Wyniki wyszukiwania - BazTech

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Microstructure and Mechanical Properties of Stainless Steel/Aluminum Multilayer Composites by One-Step Explosive Welding

Hu Xiaoyan, Liu Yingbing, Yang Li, Huang Xiaochen

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 3

1211--1217

EN

The stainless steel/aluminum multilayer composites were prepared by one-step explosive welding using ammonium nitrate explosive with two different thicknesses. The microstructure and mechanical properties of the multilayer composites were examined. There is a thin metallurgical melting zone at each bonding interface, consisting mostly of iron and aluminum elements. However, the micro-crack appears in the second metallurgical bonding zone obtained using the explosive of 24 mm thickness. The micro-hardness values at the four bonding interfaces are higher than those of bulk 1060 aluminum and 304 stainless steel. The yield strength of the multilayer composites obtained in the two cases is higher than that of the original 304 stainless steel while the tensile strength is between those of the original 1060 aluminum and 304 stainless steel. Meanwhile, the tensile strength and yield strength of multilayer composites obtained by explosive welding with explosive of 20 mm thickness are relatively higher.

2

Microstructure and Mechanical Properties of Stainless Steel/Aluminum Multilayer Composites by One-Step Explosive Welding

Hu Xiaoyan, Liu Yingbin, Yang Li, Huang Xiaochen

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 3

939--946

EN

The stainless steel/aluminum multilayer composites were prepared by one-step explosive welding using ammonium nitrate explosive with two different thicknesses. The microstructure and mechanical properties of the multilayer composites were examined. There is a thin metallurgical melting zone at each bonding interface, consisting mostly of iron and aluminum elements. However, the micro-crack appears in the second metallurgical bonding zone obtained using the explosive of 24 mm thickness. The microhardness values at the four bonding interfaces are higher than those of bulk 1060 aluminum and 304 stainless steel. The yield strength of the multilayer composites obtained in the two cases is higher than that of the original 304 stainless steel while the tensile strength is between those of the original 1060 aluminum and 304 stainless steel. Meanwhile, the tensile strength and yield strength of multilayer composites obtained by explosive welding with explosive of 20 mm thickness are relatively higher.

3

Analiza możliwości wykorzystania ultradźwiękowej techniki NDT w diagnostyce instalacji kompozytowych do transportu hydraulicznego materiałów erozyjnych

Borkowski Bartłomiej, Mączka Tadeusz, Harapińska Ewa, Machała Piotr

Wiadomości Elektrotechniczne

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2020

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R. 88, nr 2

7--10

PL

W artykule zaproponowano metodykę wykonywania ultradźwiękowych badań nieniszczących NDT do oceny stanu technicznego instalacji transportujących materiały erozyjne. Testy NDT wykonano na laboratoryjnym modelu instalacji technologicznej składającej się z elementów z wyłożeniem trudnościeralnym – pompa wirowa, rury stalowe, kolana hamburskie, hydrocyklon i zbiornik na pulpę. Sprawdzono możliwości diagnostyczne opracowanego ultradźwiękowego systemu NDT, wykorzystującego metodę echa do pomiaru grubości próbek wielowarstwowych typu stal z wyłożeniem trudnościeralnym z ceramiki polimerowej (CP) na bazie SiC oraz kompozyt szkłoepoksydowy z wyłożeniem ceramiki polimerowej SiC. Zaproponowano określoną metodykę dokonywania prawidłowej diagnostyki w celu identyfikacji grubości poszczególnych warstw i wskazano dalsze kierunki rozwoju opracowywanej metody diagnostycznej.

EN

The article proposes a methodology for performing NDT ultrasonic non-destructive testing to assess the technical condition of installations transporting erosive materials. NDT tests were performed on a laboratory model of a technological installation consisting of elements with wear-resistant lining - a centrifugal pump, steel pipes, steel pipe elbows, a hydrocyclone and a pulp tank. The diagnostic capabilities of the developed ultrasonic NDT system using the echo method to measure the thickness of steel multilayer samples with wear-resistant polymer ceramics (CP) lining based on SiC and a glass-epoxy composite lined with SiC polymer ceramics were tested. A specific methodology for making correct diagnostics was proposed in order to identify the thickness of individual layers and further development directions of the developed diagnostic method were indicated.

4

Wybrane własności warstwowych materiałów kompozytowych otrzymanych z proszków żelaza i aluminium w procesie kucia w matrycach zamkniętych

Szczepanik S., Wojtaszek M., Nikiel P.

Kompozyty

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2010

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R. 10, nr 4

385-391

PL

Przedstawiono wyniki badań kucia matrycowego materiałów warstwowych, otrzymanych z wyprasek wytworzonych z mieszanek proszków żelaza i aluminium przez prasowanie w temperaturze pokojowej lub ich wstępne zagęszczanie w wyniku kucia na gorąco w matrycy zamkniętej. Ocenie poddano wpływ składu chemicznego poszczególnych warstw, sposobu ich ulokowania w wyprasce oraz sposobu przetworzenia na wybrane właściwości tworzyw. Zastosowano warstwy o zmiennych udziałach masowych składników przy ich symetrycznym lub asymetrycznym ułożeniu w wyprasce. Formowanie tworzyw warstwowych realizowano przez kucie w matrycach zamkniętych w warunkach pseudoizotermicznych stemplami płaskimi lub kształtowymi. Badano próbki pobrane z odkuwek w stanie po kuciu płaskim stemplem oraz stemplem kształtowym, wyznaczając ich wytrzymałość na zginanie oraz na ściskanie w temperaturze pokojowej, w zależności od ich budowy oraz od sposobu ułożenia próbki w odniesieniu do kierunku przyłożenia siły podczas realizacji prób.

EN

The aim of the research in this paper is to determine the influence of hot deformation of the layer preforms obtained from a mixture of iron and aluminium powders as well as the influence of layers geometry of hot consolidated layer composite samples on the density and some mechanical properties of these materials. The properties of materials after closed-die forging performs, obtained from mixtures of aluminum and iron powder using flat or shape punches are presented. Chemical composition of layers, their position in performs and forming method were investigated to evaluate properties of products. The position of layers in initial preforms were symmetrical and asymmetrical. Cold pressed layer performs were hot consolidated by close-die forging at 485°C, in quasi-isothermal conditions. Influence of the chemical composition of layers, their position during bend and compression tests were investigated. Bend strengths of composite samples were in the range 197 to 230 MPa for specimens with symmetrical position of layers and 144 to 233 MPa for specimens with asymmetrical position of layers, depending on chemical composition and layer geometry and loading by test. Bend strengths of layer specimens taking from webs of shape forgings were 222-231 MPa for symmetrical layer structure and 182-271 MPa for asymmetrical layer structure. The higher compression stress 260 MPa were for layer specimens with layer structure B-C-B. Additionally, some information about condition of contact surfaces between components give macrostructure observations. Distribution of components on cross-section, calculated using program Larstran Shape confirm qualitative macrostructure results observation and material flow during shapping. These data can contribute to design of layer materials for specific applications utilising the PM route and closed-die forming. The knowledge of specimen properties, as a function of the layers arrangement allows for choice the most favourable variant to design required properties of the product.

5

Wpływ parametrów prowadzenia procesu elektroosadzania na strukturę i własności metalicznych nanokompozytów wielowarstwowych

Tokarz A., Wolkenberg A., Kęsik M.

Kompozyty

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2002

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R. 2, nr 3

85-90

PL

Przedstawiono wpływ potencjału osadzania na skład chemiczny pojedynczych warstw Co i Cu z jednego roztworu. Na podstawie badań składu chemicznego metodą SIMS i EDX oraz badań polaryzacyjnych przeprowadzono dobór parametrów elektrochemicznego osadzania pojedynczych warstw Co i Cu oraz Ni i Cu. Na podstawie badań XRD przedstawiono zależność całkowitej grubości kompozytu wielowarstwowego Cu-Ni na jego strukturę krystalograficzną i w wyniku tego na własności mechaniczne i magnetyczne supersieci Cu/Ni i Cu/Co.

EN

The potentiostatic electrochemical method from single electrolyte bath, based on sulphamate (Ni) and sulphate (Co, Cu), has been applied for Cu/Ni and Cu/Co superlattices deposition. Different kinds of methods for the multilayer nanocomposites deposition and its application for different technical fields are presented in Table 1. The experimental setup used for preparation Cu/Ni and Cu/Co systems is presented in Figure 1. The polarisation data for two kinds of the superlattices (Cu/Ni, Cu/Co) are presented in Figure 2. The ranges of the deposition potential where Cu and Ni or Co ions are reduced were established. The correctness of the Cu and Ni deposition potentials for Cu/Ni system was checked by SIMS method (Fig. 3). The chemical composition of the single layers as a function of the deposition potentials was measured by EDX method (Fig. 4a). The correlation of the cathodic current with concentration of the Cu and Co in the single layers deposited at different potentials was investigated (Fig. 4b). Chemical composition of single layers was investigated with SIMS. Both for two systems the Cu layers deposited at chosen potentials were almost pure (99.8% Cu) while Ni (Co) layers contained 2:5% Cu. The changes of crystallographic orientation (from XRD investigations) as a function of the total thickness of the deposit are shown (Fig. 5). The dependence of the mechanical properties on the total thickness of the deposit is presented in Table 2. In this work the electrochemical parameters of the deposition process are presented. The structural properties of the superlattices depend on the total thickness of the deposit. The changes in the mechanical and magnetoelectrical properties are due to changes in the preferential crystallographic orientations.