardości materiałów wyjściowych, jednakże twardość w regionie warstwy połączenia spada o 40%. Przemiana fazowa w warstwie połączenia została poddana badaniom mikrodyfrakcyjnym, na urządzeniu P07, PETRA III o energii 99 keV, dzięki której zidentyfikowano w Al fazy tetragonalne: fcc-Al, Al2 Cu oraz Al7 Cu2 Fe i w Mg: heksagonalna Mg oraz kubiczna Mg2 Si. W warstwie połączenia nie zaobserwowano żadnych innych nowych faz międzymetalicznych. Obliczone parametry sieci komórki elementarnej i profile pików Al i Mg potwierdzają występowanie roztworu stałego z różnym gardientem składu chemicznego.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 4; 1593-1597
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Molybdenum on the Thermal, Structural Properties and Micro Hardness of AlSi10Mg(Cu) Alloy
    Autorzy:
    Hajduch, P.
    Bolibruchova, D.
    Djurdjevic, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/383004.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy AlSiMgCu
    influence of molybdenum
    thermal analysis
    micro hardness
    stop AlSiMgCu
    wpływ molibdenu
    analiza termiczna
    mikrotwardość
    Opis:
    This work is dealing with the impact of molybdenum on the structure properties of commercial cast AlSi10Mg(Cu) alloy. The solidification path of AlSi10Mg(Cu) alloy with various content of molybdenum has been investigated using cooling curve techniques. The samples for testing have been poured into permanent steel mold. The content of molybdenum has been varied from 0 to 0.20 wt. %.The desired chemical composition was achieved by adding of master alloy AlMo10 into commercial AlSi10Mg(Cu) alloy. The micro hardness of as cast alloys with different content of molybdenum has been measured. The microstructure and EDX analysis from the casted samples has been carried out. The results show that molybdenum in commercial AlSi10Cu(Mg) alloy precipitate in the interdendritic region isolated in the form of Al(FeMnMoMg)Si rich intermetallic. The increased content of molybdenum increase slightly liquidus temperature, prolonging precipitation of the last eutectic and surprisingly decrease the micro hardness of commercial alloy for approximately 16 %.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 19-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of selected properties and surface quality of cured pre-impregnated carbon-fiber fabrics after exposure to sulphuric acid
    Autorzy:
    Kojnoková, Tatiana
    Nový, František
    Markovičová, Lenka
    Harea, Evgheni
    Harea, Evghenii
    Powiązania:
    https://bibliotekanauki.pl/articles/26081735.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    tkaniny węglowe
    żywica epoksydowa
    zmiana wagi
    jakość powierzchni
    carbon fabrics
    epoxy resin
    micro-hardness
    weight change
    surface quality
    Opis:
    This paper deals with changes in selected properties of composite material and surface degradation after exposure to an acidic environment. A carbon fiber-reinforced composite (CFRP) produced from prepregs was tested. The weight change, micro-hardness, and surface degradation of the CFRP composite made of cured pre-impregnated laminates were evaluated in this study. Material consisting of a DT121R epoxy resin matrix with high reactivity and high viscosity, with two reinforcing carbon fabrics layers, is characterized by a low value of tensile strength. Evaluation of changes in the material properties was performed before and after exposure to specific environmental conditions, which are achieved by using a chemical solution of 15% H2SO4 at various temperatures. Subsequently, the effect of 15% H2SO4 at various temperatures on the material properties was monitored. The specimens were immersed in the solution for up to 3 and 6 weeks at the temperatures of 23°C, 40°C, and 60°C. It was found out, that the degradation of the composite material is conditioned by the aging of the epoxy resin (matrix). Carbon fibers (reinforcement) are relatively stable. The weight change, micro-hardness, and surface quality depend on the time of exposure to acidic solution and temperature. The micro-hardness tests show a significant influence on exposure time. The biggest changes in weight change and surface quality of the CFRP composite were observed after exposure at the temperature of 60°C.
    Źródło:
    Production Engineering Archives; 2023, 29, 1; 1--6
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Influence of Vibratory Machining on Titanium Alloys Properties
    Autorzy:
    Bańkowski, D.
    Spadło, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/947596.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium alloy
    vibratory machining
    finishing treatment
    surface roughness
    micro-hardness
    stop tytanu
    obróbka wibracyjna
    obróbka wykańczająca
    chropowatość powierzchni
    mikrotwardość
    Opis:
    This article proposes these of vibratory machining to Ti-6Al-4V titanium alloy as finishing treatment. Titanium alloy was used in the aerospace industry, military, metallurgical, automotive and medical processes, extreme sports and other. The three-level three-factor Box-Behnken experiment examined the influence of machining time of vibratory machining, the type of mass finishing media used and the initial state of the surface layer on the mass loss, geometric structure of the surface, micro hardness and the optimal process parameters were determined. Considerations were given the surfaces after milling, after cutting with a band saw and after the sanding process. The experiment used three types of mass finishing media: polyester, porcelain and metal. Duration of vibratory machining treatment was assumed to be 20, 40, 60 minutes. The form profiles before and after vibratory machining were determined with the Talysurf CCI Lite - Taylor Hobson optical profiler. Future tests should concern research to carry out tests using abrasive pastes with a larger granulation of abrasive grains, to carry out tests for longer processing times and to determine the time after which the parameters of geometrical structure of the surface change is unnoticeable.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 3; 47-52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of High-Voltage Electromagnetic Pulses on Technological Properties of Diamond Crystals and Kimberlite Rock-Forming Minerals
    Wpływ wysokonapięciowych impulsów elektromagnetycznych na właściwości technologiczne kryształów diamentu i minerałów tworzących skały Kimberlite
    Autorzy:
    Anashkina, N. E.
    Bunin, Igor Zh.
    Khachatryan, G. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/318108.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    kimberlit
    diamenty
    impulsy nanosekundowe wysokiego napięcia
    hydrofobowość
    mikrotwardość
    flotowalność
    kimberlite
    diamonds
    high-voltage nanosecond pulses
    hydrophobicity
    micro-hardness
    floatability
    Opis:
    For optimization of diamond processing technology the influence of nanosecond high voltage pulses on mechanical and technological properties of diamond crystals and kimberlite rock-forming minerals (calcite, olivine, serpentine) was investigated. Using methods of Fourier Transform Infrared Spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), microscopy and mikrohardness measurement the changes of structural, physic-chemical surface properties, and microhardness of minerals as the result of impacts, was studied. Non-thermal impacts caused a decrease of kimberlite rock-forming minerals microhardness in general to 40–66% as the result of surface microstructure destruction which is caused by formation of micro cracks, traces of surface breakdown and other defects. At the same time, the pulse energy impact on natural diamonds led to formation of B2 type crystal lattice microsift defects, elevated concentration of which increases the hardness properties of crystals. The obtained result indicates possibility of applying pulsed energy effects to improve the softening efficiency of diamond-bearing kimberlites rock-forming minerals without damaging the diamond crystals and ensuring their preservation by the subsequent grinding of ores. The effect of increasing the natural diamonds flotation activity by 14% (from 47% to 61%) was experimentally established as a result of processing diamond crystals with nanosecond pulses (~ 10–50 sec), which indicates the principal possibility of using pulsed energy impacts to intensify the diamond flotation during processing diamond-bearing kimberlites.
    W celu optymalizacji technologii przeróbki diamentów zbadano wpływ impulsów wysokiego napięcia nanosekundowego na właściwości mechaniczne i technologiczne kryształów diamentu i minerałów tworzących skały kimberlitowe (kalcyt, oliwin, serpentynit). Przy pomocy metod spektroskopii w podczerwieni z transformacją Fouriera (FTIR), rentgenowskiej spektroskopii fotoelektronowej (XPS), mikroskopii i pomiaru mikrotwardości badano zmiany strukturalnych, fizykochemicznych właściwości powierzchni oraz mikrotwardości minerałów w wyniku uderzeń. Uderzenia nietermiczne spowodowały zmniejszenie mikrotwardości minerałów tworzących skały kimberlitowe ogólnie do 40–66% w wyniku zniszczenia mikrostruktury powierzchni, spowodowanego powstawaniem mikropęknięć, śladów rozpadu powierzchni i innych wad. Jednocześnie wpływ energii impulsu na naturalne diamenty doprowadził do powstania defektów mikroprzesunięcia sieci krystalicznej typu B2, których podwyższone stężenie zwiększa właściwości twardości kryształów. Uzyskany wynik wskazuje na możliwość zastosowania efektów pulsacji energii w celu poprawy wydajności zmiękczania zawierających diamenty minerałów tworzących skały jak kimberlity, bez uszkadzania kryształów diamentu i zapewnienia ich zachowania w czasie późniejszego mielenia rudy. Efekt zwiększenia naturalnej aktywności flotacyjnej diamentów o 14% (z 47 do 61%) ustalono eksperymentalnie w wyniku przetwarzania kryształów diamentu za pomocą impulsów nanosekundowych (~ 10–50 sekund), co wskazuje na główną możliwość wykorzystania energii pulsacyjnej. Impulsy wpływają na intensyfikację flotacji diamentów podczas przetwarzania kimberlitów zawierających diamenty.
    Źródło:
    Inżynieria Mineralna; 2019, 21, 1/2; 133-138
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hardness investigation of conventional, bulk fill and flowable dental composites
    Autorzy:
    Georgiev, G.
    Dikova, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055754.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    resin-based composites
    micro-hardness
    light intensity
    irradiation time
    layer thickness
    kompozyty żywiczne
    mikrotwardość
    natężenie oświetlenia
    czas nasłonecznienia
    grubość warstwy
    Opis:
    Purpose: of the present paper is to investigate the micro-hardness of three types of resin-based composites – conventional, bulk fill and flowable. Design/methodology/approach: Cylindrical specimens with a diameter of 5 mm and thicknesses of 2, 3 and 4 mm were made from each composite. They were light cured for 20, 40 and 60 s with light intensity of 600, 1000 or 1500 mW/cm2. The Vickers micro-hardness was measured on the top and bottom surface of the specimens. Findings: The highest micro-hardness was measured in bulk fill composite, followed by conventional and the lowest was measured in the flowable one. Increasing the light intensity leads to increase of the micro-hardness on both surfaces of the three composites. The increase of the irradiation time results in increase of the micro-hardness mainly on the bottom surface of the composites. The change of the layer thickness influences the conventional and the flowable composites and almost does not affect the hardness of the bulk fill composite. Research limitations/implications: The limitations of this study concerns to the values of the light intensity, which are defined by the light curing unit (LCU) used. There are many LCUs on the market; consequently, constant investigations of dental composites micro-hardness are needed. Practical implications: The investigation of the micro-hardness of the three types of composites in different modes would be very helpful for clinicians to obtain successful polymerization of composite restorations in their everyday practice. Originality/value: The micro-hardness of three types resin-based dental composites – conventional, bulk fill and flowable is investigated and compared in varying of three mode parameters – light intensity, curing time and layer thickness.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 109, 2; 68--77
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of 0.2% Addition of Mg, Co and Ce on Microstructure and Mechanical Properties of 1xxx Series Aluminium Alloy Castings Designed for Overhead Transmission Lines
    Autorzy:
    Koprowski, Paweł
    Lech-Grega, M.
    Wodzinski, Łukasz
    Augustyn, Bogusław
    Boczkal, Sonia
    Uliasz, Piotr
    Ożóg, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2048868.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro-additions
    aluminium
    hardness
    microstructure
    overhead transmission lines
    Opis:
    The effect of 0.2% addition of Mg, Co and Ce to 99.9% cast aluminium was studied by evaluation of changes in microstructure and mechanical properties. The microstructure was analyzed by scanning electron microscopy and transmission electron microscopy. The Al99.9 alloy contained only Al-Fe-Si phase particles. Similar Al-Fe-Si particles were observed in alloy with 0.2% Mg addition, because this amount of magnesium was fully dissolved in the solid solution. The addition of cobalt resulted in the formation of Al9.02Co1.51Fe0.47 phase particles assuming the shape of eutectic plates. The electron backscattered diffraction map made for the alloy with 0.2% Co addition showed numerous twin boundaries with distances between them in the range from 10 to 100 µm. The addition of cerium was located in the grain boundary area. Cerium also gave rise to the formation of two types of particles, i.e. Al4Ce and Al-Ce-Fe-Si. The Al-Ce-Fe-Si phase is a nucleation site for the Al4Ce phase, which forms eutectic plates. The results showed that the introduction of additives increases the mechanical properties of the cast materials. The 99.9% cast aluminium has a hardness of 16.9 HB. The addition of 0.2% by weight of Mg, Co, Ce increases this hardness to 21.8 HB, 22.6 HB and 19.1 HB, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 303-309
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Laser Preheating AISI 4140 Specimens for Micro-Forging
    Autorzy:
    Jung, C.
    Lee, M. G.
    Jeon, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/351766.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser preheating
    micro-forging
    fatigue strength
    ultrasonic fatigue test
    hardness
    Opis:
    Many high performance and permanent service parts require suitable material characteristics-high fatigue strength is one of the most important characteristics. For this reason, surface treatment processes are essential to increase the material performance and avoid the use of costly ineffective material. There exist various surface treatment processes for various applications. Each process has advantages and disadvantages and hybridization can solve various problems. The micro-forging process delivers a controlled and uniform surface hardness, but the depth of the forged surface is limited. On the other hand, laser heat treatment can increase the hardness drastically, but the surface may become brittle, which reduces the fatigue life. Laser-assisted micro-forging is a novel hybrid process of laser heat treatment and micro-forging that has the potential to increase the forging depth and relax the stress caused by the high temperature of the forging process. This study examines the effect of laser preheating in the micro-forging of AISI 4140. The processes were varied as follows: no treatment, micro-forging only, and laser-assisted micro-forging. The fatigue strength of the specimens was examined by means of an ultrasonic fatigue tester and then compared. The microstructural changes were investigated with respect to the processes by using scanning electron microscopy. In conclusion, it was confirmed that the laser preheating auxiliary forging affects the fatigue life. It was confirmed that the fatigue life was the mostly increased in 550°C temperature laser preheating micro forging process and the temperature was identified as the most important factor.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1209-1213
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and Tribological Analysis of Monolith and Coating Polyetheretherketone
    Analiza właściwości mechanicznych i tribologicznych polieteroeteroketonu w postaci monolitycznej i powłoki
    Autorzy:
    Otto, Mateusz
    Zimowski, Sławomir
    Sikora, Wojciech
    Moskalewicz, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/188181.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    PEEK
    twardość
    współczynnik tarcia
    wskaźnik zużycia objętościowego
    odporność na mikrouszkodzenia
    hardness
    coefficient of friction
    wear rate
    Micro Mar Resistance
    Opis:
    W pracy dokonano analizy porównawczej właściwości mikromechanicznych oraz tribologicznych polieteroeteroketonu (PEEK) w postaci monolitycznej i powłoki. Powłoka PEEK 708 została osadzona metodą elektroforezy na płaskim podłożu ze stopu tytanu. Właściwości mikromechaniczne zostały zbadane metodą indentacyjną przy użyciu wgłębnika Vickersa oraz w teście zarysowania. Na podstawie badań wyznaczono twardość Vickersa (HV), moduł sprężystości (E), twardość zarysowania (HS) oraz odporność na mikrouszkodzenia (MMR). Właściwości tribologiczne zdefiniowano poprzez współczynnik tarcia (fs i fw), który wyznaczono zarówno w teście zarysowania oraz podczas tarcia w układzie typu kula–tarcza. Wyniki badań wskazują, że pomimo niedużo większej twardości Vickers’a (HV) powłoki PEEK 708 (HV = 350 MPa, HS = 300 MPa) względem monolitycznego PEEK (HV = 300 MPa, HS = 210 MPa), występuje niemal 40% różnica w ich twardościach zarysowania (HS). Z przeprowadzonej analizy wynika, że metody wyznaczania parametrów mikromechanicznych oraz tribologicznych stosowane dla materiałów monolitycznych PEEK sprawdzają się w badaniach powłok polimerowych PEEK. W określonych warunkach badań nie stwierdzono wpływu materiału podłoża na otrzymane wyniki dla powłoki PEEK 708.
    In this work, a comparative analysis of the micromechanical and tribological properties of polyetheretherketone (PEEK) in bulk and coating form was performed. The PEEK 708 coating was applied on a Ti6Al4V titanium alloy flat specimen using the electrophoretic deposition method. The micromechanical properties were determined through indentation tests performed using the Vickers method and scratch tests. Based on research work, the Vickers hardness (HV), elastic modulus (E), scratch hardness (HS), and Micro Mar Resistance (MMR) were determined. The tribological properties were defined by the coefficient of friction (fs and fw), which was obtained in scratch tests and ball-on-disk tests. The results of this research indicate, despite the slightly higher Vickers hardness (HV) of the PEEK 708 coating (HV = 350 MPa, HS = 300 MPa) relative to PEEK bulk (HV = 300 MPa, HS = 210 MPa), that there is an almost 40% difference between the scratch hardness (HS) values of these PEEK forms. It appears from the result analysis in this paper that testing methods to determine the micromechanical and tribological properties of PEEK in monolith form can be used for both PEEK coatings. Under certain test conditions, the impact of the substrate properties on the results of the PEEK 708 coating was not found.
    Źródło:
    Tribologia; 2019, 286, 4; 73-86
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ obróbki cieplno-chemicznej na zmiany mikrogeometrii powierzchni wyrobów
    The influence of thermochemical treatment on the changes of micro geometry of product surface
    Autorzy:
    Berkowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/212159.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
    Tematy:
    mikrogeometria powierzchni
    obróbka cieplno-chemiczna
    azotowanie
    warstwa wierzchnia
    rozkłady twardości
    surface micro geometry
    thermochemical treatment
    nitriding
    top layer
    hardness distributions
    Opis:
    Mikrogeometria powierzchni jest waSna dla wyrobów i narzędzi pracujących w warunkach tarcia. Badania wykazały, że obróbka cieplno-chemiczna, zwłaszcza azotowanie – niezaleSnie od metody - powoduje wyraźny wzrost chropowatości powierzchni gładkiej, o małej wartości parametru Ra. Wykazano ponadto, że dla wybranego procesu, istnieje optymalna mikrogeometria powierzchni, która po obróbce cieplno-chemicznej prawie nie ulega zmianie.
    Surface micro geometry is essential for products and tools working under friction conditions. Investigation has shown that thermochemical treatment, particularly nitriding, results in clear roughness increase of smooth surface with low value of Ra parameter regardless of the method of nitriding. It has also been shown that, for a selected process, there is an optimum surface micro geometry which almost does not change after thermochemical treatment.
    Źródło:
    Obróbka Plastyczna Metali; 2012, 23, 3; 129-137
    0867-2628
    Pojawia się w:
    Obróbka Plastyczna Metali
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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