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12-08-2016 | Issue 11/2016

Metallurgical and Materials Transactions A 11/2016

Study of the Eutectoid Transformation in Nodular Cast Irons in Relation to Solidification Microsegregation

Journal:
Metallurgical and Materials Transactions A > Issue 11/2016
Authors:
Alexandre Freulon, Philippe de Parseval, Claudie Josse, Jacques Bourdie, Jacques Lacaze
Important notes

Electronic supplementary material

The online version of this article (doi:10.​1007/​s11661-016-3692-3) contains supplementary material, which is available to authorized users.
Manuscript submitted March 10, 2016.

Abstract

Eutectoid transformation in cast irons may proceed in the stable or the metastable systems giving ferrite and graphite for the former and pearlite for the latter. The present work demonstrates that composition profiles across ferrite/pearlite boundaries are smooth and similar to those issued from the solidification step. No trace of long-range diffusion of substitutional solutes due to austenite decomposition could be observed. In turn, this ascertains that both stable and metastable transformations proceed with the product matrix—either ferrite or pearlite—inheriting the parent austenite content in substitutional solutes. This result sustains a physical model for eutectoid transformation based on the so-called local para-equilibrium which is commonly used for describing solid-state transformation in steels.

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