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1
Content available Microstructural and Tribological Characterization of Aluminium Bronzes with Additions of Si and Cr
Pisarek B. P., Kowalski B., Atapek H., Polat Ş., Tüfekçi T.
Archives of Foundry Engineering
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2018
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Vol. 18, iss. 1
93--98
EN
The article presents the investigation results of the crystallization (performed by means of the TDA method) and the microstructure of complex aluminium bronzes with the content of 6% Al, 4% Fe and 4% Ni, as well as Si additions in the scope of 1–2% and Cr additions in the scope of 0.1–0.3%, which have not been simultaneously applied before. For the examined bronze, the following tests were performed: hardness HB, impact strength (KU2). For bronze CuAl6Fe4Ni4Si2Cr0.3, characterizing in the highest hardness, wear tests were conducted with dry friction and the dry friction coefficient. The investigations carried out by means of the X-ray phase analysis demonstrated the following phases in the microstructure of this bronze: αCu, γ2 and complex intermetallic phases based on iron silicide type Fe3Si (M3Si M={Fe,Cr,…}). Compared to the normalized aluminium bronzes (μ=0.18–0.23), the examined bronze characterizes in relatively low wear and lower friction coefficient during dry friction (μ=0.147±0.016).
2
Content available Analysis of AM60 and AZ91 Alloy Crystallisation in Ceramic Moulds by Thermal Derivative Analysis (TDA)
Rapiejko C., Pisarek B., Czekaj E., Pacyniak T.
Archives of Metallurgy and Materials
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2014
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Vol. 59, iss. 4
1449--1455
EN
The work presents the test results of the crystallisation and cooling of magnesium alloys: AM60 and AZ91, with the use of the TDA method. The tested alloys were cast into ceramic shells heated up to 180°C, produced according to the technology of the shell production in the investment casting method. The TDA method was applied to record and characterize the thermal effect resulting from the phase transformations occurring during the crystallisation of magnesium alloys. The kinetics and dynamics of the thermal processes of the crystallisation of AM60 and AZ91 in the ceramic shells were determined. Metallographic tests were performed with the use of an optical microscope as well as scanning microscopy, together with the EDS chemical analysis of the phases present in the tested casts. A comparison of these test results with the thermal effect recorded by way of the TDA method was made.
PL
W pracy przedstawiono wyniki badań krystalizacji i stygnięcia stopów magnezu: AM60 i AZ91 przy użyciu metody ATD. Badane stopy zalewano do form ceramicznych podgrzanych do temperatury 180°C, wykonanych zgodnie z technologią wytwarzania form w metodzie traconych modeli. Przy pomocy metody ATD zarejestrowano i wyznaczono charakterystyczne efekty cieplne wynikające z przemian fazowych zachodzących podczas krystalizacji badanych stopów magnezu. Określono kinetykę i dynamikę procesów cieplnych krystalizacji stopów AM60 i AZ91 w formach ceramicznych. Przeprowadzono badania metalograficzne przy pomocy mikroskopu optycznego oraz mikroskopii skaningowej wraz z analizą chemiczną EDS występujących faz w badanych odlewach. Porównano wyniki tych badań z efektami cieplnymi zarejestrowanymi metodą ATD.
3
Content available Technological aspects of low-alloyed cast steel massive casting manufacturing
Szajnar J., Studnicki A., Głownia J., Kondracki M., Suchoń J., Wróbel T.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 4
97--102
EN
In the paper authors have undertaken the attempt of explaining the causes of cracks net occurrence on a massive 3-ton cast steel casting with complex geometry. Material used for casting manufacturing was the low-alloyed cast steel with increased wear resistance modified with vanadium and titanium. The studies included the primary and secondary crystallization analysis with use of TDA and the qualitative and quantitative analysis of non-metallic inclusions.
4
Content available Crystallization of low-alloyed construction cast steel modified with V and Ti
Studnicki A., Kondracki M., Szajnar J., Wróbel T.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 3
92--96
EN
In this paper crystallization studies of low-alloyed construction cast steel were presented for different additions of chromium, nickel and molybdenum modified with vanadium and titanium. Studies were conducted using developed TDA stand, which additionally enabled evaluation of cooling rate influence on crystallization process of investigated alloys.
5
Content available remote Bainite obtaining in cast iron with carbides castings
Pietrowski S., Gumienny G.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1
109-114
EN
In these paper the possibility of upper and lower bainite obtaining in cast iron with carbides castings are presented. Conditions, when in cast iron with carbides castings during continuous free air cooling austenite transformation to upper bainite or its mixture with lower bainte proceeds, have been given. A mechanism of this transformation has been given, Si, Ni, Mn and Mo distribution in the eutectic cell has been tested and hardness of tested castings has been determined.
6
Content available remote Plaster mould casting process of AlSi11 alloy
Władysiak R., Pawlak M.
Archives of Foundry Engineering
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2009
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Vol. 9, iss. 4
225-232
EN
The paper presents the results of the crystallization and cooling process of AlSi11 silumin in the plaster mould with TDA method and describes the impact of the preparation of plaster mould and liquid silumin on received microstructure and quality of casting. The effect of the pouring temperature of silumin on porosity and filling of mould cavity was investigated. The nature and rate of change of temperature in casting and the formation of the microstructure was shown by means thermal and derivative curves. Through the use of control samples in range of a thickness of 0.5 - 4 mm confirmed the possibility of obtaining thin-walled silumin castings in pre-heated before plaster moulds. It has been proved that changing the parameters of pre-treatment moulds of gypsum, the pouring temperature and modification of silumin you can control the crystallization process, obtained microstructure and properties Rm, RP02 and HB.
7
Content available remote Bainitic nodular cast iron with carbides obtaining with use of Inmold method
Gumienny G.
Archives of Foundry Engineering
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2009
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Vol. 9, iss. 3
243-248
EN
In these paper bainitic nodular cast iron with carbides as-cast obtaining has been presented. This cast iron has been obtained with use of Inmold method. It was shown, that there is the possibility of bainite and carbides obtaining in cast iron with Mo and Ni for studied chemical composition.
8
Content available remote Crystallization of nodular cast iron with carbides
Pietrowski S., Gumienny G.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 4
236-240
EN
In this paper a crystallization process of nodular cast iron with carbides having a different chemical composition have been presented. It have been found, that an increase of molybdenum above 0,30% causes the ledeburutic carbides crystallization after ([alpha]+ graphite) eutectic phase crystallization. When Mo content is lower, these carbides crystallize as a pre-eutectic phase. In this article causes of this effect have been given.
9
Content available remote The crystallisation of the aluminium bronze with additions of Si, Cr, Mo and/or W
Pisarek B. P.
Archives of Materials Science and Engineering
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2007
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Vol. 28, nr 8
461-466
EN
Purpose: The aim of this paper is description of the process of the crystallization of new aluminium bronzes with the complex silicides of the iron. Design/methodology/approach: Additions Cr, W, Mo and Si were introduced to create in the microstructure of the aluminium bronze of the complex silicides of the iron about high mechanical and physical proprieties to the bronze BA1044. The process of formation the microstructure of the bronze with use of the method of the thermal and derivative analysis (TDA) was analysed. The examinations under the microscope and X-ray microanalysis of the surface distribution of elements were conducted. Findings: From carried research results, that in the aluminium bronze BA1044 after addition Si, Cr, Mo and/or W the phase κ Fe, κ Ni crystallize as the complex silicides of the iron. Elements such as: Fe and Si dissolve first of all in silicides in the smaller stage in the matrix of the bronze, Mn and Ni they dissolve in matrix and silicides, Cr dissolves in the larger stage in silicides than in the matrix, W and Mo dissolve in silicides however they crystallize as nanocrystals in the metal matrix and create with her composite. Research limitations/implications: Results of investigations of aluminium bronze BA1044 and alloys after adding to him about 1% Si were introduced in the article and suitably: 1.22 % C; 0.82 % Mo; 0.020 % W; 0.60 % Cr, 0.17 % Mo and 0.017 % W. Originality/value: The original results of the investigations of the crystallization of the new bronzes (innovative materials and casting technologies) for which the process of arising microstructure the method TDA was not analysed so far were introduced in the article. The article possesses cognitive values not only essential for researcher but and practician-melters.
10
Content available remote System komputerowy kontroli i sterowania jakością siluminów przeznaczonych na koła samochodowe
Pietrowski S., Pisarek B., Władysiak R.
Archiwum Odlewnictwa
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2003
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R. 3, nr 10
112--125
PL
W pracy przedstawiono autorski System Komputerowy Kontroli i Sterowania Jakością Siluminów (j. ang. CAQCSS - Computer Aided Quality Control of Silumins System) przeznaczonych na koła samochodowe - felgi. W programie sterującym systemu wykorzystano metodę ATD. W pracy podano charakterystyczne wielkości wyznaczane tą metodą, stanowiące podstawę opracowanych zależności statystycznych oraz przedstawiono istotę komunikacji systemu z operatorem w zależności od zawartości wodoru w ciekłym siluminie. System wdrożono w Federal-Mogul Gorzyce S. A.
EN
It presents Computer Aided Quality Control of Silumins System with use of TDA method. It serves characteristic largeness, appoint TDA method, which are elements of elaborated mathematic equations and it presents idea of communication of system with operator depending on H2 content in liquid silumin. The system has implemented in Federal-Mogul Gorzyce S. A.
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