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Effect of various dopant elements on primary graphite growth

Valle, Nathalie and Theuwissen, Koenraad and Sertucha, Jon and Lacaze, Jacques Effect of various dopant elements on primary graphite growth. (2012) IOP Conference Series: Materials Science and Engineering, 27 (1). ISSN 1757-899X

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Official URL: http://dx.doi.org/10.1088/1757-899X/27/1/012026

Abstract

Five spheroidal graphite cast irons were investigated, a usual ferritic grade and four pearlitic alloys containing Cu and doped with Sb, Sn and Ti. These alloys were remelted in a graphite crucible, leading to volatilization of the magnesium added for spheroidization and to carbon saturation of the liquid. The alloys were then cooled down and maintained at a temperature above the eutectic temperature. During this step, primary graphite could develop showing various features depending on the doping elements added. The largest effects were that of Ti which greatly reduces graphite nucleation and growth, and that of Sb which leads to rounded agglomerates instead of lamellar graphite. The samples have been investigated with secondary ion mass spectrometry to enlighten distribution of elements in primary graphite. SIMS analysis showed almost even distribution of elements, including Mg and Al (from the inoculant) in the ferritic grade, while uneven distribution was evident in all doped alloys. Investigations are going on to clarify if the uneven distribution is associated with structural defects in the graphite precipitates.

Item Type:Article
Additional Information:Thanks to IOP Publishing editor. The definitive version is available at http://iopscience.iop.org The original PDF can be found at IOP Conference Series: Materials Science and Engineering website: http://iopscience.iop.org/1757-899X/27/1/012026/
HAL Id:hal-00860750
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)
Other partners > Centre de Recherche Public - CRP Gabriel Lippmann (LUXEMBOURG)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:11 Sep 2013 07:08

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