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Metals 2015, 5(1), 256-288; doi:10.3390/met5010256

Role of Alloying Additions in the Solidification Kinetics and Resultant Chilling Tendency and Chill of Cast Iron

1
Foundry Institute, AGH University of Science and Technology, Reymonta 23, Cracow 30-059, Poland
2
Department of Materials Science and Engineering, University of Wisconsin Milwaukee, 3200 N. Cramer Street, Milwaukee, WI 53211, USA
Edward Fras recently passed away on 15 January 2013
*
Author to whom correspondence should be addressed.
Academic Editor: Anders E. W. Jarfors
Received: 10 January 2015 / Revised: 17 February 2015 / Accepted: 25 February 2015 / Published: 4 March 2015
(This article belongs to the Special Issue Advances in Solidification Processing)

Abstract

The present work describes the effect of the solidification processing and alloy chemistry on the chilling tendency index, CT, and the chill, w, of wedge-shaped castings made of cast iron. In this work, theoretical predictions were experimentally verified for the role of elements, such as C, Si, Mn, P and S, on the cast iron CT. In addition, inoculation and fading effects were considered in the experimental outcome. Accordingly, the graphite nucleation coefficients, Ns, b, the eutectic cell growth coefficient, μ, and the critical cooling rate, Qcr, for the development of eutectic cementite (chill) were all determined as a function of the cast iron chemistry and time after inoculation. In particular, it was found that increasing the Mn and S contents, as well as the time after inoculation lowers the critical cooling rate, thus increasing the chilling tendency of the cast iron. In contrast, C, Si and P increase the critical cooling rate, and as a result, they reduce the cast iron CT and chill. View Full-Text
Keywords: chill; chilling tendency; gray cast iron; role of C; Si; Mn; P; Mn; inoculation effects chill; chilling tendency; gray cast iron; role of C; Si; Mn; P; Mn; inoculation effects
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fraś, E.; Lopez, H.F.; Kawalec, M.; Gorny, M. Role of Alloying Additions in the Solidification Kinetics and Resultant Chilling Tendency and Chill of Cast Iron. Metals 2015, 5, 256-288.

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