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  1. 33 Archives of Foundry Engineering
  2. 17 Archives of Foundry
  3. 17 Archiwum Odlewnictwa
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  1. 11 Piątkowski J.
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1
Content available Evaluation of the Possibility of Applying Thermal Barrier Coatings to AlSi7Mg Alloy Castings
Mróz Marek, Rąb Patryk
Archives of Foundry Engineering
|
2023
|
Vol. 23, iss. 3
104--109
EN
This paper analyses the possibility of applying thermal barrier coatings (TBCs) onto a substrate made of the AlSi7Mg alloy, intended for, among other things, internal combustion engine components. Engine components made of aluminum-silicon alloys, especially pistons and valve heads, are exposed to high temperature, pressure and thermal shock resulting from the combustion of the fuel-air mixture. These factors cause degradation of these components and can lead to damage. To minimize the risk of damage to engine components caused by heat stress, one way is to apply TBCs. Applying TBCs coatings to engine components improves their durability, increases power output and reduces fuel consumption. The research scope includes the application of an Al2O3-TiO3 coating via the APS (Air Plasma Spraying or Atmospheric Plasma Spraying) method onto a substrate of the AlSi7Mg alloy, analysis of the microstructure and chemical composition of the substrate and coating material, and assessment of the quality of the coating's bond with the AlSi7Mg alloy substrate using the scratch test method.
2
Lantanowce: przegląd eutektycznych modyfikacji pod-eutektycznych stopów Al-Si. Część 1
Gursoy Ozen, Timelli Giulio
Przegląd Odlewnictwa
|
2022
|
Vol. 72, nr 5-6
256--261
PL
Modyfikowana struktura, podobna do włóknistej, znacznie poprawia finalne mechaniczne właściwości (głównie ciągliwość) stopów odlewniczych. Poza szeroko stosowanymi, komercyjnymi, eutektycznymi modyfikatorami, takimi jak Sr i Na, lantanowce wydają się być pozytywną alternatywą dla procesu modyfikacji eutektycznego Si w podeutektycznych stopach odlewniczych Al-Si. Wszystkie lantanowce mają podobne fizyczne i chemiczne właściwości takie jak gęstość, temperaturę topnienia i zjawiska zanikania, które zostały omówione i porównane w obecnym przeglądzie. One również mają promienie atomowe zbliżone do optymalnego promienia atomowego czynnika modyfikującego. Jednakże, mikrostrukturalne wydzielanie się eutektycznego Si jest ściśle związane z konkretnym pierwiastkiem i zawartością lantanowców, których obfitość, zasoby, wydobywanie, produkcja i sytuacja na rynku zostały wstępnie ocenione w tej pracy. Mechanizmy eutektycznej modyfikacji wzbudzane prze lantanowce nie są jeszcze dobrze poznane i wyjaśnione. Pozytywne i negatywne strony dodatków poszczególnych lantanowców celem chemicznej modyfikacji podeutektycznych stopów Al-Si, zostały w niniejszej pracy krytycznie omówione. Stosowanie lantanowców do eutektycznej modyfikacji Si w stopach Al-Si zostało przedyskutowane, zarówno biorąc pod uwagę efektywność jak ekonomikę procesu. Obecnie, wydaje się że aktualny koszt i efektywność lantanowców powodują, że jeszcze daleko do ich stosowania w przemyśle odlewniczym na dużą skalę.
EN
A modified fibrous-like eutectic structure strongly improves the final mechanical properties of Al-Si foundry alloys, especially ductility. Beside widely used commercial eutectic modifiers such as Sr and Na, lanthanides appear to be a possible alternative in the eutectic Si modification process for hypoeutectic Al-Si casting alloys. All lantha nides have similar physical and chemical properties, such as density, melting point, and fading phenomena, which have been compared in the present review. They also show atomic radii close to the optimal atomic radius for a modifying agent. However, the microstructural evolution of eutectic Si is strictly related to the specific element and content of lanthanides, whose abundance, reserve, mining, production and market situations have been preliminary evaluated in this paper. The eutectic modification mechanisms induced by lanthanides are not well-discussed and clarified yet. The advantages and disadvan tages of individual addition of lanthanides for chemical modification of hypoeutectic Al-Si alloys have been here critically reviewed. The use of lanthanides for eutectic Si modification in Al-Si alloys has been discussed from both effectiveness and economical point of views. Nowadays, the actual cost and their efficiency seem to make lanthanides still far to be used in foundry industry for commercial and large-scale applications.
3
Lantanowce: przegląd eutektycznych modyfikacji pod-eutektycznych stopów Al-Si. Część 2
Gursoy Ozen, Timelli Giulio
Przegląd Odlewnictwa
|
2022
|
Vol. 72, nr 9-10
494--500
PL
Zmodyfikowana - podobna do włóknistej - eutektyczna struktura znacznie ulepsza finalne mechaniczne właściwości (zwłaszcza ciągliwość) odlewniczych stopów Al-Si. Poza szeroko stosowanymi komercyjnymi modyfikatorami eutektyki, takimi jak Sr i Na, lantanowce okazują się możliwą alternatywą w procesie eutektycznej modyfikacji Si dla podeutektycznych stopów Al-Si. Wszystkie lantanowce mają podobne fizyczne i chemiczne właściwości, takie jak gęstość, temperatura topnienia, oraz zjawiska zanikania, które są porównywane w tym przeglądzie. Lantanowce również mają promienie atomowe bliskie optymalnemu promieniowi czynnika modyfikującego. Jednakże, mikrostrukturalne wydzielanie się eutektycznego Si jest ściśle związane z konkretnym pierwiastkiem i zawartością lantanowców, których obfitość, zasoby, wydobywanie, produkcja i sytuacja na rynkach zostały wstępnie omówione w tej pracy. Mechanizmy eutektycznej modyfikacji wzbudzane przez lantanowce nie są jeszcze ani dobrze przedyskutowane, ani wyjaśnione. Pozytywne i negatywne strony indywidualnych dodatków lantanowców celem chemicznej modyfikacji podeutektycznych stopów Al-Si zostały tu krytycznie omówione. Użycie lantanowców celem eutektycznej modyfikacji Si w stopach Al-Si, zostało przedyskutowane zarówno z punktu widzenia ekonomii, jak efektywności. Wydaje się, że obecnie - z uwagi na koszty i skuteczność - jeszcze daleko do tego żeby lantanowce zostały użyte w przemyśle odlewniczym i w komercyjnych zastosowaniach na dużą skalę.
EN
A modified fibrous-like eutectic structure strongly improves the final mechanical properties of Al-Si foundry alloys, especially ductility. Beside widely used commercial eutectic modifiers such as Sr and Na, lanthanides appear to be a possible alternative in the eutectic Si modification process for hypoeutectic Al-Si casting alloys. All lanthanides have similar physical and chemical properties, such as density, melting point, and fading phenomena, which have been compared in the present review. They also show atomic radii close to the optimal atomic radius for a modifying agent. However, the microstructural evolution of eutectic Si is strictly related to the specific element and content of lanthanides, whose abundance, reserve, mining, production and market situations have been preliminary evaluated in this paper. The eutectic modification mechanisms induced by lanthanides are not well-discussed and clarified yet. The advantages and disadvantages of individual addition of lanthanides for chemical modification of hypoeutectic Al-Si alloys have been here critically reviewed. The use of lanthanides for eutectic Si modification in Al-Si alloys has been discussed from both effectiveness and economical point of views. Nowadays, the actual cost and their efficiency seem to make lanthanides still far from being used in foundry industry for commercial and large-scale applications.
4
Content available Plasma Coatings on Aluminium-Silicon Alloy Surfaces
Długosz P., Garbacz-Klempka A., Piwońska J., Darłak P., Młynarczyk M.
Archives of Foundry Engineering
|
2021
|
Vol. 21, iss. 3
96--101
EN
Plasma oxidation, similarly to anodic oxidation (anodizing), are classified as electrochemical surface treatment of metals such as Al, Mg, Ti and their alloys. This type of treatment is used to make surface of castings, plastically processed products, shaped with incremental methods to suitable for certain requirements. The most important role of the micro plasma coating is to protect the metal surface against corrosion. It is well known that coating of aluminium alloys containing silicon using anodic oxidation causes significant difficulties. They are linked to the eutectic nature of this alloy and result in a lack of coverage in silicon-related areas. The coating structure in these areas is discontinuous. In order to eliminate this phenomenon, it is required to apply oxidation coatings using the PEO (Plasma Electrolytic Oxidation) method. It allows a consistent, crystalline coating to be formed. This study presents the mechanical properties of the coatings applied to Al-Si alloy using the PEO method. As part of the testing, the coating thickness, microhardness and scratch resistance were determined. On the basis of the results obtained, it was concluded that the thickness of the coatings complies with the requirements of conventional anodizing. Additionally, microhardness values exceeded the results obtained with standard methods.
5
Content available The Effect of Modifier on the Microstructure of the AlSi10CuNiMn Alloy
Cais Jaromir, Heinrich Jiri, Jirounkova Klara
Advances in Science and Technology. Research Journal
|
2020
|
Vol. 14, no 2
13--18
EN
This paper deals with different types of modifiers and their effect on the microstructure of the Al-Si alloy. For the purposes of this research, strontium, antimony and calcium were used as the modifiers of the AlSi10CuNiMn alloy. Unmodified alloy was cast in order to be compared with the alloy modified by different modifiers in various concentrations. The results of this research were analysed via light and electron microscopy.
6
Content available Study of Nonmetallic Inclusions in Aluminum–Silicon Alloys
Galek Tomasz, Łączek Andrzej, Łysiak Karol
Advances in Manufacturing Science and Technology
|
2020
|
Vol. 44, nr 1
28-31
EN
In this article, a study of nonmetallic inclusions introduced during the casting process of the aluminum–silicon alloy is presented. The samples were investigated using a scanning electron microscope to find the chemical composition and X-ray tomography to check the volumetric content of the non-metallic inclusions. The samples were made from AlSi7Mg alloy, used for car wheels, with 7% weight content of Si, 89% of Al, and 0.3% of Mg. The main goal of our investigations was to find out the chemical composition of the impurities and to identify the stage of the casting process at which the impurities are introduced.
7
Content available Improvement of Al-Si Alloy Fatigue Strength by Means of Refining and Modification
Tupaj M., Orłowicz A. W., Trytek A., Mróz M.
Archives of Foundry Engineering
|
2019
|
iss. 4
61--66
EN
The paper presents results of a study concerning an AlSi7Mg alloy and the effect of subjecting the liquid metal to four different processes: conventional refining with hexachloroethane; the same refining followed by modification with titanium, boron, and sodium; refining by purging with argon carried out in parallel with modification with titanium and boron salts and strontium; and parallel refining with argon and modification with titanium, boron, and sodium salts. The effect of these four processes on compactness of the material, parameters of microstructure, and fatigue strength of AlSi7Mg alloy after heat treatment. It has been found that the highest compactness (the lowest porosity ratio value) and the most favorable values of the examined parameters of microstructure were demonstrated by the alloy obtained with the use of the process including parallel purging with argon and modification with salts of titanium, boron, and sodium. It has been found that in the fatigue cracking process observed in all the four variants of the liquid metal treatment, the crucial role in initiation of fatigue cracks was played by porosity. Application of the process consisting in refining by purging with argon parallel to modification with Ti, B, and Na salts allowed to refine the microstructure and reduce significantly porosity of the alloy extending thus the time of initiation and propagation of fatigue cracks. The ultimate effect consisted in a distinct increase of the fatigue limit value.
8
Content available Estimation of Mold Filling Ability and Volume Deficit Characteristics of Cast Al-Si Alloys
Santhi S., Vadayar S., Srinivasan S.
Archives of Foundry Engineering
|
2019
|
iss. 3
55--65
EN
Production of defect free castings requires good understanding of casting characteristics like mold filling ability and volume deficit characteristic. Pin test piece with cylindrical cores proposed by Engler and Ellerbrok was used to study the mold filling ability. Volume deficit characteristics experiments were conducted using the method designed by Engler. Alloy composition, Mold coat and Pouring temperature were considered as process parameters for the present study and experimental plan has been taken up through design of experiments. The alloy composition is most significant in influencing the mold filling ability, where as pouring temperature is for volume deficit. The Correlation Co-efficient value obtained is -0.98901 indicating strong a negative relation between mold filling ability and volume deficit characteristics. Negative values indicate a relationship between mold filling ability and volume deficit such that as values for mold filling ability increase, for volume deficit decrease.
9
Content available Influence CuAl10Fe3Mn2 Additive on Ultimate Tensile Strength and WEAR of Al-9%SiMg Alloy
Lipiński T.
Tribologia
|
2018
|
nr 3
83--89
EN
One of the most common castings applied in industrial production is aluminium-silicon alloy (ca. 9% Si with Mg). The Al-SiMg alloys have high corrosion resistance, high strength to weight ratio with modifications, very good castability, a low thermal-expansion coefficient, and relatively good wear resistance. These properties make it possible to widely apply the foundry Al-9% SiMg alloy to number of aviation, automotive, and others materials working on tribological applications. Similar to silumins, the aluminium bronze CuAl10Fe3Mn2 is characterized by good mechanical properties and wear and corrosion resistance. This paper presents the research on the treatment of Al-9%SiMg alloy with a composition of CuAl10Fe3Mn2 in different mass ranges. The experiments were conducted by a factor plan 23 for three independent variables. The main additions were strontium, Al-9%SiMg, aluminium bronze, as well as pure or melted with raw silumin. The effect of the tested additions on the microstructure and tensile strength of the Al-9%SiMg alloy was presented in figures. All analysed parameters (mechanical and tribological) of the hypo-eutectic Al-9%SiMg alloy with tested bronze additions are improved. Based on the analysis of the study results, it was found that the microstructure and tensile strength of the tested alloy are determined through the contents introduced of CuAl10Fe3Mn2 to the alloy.
PL
Jednym z najczęściej stosowanych w produkcji przemysłowej stopów odlewniczych jest stop aluminium--krzem (ok. 9% Si z dodatkiem Mg). Stopy Al-SiMg charakteryzują się wysoką odpornością na korozję, w stanie zmodyfikowanym wysokim stosunkiem wytrzymałości do wagi odlewu, bardzo dobrą lejnością, niskim współczynnikiem rozszerzalności cieplnej, względnie dobrą odpornością na zużycie. Te właściwości umożliwiają szerokie zastosowanie odlewniczego stopu Al-9% SiMg do wielu materiałów lotniczych, motoryzacyjnych i innych pracujących również w zastosowaniach tribologicznych. Podobnie jak w przypadku siluminu brąz aluminiowy CuAl10Fe3Mn2 charakteryzuje się dobrymi właściwościami mechanicznymi, zużyciem i odpornością na korozję. W artykule przedstawiono badania dotyczące obróbki stopu Al-9% SiMg składnikiem CuAl10Fe3Mn2 w różnych zakresach masowych. Eksperymenty przeprowadzono za pomocą planu czynnikowego 23 dla trzech niezależnych zmiennych. Głównym dodatkiem były: stront Al-9%SiMg, brąz aluminiowy, zarówno czysty, jak i stopiony z surowym siluminem. Wpływ badanych dodatków na mikrostrukturę i wytrzymałość na rozciąganie stopu Al-9% SiMg przedstawiono na rysunkach. Wszystkie analizowane parametry (mechaniczne i tribologiczne) stopu podeutektycznego Al-9% SiMg z badanym dodatkiem brązu zostały poprawione. Na podstawie analizy wyników badań stwierdzono, że mikrostruktura i właściwości mechaniczne badanego stopu są określone przez zawartość CuAl10Fe3Mn2 wprowadzoną do stopu.
10
Content available Evaluation of the Effect of the Cr, Mo, V and W Content in an Al-Si Alloy Used for Pressure Casting on its Proof Stress
Szymczak T., Szymszal J., Gumienny G.
Archives of Foundry Engineering
|
2018
|
Vol. 18, iss. 2
105--111
EN
The study presents the results of the application of a statistical analysis for the evaluation of the effect of high-melting additions introduced into a pressure cast Al-Si alloy on the obtained level of its proof stress Rp0.2. The base Al-Si alloy used for the tests was a typical alloy used for pressure casting grade EN AC-46000. The base alloy was enriched with high-melting additions, such as: Cr, Mo, V and W. The additions were introduced into the base Al-Si alloy in all the possible combinations. The content of the particular high-melting addition in the Al-Si alloy was within the scope of 0.05 to 0.50%. The investigations were performed on both the base alloy and alloy with the high-melting element additions. Within the implementation of the studies, the values of Rp0.2 were determined for all the considered chemical compositions of the Al-Si alloy. A database was created for the statistical analysis, containing the independent variables (chemical composition data) and dependent variables (examined Rp0.2 values). The performed statistical analysis aimed at determining whether the examined high-melting additions had a significant effect on the level of Rp0.2 of the Al-Si alloy as well as optimizing their contents in order to obtain the highest values of the Al-Si alloy's proof stress Rp0.2. The analyses showed that each considered high-melting addition introduced into the Al-Si alloy in a proper amount can cause an increase of the proof stress Rp0.2 of the alloy, and the optimal content of each examined high-melting addition in respect of the highest obtained value of Rp0.2 equals 0.05%.
11
Content available Modifications ALSI7MG0.3 alloys trough CA, SR and SB
Cais Jaromír, Lysoňková Irena, Kraus Pavel
Advances in Science and Technology. Research Journal
|
2018
|
Vol. 12, no 2
180--187
EN
This article deals with examing the effect of modifier on changes in microstructure of the alloy AlSi7Mg0.3. The content of the experiment was to examine the effect of addition of calcium, stroncium, and antimony to change the morphology of the eutectic silicon in the alloy type of Al-Si (namely AlSi7Mg0.3). Besides changes in the morphology of eutectic silicon was explored focused on character exlusion modifiers within microstructure of the modified alloy. Examination of the microstructure was realized by scanning electron microscopy and complemented by EDX analysis of the examined samples.
12
Content available Quality control of cylinder head casting
Tillova E., Chalupova M., Kucharikova L.
Production Engineering Archives
|
2017
|
Vol. 14
3--6
EN
New challenges for the Aluminium alloys used for the production of castings for automotive engine components result from an evolutionary trend of internal combustion engines towards higher specific power output. Cylinder heads, in particular, have to withstand higher operating temperature and stress levels. Present work describes quality control of microstructure (Si-morphologhy and Si-size) and mechanical properties (UTS, elongation, Brinell hardness) of cylinder head casting as effect of different T6 heat treatment (solution heat treatment time - 2, 3, 4, 5, 6, 7 hours). The data obtained from this study will be used to improve process control, and to help the selection of heat treatment of the casting for future products.
13
Content available remote The mechanical properties of AlSi coatings made by PVD technology
Kucharska B., Wróbel-Knysak A.
Mechanik
|
2017
|
R. 90, nr 1
66--67
PL
Porównano mechaniczne właściwości (mikrotwardość i test rysy) powłok AlSi wykonanych metodą PVD magnetronowego rozpylania stopów o zawartości 7–20% Si. Większe stężenie Si zwiększało opór odkształcania powłok wyrażony głębokością rysy. Lepsze właściwości mechaniczne miały powłoki ze stopów modyfikowanych TiBAl.
EN
The mechanical properties (microhardness and scratch test) of AlSi coatings made by PVD magnetron sputtering method from alloys with 7-20%Si were compared. Higher concentration of Si increased deformation resistance of the coating, expressed by depth of scratch. Improved mechanical properties had coatings from alloys modified by TiBAl refiner.
14
Content available The Application of ATD and DSC Methods to Study of the EN AC-48000 Alloy Phase Transformations
Piątkowski J., Przeliorz R., Szymszal J.
Archives of Foundry Engineering
|
2017
|
Vol. 17, iss. 2
207--211
EN
Tests concerning EN AC 48000 (AlSi12CuNiMg) alloy phase transition covered (ATD) thermal analysis and (DSC) differential scanning calorimetry specifying characteristic temperatures and enthalpy of transformations. ATD thermal analysis shows that during cooling there exist: pre-eutectic crystallization effect of Al9Fe2Si phase, double eutectic and crystallization α(Al)+β(Si) and multi-component eutectic crystallization. During heating, DSC curve showed endothermic effect connected with melting of the eutectic α(Al)+β(Si) and phases: Al2Cu, Al3Ni, Mg2Si and Al9Fe2Si being its components. The enthalpy of this transformation constitutes approx. +392 J g-1. During freezing of the alloy, DSC curve showed two exothermal reactions. One is most likely connected with crystallization of Al9Fe2Si phase and the second one comes from freezing of the eutectic α(Al)+β(Si). The enthalpy of this transformation constitutes approx. –340 J g-1. Calorimetric test was accompanied by structural test (SEM) conducted with the use of optical microscope Reichert and scanning microscope Hitachi S-4200. There occurred solution's dendrites α(Al), eutectic silicon crystal (β) and two types of eutectic solution: double eutectic α(Al)+β(Si) and multi-component eutectic α+AlSiCuNiMg+β.
15
Content available Application of FEM Analysis for Evaluation of the Stress and Deformation Distributions in the Top Layer of A390.0 Alloy During Friction
Wieszała R., Piątkowski J., Bąkowski H.
Archives of Foundry Engineering
|
2017
|
Vol. 17, iss. 1
228--234
EN
The paper presents an analysis of the effect of shape of primary silicon crystals on the sizes of stresses and deformations in a surface layer of A390.0 alloy by Finite Elements Method (FEM). Analysis of stereological characteristics of the studied alloy, performed based on a quantitative metallographic analysis in combination with a statistical analysis, was used for this purpose. The presented simulation tests showed not only the deposition depth of maximum stresses and strains, but also allowed for determining the aforementioned values depending on the shape of the silicon crystals. The studied material is intended for pistons of internal combustion engines, therefore the analysis of the surface layer corresponded to conditions during friction in a piston-cylinder system of an internal combustion engine having power of up to 100 kW. The obtained results showed important differences in the values of stresses and strains up to 15% between various shape of the silicon crystals. Crystals with sharp edges caused higher stresses and deformation locally than those with rounded shapes.
16
Content available Tribological Properties of AlSi17Cu5Mg Alloy Modified with CuP Master Alloy with Various Speeds of Friction
Piątkowski J., Wieszała R.
Archives of Foundry Engineering
|
2016
|
Vol. 16, iss. 1
45--48
EN
The paper presents the influence of modification with phosphorus (CuP10) on the tribological properties of the alloy AlSi17Cu5Mg coupled abrasively with cast-iron EN GJL-350. Tests of coefficient of friction and wear of mass were conducted on tribological tester T-01. An important aspect in the assessment of the tribological properties is the analysis of initial material microstructure in reference to silumin which underwent modification with phosphorus. It was found that the difference in structure of tested materials, mainly sizes of primary silicon crystals significantly influences the tribological properties whereas the speed change of the friction knot does not have such big influence.
17
Content available The Influence of Laser Surface Remelting on the Microstructure of EN AC-48000 Cast Alloy
Piątkowski J., Grabowski A., Czerepak M.
Archives of Foundry Engineering
|
2016
|
Vol. 16, iss. 4
217--221
EN
Paper present a thermal analysis of laser heating and remelting of EN AC-48000 (EN AC-AlSi12CuNiMg) cast alloy used mainly for casting pistons of internal combustion engines. Laser optics were arranged such that the impingement spot size on the material was a circular with beam radius rb changes from 7 to 1500 μm. The laser surface remelting was performed under argon flow. The resulting temperature distribution, cooling rate distribution, temperature gradients and the depth of remelting are related to the laser power density and scanning velocity. The formation of microstructure during solidification after laser surface remelting of tested alloy was explained. Laser treatment of alloy tests were perform by changing the three parameters: the power of the laser beam, radius and crystallization rate. The laser surface remelting needs the selection such selection of the parameters, which leads to a significant disintegration of the structure. This method is able to increase surface hardness, for example in layered castings used for pistons in automotive engines.
18
Content available The Effect of Cooling Rate on Properties of Intermetallic Phase in a Complex Al-Si Alloy
Tupaj M., Orłowicz A. W., Mróz M., Trytek A., Markowska O.
Archives of Foundry Engineering
|
2016
|
Vol. 16, iss. 3
125--128
EN
The cooling rate is one of the main tools available to the process engineer by means of which it is possible to influence the crystallisation process. Imposing a desired microstructure on a casting as early as in the casting solidification phase widens significantly the scope of technological options at disposal in the process of aluminium-silicon alloy parts design and application. By changing the cooling rate it is possible to influence the course of the crystallisation process and thus also the material properties of individual microstructure components. In the study reported in this paper it has been found that the increase of cooling rate within the range of solidification temperatures of a complex aluminium-silicon alloy resulted in a decrease of values of the instrumented indentation hardness (HIT) and the instrumented indentation elastic modulus (EIT) characterising the intermetallic phase occurring in the form of polygons, rich in aluminium, iron, silicon, manganese, and chromium, containing also copper, nickel, and vanadium. Increased cooling rate resulted in supersaturation of the matrix with alloying elements.
19
Content available Quality Index of the AlSi7Mg0.3 Aluminium Casting Alloy Depending on the Heat Treatment Parameters
Czekaj E., Zych J., Kwak Z., Garbacz-Klempka A.
Archives of Foundry Engineering
|
2016
|
Vol. 16, iss. 3
25--28
EN
Issues connected with high quality casting alloys are important for responsible construction elements working in hard conditions. Traditionally, the quality of aluminium casting alloy refers to such microstructure properties as the presence of inclusions and intermetallic phases or porosity. At present, in most cases, Quality index refers to the level of mechanical properties – especially strength parameters, e.g.: UTS, YS, HB, E (Young’s Modulus), K1c (stress intensity factor). Quality indexes are often presented as a function of density. However, generally it is known, that operating durability of construction elements depends both on the strength and plastic of the material. Therefore, for several years now, in specialist literature, the concept of quality index (QI) was present, combines these two important qualities of construction material. The work presents the results of QI research for casting hypoeutectic silumin type EN AC-42100 (EN AC-AlSi7Mg0.3), depending on different variants of heat treatment, including jet cooling during solution treatment.
20
Content available Influence of Casting Conditions on Tribological Properties of A390.0 Alloy
Piątkowski J., Wieszała R., Gontarczyk A.
Archives of Foundry Engineering
|
2016
|
Vol. 16, iss. 3
95--98
EN
The paper presents tribological properties of A390.0 (AlSi17Cu5Mg) alloy coupled in abrasive action with EN-GJL-350 grey cast-iron. The silumin was prepared with the use of two different technologies which differed in terms of cooling speed. In the first case the alloy was modified with foundry alloy CuP10 and cast to a standard tester ATD and in case of second option the modified alloy was cast into steel casting die. Due to different speed of heat removal the silumins varied in structure, particularly with size of primary crystals of silicon and their distribution in matrix which had a significant influence of friction coefficient in conditions of dry friction.
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