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Purpose: In this work the metallographic microstructure analysis of the investigated AlSi7Cu3Mg aluminium cast alloy was performed for samples cooled with different cooling rate settings. The preformed investigations are subjected to the analysis of cooling rate influence on the phase morphology. Design/methodology/approach: The solidification process itself is analysed using the UMSA device by appliance of the Derivative Thermo Analysis. The influence of the cooling rate on the alloy microstructure was investigated using computer aided image analysis, in this work also the content of particular phases was analysed, as well the percentage of pinholes compared to the chosen cooling rate. Findings: The treated sample is without holes, cracks and defects as well as has a slightly higher hardness value compared to the as-cast material. Research limitations/implications: The investigated samples were made of the cylindrical shape and were cooled in the range of 0.2°C/s to 1.25°C/s. In this work also the derivative thermoanalysis was performed to determine the correlation between the chosen cooling rate and the microstructure as well changes in the derivative curve shape. For alloy cooling with chosen cooling rate as well for the derivative thermo-analysis the UMSA analysator was applied. Practical implications: The investigated material can find its use in the foundry industry; an improvement of component quality depends mainly on better control over the production parameters. Originality/value: The originality of this work is based on applying of regulated cooling rate of aluminium alloy for structure and mechanical properties changes. As an effect of this study it will be possible to understand and to influence the mechanism of structure forming, refinement and nucleation. Also a better understanding of the thermal characteristics will be provided to achieve a desirable phase morphology required for application of this material under production conditions.
Wydawca
Rocznik
Tom
Strony
58--65
Opis fizyczny
Bibliogr. 20 poz., rys., tabl.
Twórcy
autor
autor
autor
autor
- Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland, mariusz.krupinski@polsl.pl
Bibliografia
- [1]L. Bäckerud, G. Chai, J. Tamminen, Solidification Characteristics of Aluminum Alloys, AFS, 1992.
- [2]L.A. Dobrzański, R. Maniara, J.H. Sokolowski, The effect of cast Al-Si-Cu alloy solidification rate on alloy thermal characteristics, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 217-220.
- [3]J. Szajnar, T. Wróbel, Methods of inoculation of pure aluminium structure, Journal of Achievements in Materials and Manufacturing Engineering 27/1 (2008) 95-98.
- [4]H. Yamagata, W. Kasprzak, M. Aniolek, H. Kurita, J.H. Sokolowski, The effect of average cooling rates on the microstructure of the Al-20% Si high pressure die casting alloy used for monolithic cylinder blocks, Journal of Materials Processing Technology 203 (2008) 333-341.
- [5]J.P. Anson, J.E. Gruzleski, The quantitative discrimination between shrinkage and gas microporosity in cast aluminum alloys using spatial data analysis, Materials Characterization 43 (1999) 319-335.
- [6]P.D. Lee, A. Chirazi, R.C. Atwood, W. Wan, Multiscale modelling of solidification microstructures, including microsegregation and microporosity, in an Al-Si-Cu alloy, Materials Science and Engineering A 365 (2004) 57-65.
- [7]D.G. Prakash, B. Prasanna, D. Regener, Computational microstructure analyzing technique for quantitative characterization of shrinkage and gas pores in pressure die cast AZ91 magnesium alloys, Computational Materials Science 32 (2005) 480-488.
- [8]L. Wojnar, K.J. Kurzydłowski, J. Szala, Practice of image analysis, PTS, Cracow, 2002 (in Polish).
- [9]W.T. Kierkus, J.H. Sokolowski, Recent Advances in Cooling Curve Analysis: A New Method for determining the ‘Base Line’ Equation, AFS Transactions 66 (1999) 161-167.
- [10]L.J. Yang, The effect of casting temperature on the properties of squeeze cast aluminium and zinc alloys, Journal of Materials Processing Technology 140 (2003) 391-396.
- [11]Y.H. Zhu, Phase transformations of eutectoid Zn-Al alloys, Journal of Materials Science 36 (2001) 3973-3980.
- [12] B. Krupińska, L.A. Dobrzański, Z. Rdzawski, K. Labisz, Cooling rate influence on microstructure of the Zn-Al cast alloy, Journal of Achievements in Materials and Manufacturing Engineering 38/2 (2010)115-122.
- [13] E.M. da Costa, C.E. da Costa, F. Dalla Vecchia, C. Rick, M. Scherer, C.A. dos Santos, B.A. Dedavid, Study of the influence of copper and magnesium additions on the microstructure formation of Zn-Al hypoeutectic alloys, Journal of Alloys and Compounds 488/1 (2009) 89-99.
- [14] E. Fraś, Alloys crystallisation, WNT, Warsaw, 2003 (in Polish).
- [15] J. Sobczak, Innovations in foundry, Part 1, Institute of Foundry, Cracow, 2007 (in Polish).
- [16] A.A Prensyakov, Y.A Gorban, V.V Chervyakova, The aluminium – zinc phase diagram, Russian Journal of Physical Chemistry 6 (1961) 632-633.
- [17] B.K. Prasad, O.P. Modi, Slurry wear characteristics of zinc-based alloys: Effects of sand content of slurry, silicon addition to alloy system and traversal distance, Transactions of Nonferrous Metals Society of China 19/2 (2009) 277-286.
- [18] R. MacKay, M. Djurdjevic, J.H. Sokolowski, The Effect of Cooling Rate on the Fraction Solid of the Metallurgical Reaction in the 319 Alloy, AFS Transactions 25 (2000) 521-529.
- [19] L.A. Dobrzański, M. Krupiński, K. Labisz, Derivative thermo analysis of the near eutectic Al-Si-Cu alloy, Archives of Foundry Engineering 8/4 (2008) 37-40.
- [20] M. Krupiński, K. Labisz, L.A. Dobrzański, Z. Rdzawski, Derivative thermo analysis of the Al-Si cast alloy with addition of rare earths metals, Archives of Foundry Engineering 10/1 (2010) 79-82.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BOS2-0023-0009