ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Critical Temperature Range in Standard and Ni-bearing Spheroidal Graphite Cast Irons
Roxana Maria GherguJon SertuchaYannick ThebaultJacques Lacaze
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JOURNALS OPEN ACCESS

2012 Volume 52 Issue 11 Pages 2036-2041

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Abstract

Describing the conditions for reaustenitization of spheroidal graphite cast irons is of interest for their heat-treatment after casting, e.g. for manufacturing austempered ductile irons. Differential thermal analysis has been used to characterize the direct eutectoid transformation and the reverse transformation, i.e. the reaustenitization. This has been applied to a standard and a Ni-bearing alloy, with a ferritic matrix for the former, both a ferritic and a pearlitic matrix for the latter. The results are discussed in relation with the stable and metastable three phase fields. While earlier description of the direct eutectoid transformation is confirmed, the one for reverse eutectoid has been found more complex and is amended.

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© 2012 by The Iron and Steel Institute of Japan
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