COMPARISON OF IMPACT OF IMMERSED AND MICRO-JET COOLING DURING QUENCHING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HYPOEUTECTIC SILUMIN AlSi7Mg0.3
DOI:
https://doi.org/10.7494/mafe.2017.43.3.153Keywords:
cast aluminum alloys, heat treatment, quenching, immersion cooling, micro-jet cooling, artificial aging, mechanical properties, metallographic researchAbstract
This article presents research the results of the mechanical properties at the ambient temperatureof hypoeutectic cast silumin EN AC-AlSi7Mg0.3 (according to EN 1706:2011; analogic to alloyA356 according to AA – the Aluminum Association). As related to the commonly known and usedprocess of immersion during quenching, the research also used a micro-jet system of cooling.After quenching, the experimental samples were also submitted to artificial aging in three differentvariations. The achieved results were compared with the mechanical properties of the alloyin the as-cast state.Samples from the experimental alloy were subjected to micro-jet cooling during quenching;in principle, they had a similar level of properties as related to the samples that were cooled byimmersion; only in some cases did the micro-jet cooling give better results. Further works in the field should be aimed at constructing machines for micro-jet cooling with water pressure levelssignificantly higher than the typical pressure of community waterworks.
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References
Novikov I.I.: Teoriya termicheskoy obrabotki metallov. Uchebnik. 3-ye izd. Metallurgiya, Moskva 1978 [Новиков И.И.: Теория термической обработки металлов. Учебник. 3-е изд. Металлургия, Москва 1978]
Adel M., Fawzy S.: Performance of Aluminum-Silicon Cast Alloys. Effect of alloying and trace elements on the microstructure and mechanical properties if Al-Si Alloys. LAP LAMBERT Academic Publishing, Mannheim 2010
PN-EN 1706:2011 – Aluminium i stopy aluminium. Odlewy. Skład chemiczny i własności mechaniczne. PKN, Warszawa 2011
Hatch J.E. (ed.): Properties and Selection: Nonferrous and Special-purpose Materials. 10th edition. ASM International, Ohio, USA 1975
Hatch J.E. (ed.): Aluminium. Properties and Physical Metallurgy. 5th edition. ASM International, Ohio, USA 1993
Aristova N.A., Kolobnev I.F.: Termicheskaya obrabotka liteynykh alyuminiyevykh splavov. Metallurgiya, Moskva 1977 [Аристова Н.А., Колобнев И.Ф.: Термическая обработка литейных алюминиевых сплавов. Металлургия, Москва 1977]
Czekaj E., Zych J., Kwak Z., Garbacz-Klempka A.: Quality Index of the AlSi7Mg0.3 Aluminium Casting Alloy Depending on the Heat Treatment Parameters. Archives of Foundry Engineering, 16, 3 (2016), 25–28. DOI: 10.1515/afe-2016-0043
Drouzy M.: Interpretation of Tensile Test Results Using Quality Index and Probable Elastic Limit-Application to Cast Al-Si-Mg Alloys. Revue de Métallurgie, 75, 1 (1978), 51–59
Górny Z., Czekaj E. et al.: Wpływ chłodzenia mikrostrumieniowego podczas hartowania (przesycania) na strukturę i właściwości wybranych stopów. Badania eksperymentalne i symulacyjne. In: Sprawozdanie końcowe z projektu badawczego nr 5940/B/TO2/2010/38 realizowanego na zlecenie MNiSW. Foundry Researche Institute, Krakow 2013 (unpublished), 137–149, 164–171, 179–190
Seifeddine S., Timelli G., Svensson I.L.: Influence of quench rate on the microstructure and mechanical properties of aluminium alloys A356 and A354. International Foundry Research/Giessereiforschung, 59, 1 (2007), 2–10
Aluminum Alloys Cast at Coastal Foundry. http://www.coastalfoundry.com/alloys-cast/aluminum-alloy/AlAlloysChemicalsMechanicals.pdf (Coastal Foundry Company) [16.12.2016]
