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1
Content available Effect of Manganese and Iron Content on Morphology of Iron Intermetallic Phases in AlSi7Mg0.3 Alloy
Podprocká R., Bolibruchová D.
Archives of Foundry Engineering
|
2018
|
Vol. 18, iss. 2
95--99
EN
Iron is presented as an impurity in Al-Si alloys and occurs in the form of the β-Al5FeSi phase formations. The presence of iron and other elements in the alloy causes the formation of large intermetallic phases. Due to the high brittleness of this phase, it reduces the mechanical properties and increases the porosity. Manganese is used to inhibit the formation of this detrimental phase. It changes the morphology of the phase to polyhedral crystals, skeletal formations, or Chinese script. The present article deals with the influence of various amounts of manganese (0.1; 0.2; 0.4; 0.6 wt. %) on the formation of iron-based intermetallic phases in the AlSi7Mg0.3 alloy with different levels of iron content (0.4; 0.8, 1.2 wt. %). The increase of iron content in each alloy caused the creation of more intermetallic compounds and this effect has been more significant with higher concentrations of manganese. In alloys where the amount of 1.2 wt. % iron is present, the shape of eutectic silicon grain changes from angular to short needle type.
2
Content available Influence of Nickel Addition on Properties of Secondary AlSi7Mg0.3 Alloy
Richtárech L., Bolibruchová D., Brůna M., Caiss J.
Archives of Foundry Engineering
|
2015
|
Vol. 15, iss. 2
95--98
EN
This paper deals with influence on segregation of iron based phases on the secondary alloy AlSi7Mg0.3 microstructure by nickel. Iron is the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In generally, iron is associated with the formation of Fe-rich intermetallic phases. It is impossible to remove iron from melt by standard operations. Some elements eliminates iron by changing iron intermetallic phase morphology, decreasing its extent and by improving alloy properties. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation with higher iron content and influence of nickel as iron corrector of iron based phases.
3
Content available Elimination of Iron Based Particles in Al-Si Alloy
Bolibruchová D., Richtárech L.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 1
9--12
EN
This paper deals with influence on segregation of iron based phases on the secondary alloy AlSi7Mg0.3 microstructure by chrome. Iron is the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In generally, iron is associated with the formation of Fe-rich phases. It is impossible to remove iron from melt by standard operations, but it is possible to eliminate its negative influence by addition some other elements that affect the segregation of intermetallics in less harmful type. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation with higher iron content and influence of chrome as iron corrector of iron based phases. By experimental work were used three different amounts of AlCr20 master alloy a three different temperature of chill mold. Our experimental work confirmed that chrome can be used as an iron corrector in Al-Si alloy, due to the change of intermetallic phases and shortening their length.
4
Content available Effect of the AlCr20 Addition on the Microstructure of Secondary AlSi7Mg0.3 Alloy
Bolibruchova D., Richtarech L.
Archives of Foundry Engineering
|
2014
|
Vol. 14, iss. 2
9--12
EN
This paper deals with influence of chrome addition and heat treatment on segregation of iron based phases in the secondary alloy AlSi7Mg0.3 microstructure by chrome and heat treatment. Iron is the most common and harmful impurity in aluminum casting alloys and has long been associated with an increase of casting defects. In generally, iron is associated with the formation of Fe-rich intermetallic phases. It is impossible to remove iron from melt by standard operations, but it is possible to eliminate its negative influence by addition some other elements that affect the segregation of intermetallics in less harmful type or by heat treatment. Realization of experiments and results of analysis show new view on solubility of iron based phases during melt preparation with higher iron content and influence of chrome as iron corrector of iron based phases.
5
Content available remote Wpływ szybkości chłodzenia na strukturę siluminu AlSi7Mg0,3
Orłowicz W., Tupaj M., Mróz M.
Archiwum Odlewnictwa
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2006
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R. 6, nr 18/1
125--130
PL
Praca dotyczy oceny wpływu szybkości chłodzenia produkcyjnego stopu AlSi7Mg na mikrostrukturę i zwartość odlewu. Badania wykonano na odlewach klinów z ochładzalnikiem. Stwierdzono, że wzrost szybkości chłodzenia pozwala na zmniejszenie wartości parametru strukturalnego λ2D – odległości pomiędzy gałęziami drugiego rzędu dendrytów fazy α(Al) oraz redukcję porowatości stopu.
EN
The effect of the cooling rate of the AlSi7Mg production alloy on casting microstructure and its compactness is assessed. Tests were carried out on wedge shaped castings with chills. The raising of alloy cooling rate was found to permit a reduction of the structural parameter, λ2D – spacing between secondary dendrite branches in α(Al) phase, as well as the reduction of alloy porosity.
6
Content available remote Dobór parametrów obróbki cieplnej stopu AISi7Mg0,3
Orłowicz W., Tupaj M., Mróz M.
Archiwum Odlewnictwa
|
2006
|
R. 6, nr 22
350-357
PL
W pracy badano wpływ obróbki cieplnej (przesycanie i starzenie) na twardość i mikrostrukturę stopu AISi7Mg0,3 modyfikowanego strontem. Próbki były przesycane z temperatury 540°C po różnym czasie wygrzewania i chłodzone w wodzie o temperaturze 20°C. Optymalny z uwagi na twardość okazał się czas wygrzewania 6 godzin w temperaturze 540°C. Po zastosowaniu takich warunków przesycania, próbki starzono w temperaturze 145°C, 155°C, 165°C lub 175°C w różnych czasach i następnie chłodzono w powietrzu. Najwyższą twardość uzyskano dla temperatury starzenia 175°C i czasu 8 godzin. Stwierdzono, że w trakcie wygrzewania, w miarę upływu czasu zmniejsza się ilość wydzieleń krzemu.
EN
The effect of heat treatment (solution heat treatment and aging) on hardness and microstructure of the AlSi7Mg0,3 alloy modified with strontium was studied. Samples were solution heat treated at 540°C for various time periods and cooled down in water at 20°C. The temperature of 540°C and solution heat treatment time of 6 hours appeared optimum in respect of hardness. After applying the above solution-heat-treatment conditions, the sampies were aged at 145°C, 155°C, 165°C and 175°C for various time periods and then cooled down in air. The highest hardness was achieved for aging temperature of 175°C and the time of 8 hours. Silicon precipitates were found to undergo spheroidizing in the course of solution heat treatment. Some precipitate grow with time at the expense of others. In consequence, the total number of silicon precipitates becomes reduced.
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