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Relationship between casting modulus and grain size in cast A356 aluminium alloys

Niklas, Andrea and Abaunza, Unai and Fernandez-Calvo, Ana Isabel and Lacaze, Jacques Relationship between casting modulus and grain size in cast A356 aluminium alloys. (2012) IOP Conference Series: Materials Science and Engineering, 27 (1). 1-6. ISSN 1757-8981

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Official URL: http://dx.doi.org/10.1088/1757-899X/27/1/012003


Microstructure of Al-Si alloy castings depends most generally on melt preparation and on the cooling rate imposed by the thermal modulus of the component. In the case of Al-Si alloys, emphasis is put during melt preparation on refinement of pro-eutectic (Al) grains and on modification of the Al-Si eutectic. Thermal analysis has been used since long to check melt preparation before casting, i.e. by analysis of the cooling curve during solidification of a sample cast in an instrumented cup. The conclusions drawn from such analysis are however valid for the particular cooling conditions of the cups. It thus appeared of interest to investigate how these conclusions could extrapolate to predict microstructure in complicated cast parts showing local changes in the solidification conditions. For that purpose, thermal analysis cups and instrumented sand and die castings with different thermal moduli and thus cooling rates have been made, and the whole set of cooling curves thus recorded has been analysed. A statistical analysis of the characteristic features of the cooling curves related to grain refinement in sand and die castings allowed determining the most significant parameters and expressing the cube of grain size as a polynomial of these parameters. After introduction of a further parameter quantifying melt refining an excellent correlation, with a R2 factor of 0.99 was obtained.

Item Type:Article
Additional Information:Thanks to Institut of physics editor. The definitive version is available at http://iopscience.iop.org The original PDF of the article can be found at IOP Conference Series: Materials Science and Engineering: http://iopscience.iop.org/1757-899X/27/1/012003/
HAL Id:hal-00859862
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > IK4 - Azterlan - Centro de Investigación Metalúrgica (SPAIN)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:09 Sep 2013 13:47

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