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Wyświetlanie 1-15 z 110
Tytuł:
Mechanical and Microstructural Response of Near Beta Ti Alloys to Hot Tensile Testing
Autorzy:
Abbasi, S. M.
Momeni, A.
Daraee, M.
Akhondzadeh, A.
Mirsaeed, S. G.
Powiązania:
https://bibliotekanauki.pl/articles/351391.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermomechanical processing
hot deformation
dynamic softening
yield-point phenomena
hot ductility
Opis:
Hot tensile tests were carried out on Timetal-125 and Timetal-LCB near beta Ti alloys at temperatures in range of 600-1000°C and constant strain rate of 0.1 s-1. At temperatures below 700-800°C, the homogenuous and total strains for Timetal-LCB were greater than those for Timetal-125. In contrast, at temperatures over 800°C, Timetal-125 showed better hot ductility. The yield point phenomena was observed in Timetal-LCB at all temperatures. Unlikely, for Timetal-125, it was observed only at temperatures over 800°C. The weaker yield point phenomena in Timetal-125 could be attributed to the negative effect of Al on the diffusion of V. At all temperatures Timetal-LCB exhibited higher strength than Timetal-125. It was found that there should be a direct relationship between the extent of yield point phenomena and strength and dynamic softening through hot tensile testing. It was observed that at temperatures beyond 800°C (beta phase field in both alloys) dynamic recrystallization can progress more in Timetal-125 than in Timetal-LCB. These results were in good agreement with the better hot ductility of Timetal-125 at high temperatures. At low temperatures, i.e. below 700-800°C, partial dynamic recrystallization occurs in beta and dynamic globularization in alpha phase. These processes progress more in Timetal-LCB than in Timetal-125.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 815-823
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hot Processing of Cast and PM Ti-6Al-4V Alloy
Autorzy:
Wojtaszek, M.
Śleboda, T.
Korpała, G.
Powiązania:
https://bibliotekanauki.pl/articles/352910.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloy
hot compaction
hot forging
thermo-mechanical parameters
microstructure
properties
Opis:
Quantitative and qualitative evaluation of the influence of the applied sample morphology as well as parameters of deformation on the microstructure and selected properties of Ti-6Al-4V alloy after deformation was presented. Both cast Ti-6Al-4V alloy and powder compacts were used as the material under investigation. P/M preform was produced from the mixture of elemental powders, by hot compaction. The samples of compacts as well as cast alloy were subjected to plastometric tests under various conditions. The influence of the state of the investigated Ti-6Al-4V alloy on the character of flow curves was determined. The microstructure and hardness after deformation were evaluated and compared. Basing on the results of plastometric tests, the suitable thermo-mechanical parameters of forging of Ti-6Al-4V alloy were determined. The charge was machined from the compacts and from cast material, and both types of forging stock were hot-forged. The microstructure as well as hardness of the forgings were compared.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1115-1120
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Forming Process of Energy-Absorbing Elements made from 7000 Series High-Strength Aluminum Alloy
Autorzy:
Jaśkiewicz, K.
Skwarski, M.
Polak, S.
Gronostajski, Z.
Krawczyk, J.
Kaczyński, P.
Chorzępa, W.
Powiązania:
https://bibliotekanauki.pl/articles/355556.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloys
hot forming
Opis:
The paper covers the research on the process of solutionizing of 7075 aluminum alloy in cold tools during the stamping of a high-strength structural element (B-pillar’s base). For technological reasons, in order to obtain high strength parameters of the 7075 alloy, it is necessary to carry out a solutionization process, which allows to obtain dispersion strengthening during ageing process. Properly performed heat treatment of the alloy increases the strength of the material to approx. 600 MPa. The combination of the process of solutionization with simultaneous shaping is aimed at improving and simplifying technological operations of aluminum alloy stamping, shortening the duration of the manufacturing process and reducing production costs. The manufactured lower part of the B-pillar will be used for the verification of the validity of the developed method. During the experiment, a series of stamping tests were carried out, in which the lubricants, pressure and position of the upper and lower blankholders were the variables. The obtained results allow to estimate the influence of the cooling conditions on the strength of the drawpieces obtained after the process of artificial ageing. In order to verify and analyse the results more quickly, a numerical simulation was carried out.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 697-705
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Hot Deformation Behavior of CuFe2 Alloy
Autorzy:
Schindler, I.
Sauer, M.
Kawulok, P.
Rodak, K.
Hadasik, E.
Jabłońska, M. Barbara
Rusz, S.
Ševčák, V.
Powiązania:
https://bibliotekanauki.pl/articles/353206.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper alloy CuFe2
hot ductility
stress-strain curves
hot deformation activation energy
Opis:
Nil strength temperature of 1062°C and nil ductility temperature of 1040°C were experimentally set for CuFe2 alloy. The highest formability at approx. 1020°C is unusable due to massive grain coarsening. The local minimum of ductility around the temperature 910°C is probably due to minor formation of γ-iron. In the forming temperatures interval 650-950°C and strain rate 0.1-10 s-1 the flow stress curves were obtained and after their analysis hot deformation activation energy of 380 kJ·mol-1 was achieved. Peak stress and corresponding peak strain values were mathematically described with good accuracy by equations depending on Zener-Hollomon parameter.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 701-706
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Strontium Inoculation on Hot Tearing in Aluminium Alloys
Autorzy:
Bolibruchová, D.
Bruna, M.
Pastirčák, R.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/352703.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot tearing
aluminium alloys
strontium
Opis:
Main aim of submitted work is evaluation and experimental verification of inoculation effect on Al alloys hot-tear sensitivity. Submitted work consists of two parts. The first part introduces the reader to the hot tearing in general and provides theoretical analysis of hot tearing phenomenon. The second part describes strontium effect on hot tearing susceptibility, and gives the results on hot tearing for various aluminium alloys. During the test, the effect of alloy chemical composition on hot tearing susceptibility was also analyzed. Two different Al-based alloys were examined. Conclusions deals with effect of strontium on hot tearing susceptibility and confirms that main objective was achieved.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1837-1842
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing and Characterization of Fe-Cu-Ni Sinters Prepared by Ball Milling and Hot Pressing
Autorzy:
Borowiecka-Jamrozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/354394.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
matrix
diamond
hot pressing
diamond tools
Opis:
The main objective of the present work was to determine the effect of powder composition on microstructure and properties of iron-base materials used as matrices in diamond impregnated tools. The Fe-Cu-Ni powders premixed and ball-milled for 30 hours, were used for the experiments. The influence of manufacturing process parameters on microstructure and mechanical properties of produced sinters was investigated. Sintering was done by hot-pressing technique in graphite mould. The powders were consolidated to a virtually pore-free condition during 3 minutes hold at 35 MPa and 900°C. Investigations of the sintered materials included: density, hardness, static tensile test and X-ray diffraction (XRD) analysis. Microstructural and fractographic observations were also made with a scanning electron microscope (SEM). The obtained results indicate that the sintered parts have a high density, close to the theoretical value, good plasticity, relatively high hardness and yield strength, and are characterized by a coarse-grained microstructure.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1157-1161
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis and modelling of newly developed and unconventional processes of plastic forming of toothed gear elements
Autorzy:
Michalczyk, J.
Wiewiórowska, S.
Muskalski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/352513.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
forging
gears
FEM analysis
hot extrusion
Opis:
The article reports the results of a comparative analysis made for three novel unconventional gear wheel forging processes based on the authors’ patented [5,6,21] plastic forming methods developed chiefly for the purposes of extruding hollow products as well as valves and pins. These processes are distinguished by the fact that part of the tooling elements which are normally fixed during conventional forging are purposefully set in motion. This is intended to change the conditions of friction at the metal-tool contact surface and to induce additional thermal effects due to the transformation of the plastic deformation energy into thermal energy and, as a consequence, to improve the plastic flow of metal and to reduce the force parameters of the process.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 87-94
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LMO Ceramics Microstructure
Autorzy:
Bruś, B.
Zarycka, A.
Powiązania:
https://bibliotekanauki.pl/articles/350959.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LMO
microstructure
hot pressing
free sintering
Opis:
The aim of this work was to characterize the microstructure of LMO type ceramics. The ceramics obtained by the free sintering at two temperatures 1473 K and 1573 K and two sintering times 6 and 12 h was the test material. One series was also obtained by the hot pressing method for a comparison. In all the cases the material synthesis was conducted by the solid-state reaction method at 1173 for 24 h. Photographs of the specimen fractures were taken by a scanning electron microscope to characterize the microstructure of the ceramics obtained in a more detailed way. The VISILOG 4 system, enabling to calculate a lot of parameters characterizing the material microstructure, such as e.g.: a number of grains on the unit area, an average grain size, shape indexes of the grains in question, was used as well. It allows determining a grain size distribution, and a frequency of presence of grains with the specific shape index. By analyzing a set of the parameters obtained an influence of the technological conditions on the microstructure of the material in question, and on its properties and applicability at the same time can be determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 857-862
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of “Hot” Drawing Process of Trip Steel Wires at Different Initial Temperatures
Autorzy:
Wiewiórowska, S.
Muskalski, Z.
Siemiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/354578.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TRIP steel
“hot” drawing process
wires
Opis:
In the work the results of preliminary research of the „hot” drawing process of TRIP steel wires at different initial temperatures has been shown. The study is expected to find whether the „hot” drawing process, and so the increase in the temperature of the material being drawn, will block the transformation of retained austenite into martensite and, as a consequence, influence the properties of drawn wire.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1991-1994
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of Deformation and Forecasting Microstructure in the Forging Process of the X6CrNiTi18-10 Austenitic Steel
Autorzy:
Kukuryk, M.
Powiązania:
https://bibliotekanauki.pl/articles/352789.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot forging
austenitic steel
FEM
microstructure
Opis:
The paper presents the analysis of the three-dimensional strain state for the cogging process of a forging (type: shaft) of the X6CrNiTi18-10 austenitic steel with the application of the finite element method. The results of the thermal-mechanical simulation of the hot cogging process on flat and shaped anvils, taking under consideration boundary conditions applied in industrial practice, are presented. In the research, a new method of forging, consisting in the introduction of the initial forging of the stock on anvils which have convex work surfaces, and further forging on shaped anvils, was applied. The results of the calculations make it possible to determine effective strain distribution, effective stress, mean stresses and temperature in the volume of a forging. The solution was supplemented by the addition of the model of microstructure development in the course of deformation. The conducted research constitutes the basis for determining the best possible technological process of the initial forging of a cast ingot, and provide the possibility of forecasting the deformations and parameters of the microstructure.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 393-401
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative Evaluation of Porosity in Turbine Blades Made of IN713C Superalloy After Hot Isostatic Pressing
Autorzy:
Roskosz, S.
Powiązania:
https://bibliotekanauki.pl/articles/355974.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
superalloys
turbine blades
hot isostatic pressing
porosity
Opis:
The aim of this paper is an assessment of the influence of hot isostatic pressing treatment on porosity of cast samples - turbine blades and vane clusters made of the IN713C superalloy. Two variants of HIP treatments, differing in pressure from each other, have been used. The quantitative evaluation of the porosity was performed using light microscopy and quantitative metallography methods. The use of the hot isostatic pressing significantly decreased the volume fraction and size of pores in the test blades, the remaining pores after the HIP process being characterized by a round shape. The increased pressure has caused significant reductions in the area fraction and size of the pores.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 253-258
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of Hot-Deformed Cu-3Ti Alloy
Autorzy:
Szkliniarz, A.
Szkliniarz, W.
Blacha, L.
Siwiec, G.
Powiązania:
https://bibliotekanauki.pl/articles/352283.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper-titanium alloy
hot deformation
microstructure
recrystallization
Opis:
In the paper, results of investigations regarding temperature and strain rate effects on hot-deformed Cu-3Ti alloy microstructure are presented. Evaluation of the alloy microstructure was performed with the use of a Gleeble HDS-V40 thermal-mechanical simulator on samples subjected to uniaxial hot compression within 700 to 900ºC and at the strain rate of 0.1, 1.0 or 10.0 s-1 until 70% (1.2) strain. It was found that within the analyzed temperature and strain rate ranges, the alloy deformation led to partial or complete recrystallization of its structure and to multiple refinement of the initial grains. The recrystallization level and the average diameter of recrystallized grains increase with growing temperature and strain rate. It was shown that entirely recrystallized, fine-grained alloy structure could be obtained following deformation at the strain rate of min 10.0 s-1 and the temperature of 800°C or higher.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 347-352
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Constrained Rod Casting Mold for New Hot Tearing Measurement
Autorzy:
Malau, V.
Akhyar, H.
Iswanto, P. T.
Powiązania:
https://bibliotekanauki.pl/articles/355427.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot tearing
CRCM-Horizontal
HTS formula
casting
Opis:
Hot tearing severity was evaluated in this experiment by introducing a new apparatus called Constrained Rod Casting Modified Horizontal (CRCM-Horizontal). Six constraint bars with different lengths can produce hot tearing on the cast sample. Mold position was modified from vertical to horizontal and the shape was changed from a harp shape to a star shape, which allows for the liquid metal to feed into each rod cavity simultaneously. Hot tearing development was recorded along the bars by a digital camera. A new Hot Tearing Susceptibility ( HTS) formula was developed for quantitative investigation of hot tearing on a cast sample. The parameters of the HTS formula are bar length of cast sample (Li), tear severity (Ci) and location of hot tear (Pi). Footprint charts and hot tear scales are used to illustrate hot tearing severity. The experiment was conducted with Al-1.36Zn-1.19Si and Al-5.9Cu-1.9Mg alloys to investigate the sensibility of the apparatus and modification its operation.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1201-1208
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes In Properties of Hot-Dip Zinc Coating Resulting from Heat Treatment
Autorzy:
Jędrzejczyk, D.
Szatkowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/351543.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot-dip zinc galvanizing
heat treatment
coating hardness
Opis:
This paper analyses the heat treatment of the hot-dip zinc coating deposited on both cast iron and steel. The aim of research is to increase coating hardness and wear resistance without decreasing its anticorrosion properties. Hot-dip zinc coating was deposited in industrial conditions (acc. PN-EN ISO 10684) on disc shape samples and bolts M12x60. The achieved results were assessed on the basis of microscopic observation (with the use of an optical and scanning microscope), EDS (point and linear) analysis and micro-hardness measurements. It was discovered that the heat treatment of zinc coating results in an increase in hardness which is caused by the corresponding changes in microstructure.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 201-206
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and Modelling of a Novel Process of Manufacturing Cylindrical Products with a Variable Longitudinal-Section Stub Pipe
Autorzy:
Michalczyk, J.
Wiewiórowska, S.
Muskalski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/354824.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cylinder extrusion
FEM analysis
bronze extrusion
hot extrusion
Opis:
The publication presents a novel concept of the process of plastic forming of variable longitudinal-section cylindrical products, being the subject of Patent Application P.427426 [1]. Additionally, these products are provided with a connection stub pipe. The plastic forming method proposed in the article combines many advantages and utilitarian benefits associated with the manufacturing technology itself, as well as with its further implementation. Using stock in the form of normalized bar commonly available in the metal product market as a finished product obviously reduces the process costs involved with stock preparation, i.e. casting, rolling, machining, etc. It also results in obtaining a much smaller surface area of stock contact with the tool and, as a consequence, a smaller surface of stock friction against the tool, which contributes to a reduction of force needed for the plastic forming of the product. The smaller contact surface area and the shorter time of stock contact with the cooler tool cause, above all, less intensive heat exchange and stock chilling. This has a significant effect on the plasticity of the cast material and, as a consequence, the plastic forming force. The proposed method enables also manufacturing cylinders with either a closed or open stub pipe with a regulatedlength and a varying section. In addition, unlike the method known from Polish Patent Specification PL 212062 [2], the proposedmethod does not require using a multi-tool press. The upper punch is furnished with a flange, whose job is to start the stock extrud-ing sleeve at the next process stage.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1187-1193
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 110

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