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Tytuł:
Artificial Neural Network to the Control of the Parameters of the Heat Treatment Process of Casting
Autorzy:
Wróbel, J.
Kulawik, A.
Bokota, A.
Powiązania:
https://bibliotekanauki.pl/articles/382692.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
moving heat source
artificial neural network
numerical modelling
control system
heating process
obróbka cieplna
źródło ciepła ruchome
sztuczna sieć neuronowa
modelowanie numeryczne
system sterowania
proces nagrzewania
Opis:
In the paper the use of the artificial neural network to the control of the work of heat treating equipment for the long axisymmetric steel elements with variable diameters is presented. It is assumed that the velocity of the heat source is modified in the process and is in real time updated according to the current diameter. The measurement of the diameter is performed at a constant distance from the heat source (Δz = 0). The main task of the model is control the assumed values of temperature at constant parameters of the heat source such as radius and power. Therefore the parameter of the process controlled by the artificial neural network is the velocity of the heat source. The input data of the network are the values of temperature and the radius of the heated element. The learning, testing and validation sets were determined by using the equation of steady heat transfer process with a convective term. To verify the possibilities of the presented algorithm, based on the solve of the unsteady heat conduction with finite element method, a numerical simulation is performed. The calculations confirm the effectiveness of use of the presented solution, in order to obtain for example the constant depth of the heat affected zone for the geometrically variable hardened axisymmetric objects.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 119-124
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rapid determination of lactic acid in anaerobic biological treatment process using a portable sensitive lactate biosensor
Autorzy:
Darwin, D.
Powiązania:
https://bibliotekanauki.pl/articles/80265.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rapid determination
lactic acid
lactate concentration
lactate biosensor
anaerobic digestion
acidification
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Properties of Surface Layer of Carburized 38CrAlMo6-10 Steel Subjected to Nanostructurization by a Heat Treatment Process
Struktura i właściwości warstwy nawęglanej na stali 38CrAlMo6-10 po procesie nanostrukturyzacji w warunkach obróbki cieplnej
Autorzy:
Wasiluk, K.
Skołek, E.
Świątnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/352483.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carburization
austempering
low-temperature bainite
nanobainite
nawęglanie
hartowanie
bainit niskotemperaturowy
nanobainit
Opis:
The aim of the study was to produce and characterize a nanobainitic microstructure in surface layers of carburized 38CrAlMo6-10 structural steel. Steel contained 1.% Al and 0.3% Si - elements hindering the cementite precipitation, which was considered to be adequate for obtaining a carbide free bainite. Steel samples were subjected to two different vacuum carburizing processes in order to obtain two different contents of carbon in surface layer. To produce a nanobainitic microstructure a heat treatment consisting of austempering at temperature slightly higher than the martensite start temperature (Ms) of the layer was applied after each carburization process. It was found, that the obtained microstructure of carburized layer depends strongly on carbon content. In steel with surface layer containing lower carbon content a nanobainitic microstructure with carbon-enriched residual austenite was formed. In case of surface layer containing higher carbon content the ultra-fine grained lower bainite was obtained.
Celem pracy było wytworzenie w nawęglonej warstwie wierzchniej stali 38CrAlMo6-10 mikrostruktury nanobainitu. Stal ta zawiera dodatek 1,31% Al+Si - pierwiastków hamujących wydzielanie węglików, który został uznany za wystarczający by umożliwić powstanie nanobainitu. Próbki poddano dwóm procesom nawęglania do dwóch różnych zawartości węgla w warstwie wierzchniej. Zastosowana obróbka cieplna nanobainityzacji obejmowała hartowanie izotermiczne w temperaturach nieco wyższych niż Ms warstwy. Uzyskane wyniki pozwalają stwierdzić, że mikrostruktura warstwy wierzchniej po bainityzacji zależy silnie od zawartości węgla. W przypadku jednej warstwy uzyskano nanometrycznej wielkości listwy bainitu z filmem wzbogaconego w węgiel austenitu resztkowego, w drugiej mikrostrukturę ultra drobnoziarnistego bainitu dolnego.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1685-1690
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Process Treatment on the Amount and Grain Structure of After Reclamation Dusts
Autorzy:
Skrzyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/946867.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spent moulding sand
vibratory reclamation
dusts
environment protection
zużyte masy formierskie
regeneracja wibracyjna
pyły
ochrona środowiska
Opis:
The analysis of after reclamation dusts generated during the reclamation treatment of test portions of two kinds of polydispersive material in the Regmas device, is presented in the hereby paper. For the comparative purpose the fresh moulding sand marked as quartz sand „Sibelco” –1K 0.40/0.32/0.20, J88, >14000C, WK = 1.20 (acc. PN-83/H-11077), as well as the spent moulding sand, which was previously subjected to the primary reclamation and to dedusting, were used. Conditions of the process treatment were forced by the frequency of supplying the vibratory drive motors being successively 40, 50 and 60Hz for 5, 10 and 15 min. and by causing a diversified material flow through the functional system of the device (charging hopper, abrasive chamber acting as a buffer space). Two states of the process treatment, when a material was flowing through the chamber, were applied. In the first one, an intergranular surface abrasion of grains occurred as a result of the granular material circulation in the chamber forced by the vibratory drive. In the second one, the forced material flow was performed in the presence of crushing elements (steel balls), additionally introduced into the abrasive chamber. Analyses of the device influence were performed by determinations of the amount of dusts separated in the pneumatic classifier and analysis of their grain sizes by means of Analysette 22NanoTec.
Źródło:
Archives of Foundry Engineering; 2020, 20, 2; 71-78
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Azo dye wastewater treatment in a novel process of biofilm coupled with electrolysis
Autorzy:
Zou, Haiming
Chu, Lin
Wang, Yang
Powiązania:
https://bibliotekanauki.pl/articles/204706.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
azo dye wastewater treatment
color removal
biofilm
electrolysis
bioelectrochemical system
Opis:
Azo dye wastewater treatment is urgent necessary nowadays. Electrochemical technologies commonly enable more efficient degradation of recalcitrant organic contaminants than biological methods, but those rely greatly on the energy consumption. A novel process of biofilm coupled with electrolysis, i.e., bioelectrochemical system (BES), for methyl orange (MO) dye wastewater treatment was proposed and optimization of main influence factors was performed in this study. The results showed that BES had a positive effect on enhancement of color removal of MO wastewater and 81.9% of color removal efficiency was achieved at the optimum process parameters: applied voltage of 2.0 V, initial MO concentration of 20 mg/L, glucose loads of 0.5 g/L and pH of 8.0 when the hydraulic retention time (HRT) was maintained at 3 d, displaying an excellent color removal performance. Importantly, a wide range of effective pH, ranging from 6 to 9, was found, thus greatly favoring the practical application of BES described here. The absence of a peak at 463 nm showed that the azo bond of MO was almost completely cleaved after degradation in BES. From these results, the proposed method of biodegradation combined with electrochemical technique can be an effective technology for dye wastewater treatment and may hopefully be also applied for treatment of other recalcitrant compounds in water and wastewater
Źródło:
Archives of Environmental Protection; 2019, 45, 3; 38-43
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between general and specifi c self-effi cacy during the decision-making process considering treatment
Autorzy:
Życińska, Jolanta
Kuciej, Alicja
Syska-Sumińska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/430241.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Social Cognitive Theory (SCT)
general and task-specific self-efficacy
intention
planning
mediation
Opis:
The aim of the study was to confi rm the mediation effects of the task-specifi c self-effi cacy on the relationship between the general self-effi cacy and intention and planning considering treatment. The study comprised 265 subjects, of which 165 were post-mastectomy women and 100 patients hospitalized due to acute coronary syndrome (ACS). The variables were assessed using the Generalized Self-Effi cacy Scale (GSES) and tools developed to examine the context of treatment. The data were analyzed using the bootstrapping procedure. The results confi rmed the indirect effects of task-specifi c self-effi cacy, both in women making a decision to undergo breast reconstruction, and in patients after ACS formulating intention to change risk behaviours. As smoking was considered to be a moderator in the post-ACS group, the obtained associations were observed only among the patients declaring quitting smoking. In view of the fact that taskspecifi c self-effi cacy is susceptible to context (e.g. it may depend on quitting smoking), it is useful to assess it in order to increase treatment effectiveness.
Źródło:
Polish Psychological Bulletin; 2012, 43, 4; 278-287
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Heat Treatment on the Magnetization Process (within Strong Magnetic Fields) for the Alloy: Fe61Co10Y8Cu1B20
Autorzy:
Gruszka, K.
Nabiałek, M.
Błoch, K.
Powiązania:
https://bibliotekanauki.pl/articles/353778.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk amorphous
Kronmüller method
XRD
structural defects
Opis:
Samples of Fe61Co10Y8Cu1B20 alloy were investigated in the ‘approach to ferromagnetic saturation’ region by using the Kronmüller method. The amorphous material was obtained by radially cooling the molten alloy under a protective atmosphere of inert gas. Following this manufacturing process, static magnetic hysteresis loops were measured for samples, before and after a controlled isothermal annealing process, using a LakeShore vibrating magnetometer (VSM). From analysis of the primary magnetization curves, the distribution of structural defects and the average exchange distance for these defects were determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 499-502
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat Treated AZ61 Magnesium Alloy Obtained by Direct Extrusion and Continuous Rotary Extrusion Process
Autorzy:
Bigaj, M.
Boczkal, S.
Żelechowski, J.
Gawlik, M.
Mitka, M.
Powiązania:
https://bibliotekanauki.pl/articles/351751.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AZ61
heat treatment
Mg17Al12
continuous rotary extrusion process
direct extrusion
Opis:
The results of studies carried out on the heat treated AZ61 magnesium alloy extruded by two methods, i.e. direct extrusion and continuous rotary extrusion, were presented. As part of the work, parameters of the T6 heat treatment were proposed and aging curves were plotted. The solution heat treatment process was accompanied by the grain growth. During artificial aging, due to the decomposition of solid solution, the β-Mg17Al12 phase was precipitated from the supersaturated α solution. It precipitated in a coagulated form at the grain boundaries and in the form of fine-dispersed plates arranged in a preferred direction relative to the grain orientation. Rods obtained by continuous rotary extrusion, unlike those made by the direct process, exhibited a low degree of texturing and lack of anisotropic properties.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 405-410
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on the process of heat treatment of conductive AlZr alloys obtained in various productive processes
Badania nad procesem obróbki cieplnej przewodowych stopów ALZr uzyskanych w różnych procesach produkcyjnych
Autorzy:
Knych, T.
Piwowarska, M.
Uliasz, P.
Powiązania:
https://bibliotekanauki.pl/articles/351422.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stopy aluminium
AlZr
materiały przewodzące
obróbka cieplna
przewodnodność elektryczna
aluminium alloys
heat treatment
electric conductivity
Opis:
A novelty in electroenergetics of the recent years are anti-blackout conductors of the HTLS type. These conductors allow for an above average increase of the transmission capacity of electric energy through overhead lines. The high temperature work of such conductor is possible with the use of thermally resistant aluminium alloys with the addition of zirconium. Compared to the traditionally applied material of the EN AW 1370 class, those alloys' permissible work temperature is at the level of 150 to 230°C (aluminium 80°C). The production technology for the alloys of this type includes a line of continuous casting and rolling of the wire rod, and next, its long-term heat treatment. The aim of the process of the heating of the wire rod is obtaining the desired level of the material's properties, which will make it possible to obtain the final properties of the wires assigned for the creation of conductors. The paper presents the results of the studies aiming at the description of the influence of the heat treatment of the material obtained in various production process conditions on its mechanical and electric properties.
Nowością ostatnich lat w elektroenergetyce są antyblackoutowe przewody typu HTLS. Przewody te umożliwiają ponadprzeciętne zwiększenie zdolności przesyłu energii elektrycznej liniami napowietrznymi. Wysokotemperaturowa praca takiego przewodu, możliwa jest poprzez wykorzystanie odpornych cieplnie stopów aluminium z dodatkiem cyrkonu. Stopy te w porównaniu z tradycyjnie stosowanym materiałem w gatunku EN AW 1370 posiadają dopuszczalną temperaturę pracy na poziomie 150 do 230°C (aluminium 80°C). Technologia produkcji tego typu materiałów obejmuje linię ciągłego odlewania i walcowania walcówki, a następnie jej długoczasową obróbkę cieplną. Celem procesu wygrzewania walcówki jest osiągnięcie wymaganego poziomu własności materiału, który umożliwi uzyskanie końcowych własności drutów, przeznaczonych do budowy przewodów. W pracy przedstawiono wyniki badań zmierzających do określenia wpływu parametrów obróbki cieplnej materiału uzyskanego w rożnych warunkach procesu produkcyjnego na jego własności mechaniczne i elektryczne.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 3; 685-692
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of catalytic processes for biodiesel production wastewater treatment
Autorzy:
Borralho, Teresa
Coelho, Solange
Estrelo, Andreia
Powiązania:
https://bibliotekanauki.pl/articles/205024.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cobalt
chemical oxygen demand
Fenton process
biodiesel production wastewater
catalytic advanced oxidation process
potassium monopersulphate
Opis:
The study of the possibility of removing organic compounds from wastewater originating from the biodiesel purification stage by two catalytic processes, HSO5-/transition metal and Fenton method has been presented. The source of the ion HSO5-is potassium monopersulphate (2KHSO5∙KHSO4∙K5SO4) (Oxone) that may be decomposed into radicals (OH., SO4-., SO5-.) by means of transition metal as Co(II). Different concentrations were used for both compounds and the combination ([Co2+] = 1.00μM/[HSO5-] = 5.00·10-2 M) achieved the highest COD removal (60%) and complete decomposition of the oxidant was verified for contact times of 45 min. This process has some advantages comparing to the conventional Fenton method such as the absence of the costly pH adjustment and the Fe(III) hydroxide sludge which characterize this treatment process. The Fenton process showed that the combination of [H2O2] = 2.00M/[Fe2+] = 0.70 M was the best and archived COD removal of 80%. The treatments studied in this research have achieved high COD removal, but the wastewater from the biodiesel purification stage presents very high parametric values of Chemical Oxygen Demand (667,000 mgO2/L), so the final COD concentration reached is still above the emission limit of discharge in surface water, according the Portuguese Law (Decree-Law 236/98). However, both treatments have proved to be feasible techniques for the pre-oxidation of the wastewater under study and can be considered as a suitable pre-treatment for this type of wastewaters. A rough economic analysis of both processes was, also, made.
Źródło:
Archives of Environmental Protection; 2019, 45, 2; 66-72
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat Treatment of the SiMo Iron Castings - Case Study in the Automotive Foundry
Autorzy:
Cygan, B.
Stawarz, M.
Jezierski, J.
Powiązania:
https://bibliotekanauki.pl/articles/379738.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
solidification process
SiMo cast iron
exhaust manifold
automotive parts
obróbka termiczna
proces krzepnięcia
żeliwo SiMo
kolektor wydechowy
części samochodowe
Opis:
Silicon – molybdenum cast iron commonly called SiMo due to its unique properties has becoming more and more interesting engineering material. The history and development of this alloy is relatively long but, due to the significant difficulties during the manufacturing process resulting in the lower final quality than expected, it has not been applied to often in practice. The biggest challenge is its brittleness as a result of the carbides precipitations. During last few years, thanks to the many important researches made and the general foundry technology development, the interest in SiMo iron has been rapidly growing, especially for the castings for heavy duty applications like corrosion, high temperature and wear abrasion resistant parts. In the article the heat treatment attempts to improve the microstructure of SiMo castings has been presented. The goal was to destroy or at least to refine and uniformly distribute the carbides precipitations to improve mechanical properties of the exhaust manifold castings for the cars. The experiments were carried out for the alloy contains approx. 4% Si, 1% Mo and 3.2%C. The range of the research included: hardness measuring, standard mechanical properties and microstructure for as-cast state and after that the subsequent heat treatment process with another properties check. The result of the heat treatment was the elimination of pearlite from the metal matrix. Moreover, the changes of the carbide molybdenum – rich phase morphology were observed. The dispersion of the carbides precipitations in the carbides area was observed. The experiments proved the possibility to control the microstructure and the mechanical properties of the SiMo castings by means of heat treatment but only to some extent.
Źródło:
Archives of Foundry Engineering; 2018, 18, 4; 103-109
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Atmospheric-Pressure Gas-Plasma Treatment on Surface Properties of Hot-Dip Zn-Mg-Al Alloy-Coated Steel
Autorzy:
Jeong, Chang-U
Kim, Jae-Hyeon
Park, Je-Shin
Kim, Min-Su
Kim, Sung-Jin
Oh, Min-Suk
Powiązania:
https://bibliotekanauki.pl/articles/2203736.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plasma treatment
Zn-Mg-Al-galvanized steel
surface energy
process gas
Opis:
The effect of plasma-radical change on the surface properties of Zn-Mg-Al ternary-alloy-coated steel sheets during atmospheric-pressure (AP) plasma treatment using different process gases: O2, N2, and compressed air was investigated. The plasma-induced radicals promoted the formation of chemical particles on the surface of the Zn-Mg-Al coating, thereby increasing the surface roughness. The surface energy was calculated using the Owen-Wendt geometric equation. Contact angle measurements indicated that the surface free energy of the alloy sheets increased upon AP plasma treatment. The surface properties of the Zn-Mg-Al coating changed more significantly in the order air > O2 > N2 gas, indicating that the plasma radicals facilitated the carbonization and hydroxylation of the Mg and Al components during the AP plasma treatment.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 187--190
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of the welding phenomenon in forward aluminium extrusion process
Autorzy:
Piwnik, J.
Kuprianowicz, J.
Mogielnicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/379472.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plastic treatment
extrusion process
welding
tool design
obróbka plastyczna
proces wyciskania
spawanie
projektowanie narzędzi
Opis:
There is often need to use welding methods in the aluminium alloys extrusion processes. Welding methods while extruding are divided in to transverse and longitudinal one. In paper the energy criterions for transverse and longitudinal joining during extrusion of aluminium alloys in warm conditions are showed. Numerical simulation results for two cylindrical billets transverse joining, during forward extruding with using the flat punch are presented. Irregularity in the billets material flow and presence of a void are proved. In order to equalization the flowing billets volumes streams, the numerical model for forward extrusion of cylindrical billets, with using the punch with a toe and initially formed upper billet is proposed. The application of this method causes both transverse and longitudinal welding schemes appearing. Combination of two welding schemas gives the product, which has a core made of material from the upper billet and external layers of the lower billet.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 191-194
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Austempered Ductile Iron Manufacturing Data Acquisition Process with the Use of Semantic Techniques
Autorzy:
Wilk-Kołodziejczyk, D.
Kluska-Nawarecka, A. S.
Regulski, K.
Adrian, W.
Jaśkowiec, K.
Powiązania:
https://bibliotekanauki.pl/articles/355169.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austempered ductile iron
thermal treatment
properties
process data
data integration
ontology
Opis:
The aim of this work was to propose a methodology supporting the task of collecting the comparative data on studies of the mechanical properties of ADI. Collecting of research data is an important step in the process of finding the optimum design solutions for newly made products - experimental data allow us properly calibrate the manufacturing process of ADI to let the final product achieve the required properties. Parameters of the ADI production process, i.e. the time and temperature of austenitising and austempering, as well as the alloying elements added to ductile iron affect the ADI properties. The design process can use research data collected, among others, from the Web. As stated in the article, the process of data acquisition can be supported by semantic technologies, including ontologies which are descriptive logic formalism.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2117-2122
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acetylene Flow Rate as a Crucial Parameter of Vacuum Carburizing Process of Modern Tool Steels
Autorzy:
Rokicki, P.
Dychton, K.
Powiązania:
https://bibliotekanauki.pl/articles/354322.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vacuum carburizing
heavily-loaded gears
thermo-chemical treatment
microstructure
Opis:
Carburizing is one of the most popular and wide used thermo-chemical treatment methods of surface modification of tool steels. It is a process based on carbon diffusive enrichment of the surface material and is applied for elements that are supposed to present higher hardness and wear resistance sustaining core ductility. Typical elements submitted to carburizing process are gears, shafts, pins and bearing elements. In the last years, more and more popular, especially in highly advanced treatment procedures used in the aerospace industry is vacuum carburizing. It is a process based on chemical treatment of the surface in lower pressure, providing much higher uniformity of carburized layer, lower process cost and much lesser negative impact on environment to compare with conventional carburizing methods, as for example gas carburizing in Endo atmosphere. Unfortunately, aerospace industry requires much more detailed description of the phenomena linked to this process method and the literature background shows lack of tests that could confirm fulfilment of all needed requirements and to understand the process itself in much deeper meaning. In the presented paper, authors focused their research on acetylene flow impact on carburized layer characteristic. This is one of the most crucial parameters concerning homogeneity and uniformity of carburized layer properties. That is why, specific process methodology have been planned based on different acetylene flow values, and the surface layer of the steel gears have been investigated in meaning to impact on any possible change in potential properties of the final product.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2009-2012
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 41

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