Influence of residual aluminium on solidification pattern of ductile iron
Authors: Chisamera, M.1; Riposan, I.2; Stan, S.1; White, D.3
Source: International Journal of Cast Metals Research, Volume 22, Number 6, December 2009 , pp. 401-410(10)
Publisher: Maney Publishing
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Abstract:
The present study describes the effect of a large range of final residual Al contents (0·002-0·05%) on thermal analysis parameters when added to a base iron (less than 0·003%Al) through preconditioning (FeSi, 5%Al), tundish-cover nodularisation (MgFeSi, 0·1-3%Al) or ladle inoculation (CaFeSi, 0·1-5%Al) in hypoeutectic (carbon equivalent=3·95-4·25%) ductile irons. The most important parameters of thermal analysis were beneficially influenced by residual Al and consequently resulted in higher eutectic temperatures and lower undercooling, higher temperature at the end of solidification, higher cooling rates at this temperature, etc. Aluminium residual of 0·005-0·02% appears to be beneficial, without the incidence of pinholes. The greatest benefits were achieved when Al was introduced into the iron via the inoculant. The second best was to have Al present in the base iron, added as Al bearing preconditioner. Aluminium added via the MgFeSi provided minor benefits.Keywords: DUCTILE IRON; THERMAL ANALYSIS; RESIDUAL ALUMINIUM
Document Type: Research article
DOI: 10.1179/174313309X436619
Affiliations: 1: Politehnica University of Bucharest, 313 Spl. Independentei, 060042 Bucharest, Romania 2: Politehnica University of Bucharest, 313 Spl. Independentei, 060042 Bucharest, Romania;, Email: riposan@foundry.pub.ro 3: Elkem Metals Inc., Pittsburgh, PA 15230-0266, USA
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