Effects of tertiary elements on the critical solidification rate of the flake-undercooled graphite transition of Fe-C alloys

Fujikawa, Takahiro; Nakamura, K.; Sumimoto, Haruyoshi; Kiguchi, Shoji; Hatate, Minoru

doi:10.1080/13640461.1999.11819292

Cited by 4 publications

(1 citation statement)

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“…Furthermore, it was observed that the critical growth rate for the transition from Types A to D graphite decreases when the sulphur content was increased [13] . This latter fi nding has been confi rmed by Fujikawa et al [14] for similar sulphur contents. This suggests that the adsorption of sulphur atoms on the basal planes [15] triggers twinning of graphite lamellae.…”

Section: Discussionsupporting

confidence: 73%

Some paradoxical observations about spheroidal graphite degeneracy

Lacaze

Sertucha

2018

China Foundry

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T he control of graphite shape in spheroidal graphite cast irons is primarily achieved by limited additions of magnesium, though rare earths may also be added to sustain the spheroidization treatment. To avoid fading of the spheroidization treatment, in particular when casting heavy-section parts, it could be tempting to overtreat the melt. However, it has been long recognized that magnesium and rare earth over-treatment leads to spheroidal graphite degenerating in chunky graphite. Conversely, under-treatment in magnesium or rare earths is the most usual way of preparing melts for obtaining compacted graphite which may thus be seen as another type of spheroidal graphite degeneracy, though a more appropriate way of thinking would consider it as "a balance between fl ake and nodular graphite" [1]. Except spheroidal graphite, all solidifi cation forms of

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Section: Discussionsupporting

confidence: 73%