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Revisiting Thermal Analysis of Hypereutectic Spheroidal Graphite Cast Irons

Castro-Román, Manuel Jesus and Lacaze, Jacques and Regordosa, Anna and Sertucha, Jon and Campo-Castro, Raymundo Del Revisiting Thermal Analysis of Hypereutectic Spheroidal Graphite Cast Irons. (2020) Metallurgical and Materials Transactions A, 51 (12). 6373-6386. ISSN 1073-5623

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Official URL: https://doi.org/10.1007/S11661-020-06005-7

Abstract

This study deals with early solidification of hypereutectic cast irons at varying carbon content and roughly constant alloying additions. Thermal analysis of such alloys shows that the start of the eutectic reaction occurs at a nearly constant temperature for mildly hypereutectic compositions. A similar trend is observed with more hypereutectic compositions but at a higher starting temperature. This jump in the start temperature of the eutectic reaction has not been previously evidenced and is here addressed by considering primary precipitation of graphite. Limiting the analysis to spheroidal graphite cast irons, it is demonstrated that simulation of primary graphite precipitation based on a 2D nucleation/lateral growth model allows substantiating the experimental distinction found between mildly and highly hypereutectic cast irons. This modeling explains that highly hypereutectic alloys start eutectic solidification in a limited temperature range that is nearly insensitive to the initial carbon equivalent of the alloy and to inoculation. This approach also suggests that the start of the eutectic solidification of mildly hypereutectic cast irons is shifted to lower temperature until growth of austenite enriches the liquid in carbon to such an extent that growth of graphite becomes possible.

Item Type:Article
HAL Id:hal-03182155
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)
Other partners > Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional - CINVESTAV-IPN (MEXICO)
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Deposited On:26 Mar 2021 09:52

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