The effect of cast Al-Si-Cu alloy solidification rate on alloy thermal characteristics

• Autorzy: Dobrzański, L. A. , Maniara, R. , Sokolowski, J. H.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In the metal casting industry, an improvement of component quality depends mainly on better control over the production parameters. Thus, a thermal analysis cooling curve of the alloy is used for process control in the aluminum casting industry. In this work effect of cooling rate on the size of the grains, SDAS, size of the β precipitation and thermal characteristic results of AC AlSi9Cu cast alloy have been described. The solidification process was studied using the cooling curve and crystallization curve at solidification rate ranging from 0,16 ºCs-1 up to 1,04 ºCs-1 Design/methodology/approach: The experimental alloy used in this investigation was prepared by mixing the ACAlSi5Cu commercial alloys and two master alloys AlSi49 and AlCu55. Thermal analysis tests were conducted using the UMSA Technology Platform. Cooling curve thermal analysis was performed on all samples using high sensitivity thermocouples of K type. Data were acquired by a high speed data acquisition system linked to a PC computer. Each chilled sample was sectioned horizontally where the tip of the thermocouple was located and it was prepared by standard grinding and polishing procedures. Optical microscopy was used to characterize the microstructure and intermetallic phases. Secondary Dendrite Arm Spacing measurements were carried out using an Leica Q-WinTM image analyzer. Findings: Increasing the cooling rate increases significantly the liquidus temperature, nucleation undercooling temperature, solidification range and decreases the recalescence undercooling temperature. Increasing cooling rate refines all microstructural features. Research limitations/implications: This paper presents results for one alloy - AC AlSi9Cu only, for the assessment of the Silicon Modification Level didn’t include the arrangement of a Si crystal in a matrix. Originality/value: Original value of the work is applied the artificial intelligence for the assessment of the Silicon Modification Level.

Słowa kluczowe

PL

metalografia ilościowa; analiza obrazu; analiza termiczna; charakterystyka termiczna

EN

quantitative metallography; image analysis; thermal analysis; thermal characteristics

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 217--220
• Opis fizyczny: Bibliogr. 15 poz., rys., tab., wykr.

Twórcy

autor

Dobrzański, L. A.

• Division of, Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland ,

autor

Maniara, R.

• Division of, Materials Processing Technology and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Sokolowski, J. H.

• Industrial Research Chair in Light Metals Casting Technology, University of Windsor, 401 Sunset Ave., N9B 3P4, Windsor, Ontario, Canada

Bibliografia

• [1] J.G. Kauffman, E.L. Rooy: Aluminum Alloy Castings, ASM International, Ohio 2005.
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• [3] L.A. Dobrzański, W. Kasprzak, J Sokołowski, R. Maniara, M. Krupiński: Applications of the derivation analysis for assessment of the ACAlSi7Cu alloy crystallization process cooled with different cooling rate, COMMENT 2005, Proceedings of the 13th International Scientific Conference, Gliwice-Wisła, 2005.
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• [13] Modification rating System for Structure of Hypoeutectik Aluminium Silicon Casting Alloys, KBI Aluminium Master Alloys Product Literature.
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