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The Effect of Water Mist Cooling of Casting Die on the Solidification, Microstructure and Properties of AlSi20 Alloy

100%

Władysiak R. , Kozuń A. , Pacyniak T.

tom Vol. 62, iss. 1

187--194

Unmodified AlSi20 alloy were casted at the research station, allowing for sequential multipoint cooling using a dedicated computer- controlled program. This method allows for the formation of the microstructure of hypereutectic AlSi20 alloy and also increases hardness. Primary silicon dendrites were found in the microstructure of cooled samples. Based on these dendrites, the formation of primary silicon particles is explained. Cooling of casting die with a water mist stream causes changes in solidification, which leads to expansion of the boundary layer with columnar crystals and shrinkage of the core zone with equiaxed crystals. It also causes more regular hardness distribution around pre-eutectic Si crystals, which can lead to tensile strength and machinability improvement.

Structure and Mechanical Properties of AlSiCuMg Alloy after Thermo Processing

63%

Piątkowski J. , Kamiński P.

tom Vol. 15, iss. 1

79--82

In the dissertation it has been shown, that so called „time-thermal treatment” (TTT) of the alloy in liquid state, as overheating the metal with around 250°C above the Tliq. and detaining it in this temperature for around 30 minutes, improves the mechanical properties (HB, Rm, R0,2). It was ascertained, that overheating the AlSi17Cu5Mg alloy aids the modification, resulting with microcrystalline structure. Uniform arrangement of the Si primeval crystals in the warp, and α(Al) solution type, supersaturated with alloying elements present in the base content (Cu, Mg) assures not only increased durability in the ambient temperature, but also at elevated temperature (250°C), what is an advantage, especially due to the use in car industry.

Crystallization of AlSi17Cu5Mg Alloy after Time-thermal Treatment

63%

Piątkowski J. , Kamiński P.

tom Vol. 15, iss. 1

83--86

In the dissertation it has been shown, that so called “time-thermal treatment” (TTT) of the alloy in liquid state as overheating the metal with around 250°C above Tliq. and detailing it in temperature for 30 to 40 minutes has the influence on changing the crystallization parameters (Tliq., TEmin., TEmax., TE(Me), TSol.). It was ascertained, that overheating the AlSi17Cu5Mg alloy substantially above Tliq. results with microcrystalline structure. Evenly distributed in the eutectic warp primeval silicon crystals and supersaturated with alloying additives of base content (Cu, Mg, Fe) of α(Al) solution, ensures not only increase durability in ambient temperature, but also at elevated temperature (250°C), what due to it’s use in car industry is an advantage.

Geometria nadtopień i struktura uszlachetnionych powierzchniowo odlewów z nadeutektycznego stopu Al-Si

63%

Mróz M. , Orłowicz A. W. , Tupaj M.

tom R. 5, nr 17

209--216

W pracy przedstawiono wyniki pomiaru geometrii nadtopień i parametrów strukturalnych warstwy wierzchniej odlewów ze stopu AK 20 uszlachetnionej szybką krystalizacją. Proces szybkiej krystalizacji realizowano z wykorzystaniem nadtapiania powierzchniowego odlewów plazmą łuku elektrycznego – metoda GTAW (Gas Tungsten Arc Welding). Stosowano natężenie prądu 100, 200 i 300 A oraz prędkość przemieszczania plazmy łuku elektrycznego 200, 400 i 800 mm/min. Określono związki pomiędzy parametrami technologicznymi procesu GTAW, a geometrią nadtopień i strukturą materiału z obszaru nadtopień.

In this work the results of measurement of the fusion geometry parameters and structural parameters of AK 20 alloy after rapid solidification were described. The rapid solidification process was realized with the GTAW method (Gas Tungsten Arc Welding).The current intensity 100A, 200A and 300A as well as electric travel speed 200 mm/min, 400 mm/min and 800 mm/min were used. The relationships between GTAW process parameters and fusion geometry parameters as well as structural parameters were defined.