Revisiting Thermal Analysis of Hypereutectic Spheroidal Graphite Cast Irons

Castro‐Román, M.; Lacaze, Jacques; Regordosa, Anna; Sertucha, Jon; Campo-Castro, R. del

doi:10.1007/s11661-020-06005-7

Cited by 12 publications

(14 citation statements)

References 18 publications

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“…With these results, the very high undercoolings sometimes experienced by austenite when the alloy is near eutectic, either slightly hypo-or mildly hypereutectic, has been analyzed as resulting from a coupling between dendritic growth of austenite and growth of stable eutectic, even when this latter is limited to a rim at the outer surface of the TA cup. These conclusions are very much in line with previous observations on mildly and strongly hypereutectic alloys [22], confirming that TA records on near eutectic alloys may give confusing results. This analysis also suggests why the often used eutectic carbon equivalent of 4.26 wt.% is lower than the assessed value at 4.34 wt.%.…”

Section: Discussionsupporting

confidence: 91%

Is Thermal Analysis Able to Provide Carbon and Silicon Contents of Cast Irons?

et al. 2022

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Section: Discussionsupporting

confidence: 91%

Is Thermal Analysis Able to Provide Carbon and Silicon Contents of Cast Irons?

et al. 2022

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“…in the prismatic direction) is limited by adsorption of magnesium atoms. Such a model implies that growth of primary graphite proceeds at some undercooling with respect to the graphite liquidus and it has been found to conveniently explain thermal analysis results [17]. What has not yet been sufficiently studied is the formation of the sectors just after the nucleation of the graphite.…”

Section: The Usual Structure Of Graphite Spheroids In Cast Ironsmentioning

confidence: 99%

On the role of interfacial segregation on graphite shape in cast irons

Lacaze

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Understanding spheroidal graphite growth in cast irons is a long standing problem for which several mechanisms have been proposed. During the last decade, observations using transmission electron microscopy added new information about the stacking of graphite layers, leading eventually to propose other mechanisms than previously thought of such as repeated 2D-nucleation of new growth blocks and their lateral extension at the surface of the spheroids. Furthermore, it has been recently realized that elements known to strongly affect graphite shape are also those that are surface active. This is illustrated here in the case of antimony which is known to lead to spheroidal graphite degeneration when added at some tens of ppm. Using atomic resolution microscopy, segregation of antimony could be evidenced at the graphite/matrix interface of both spheroids and protuberances. This strongly suggests that accumulation of antimony repelled magnesium from the graphite surface until growth of spiky protuberances replaced spheroidal growth.

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“…Because of their similar shape characterized by significant eutectic recalescence, records #1 through #4 and #10 through #13 have been reproduced together in Figure 3. For such slightly hypereutectic alloys, the primary precipitation of graphite leads to no thermal arrest and it is only when austenite forms that significant latent heat is released and appears with the T LA arrest [24]. As the temperature drops below T LA , the graphite continues to nucleate and begins to form eutectic cells with the austenite.…”

Section: Thermal Analysis and Microstructurementioning

confidence: 99%