Basic processes controlling the nucleation of graphite nodules in chill cast iron

Jacobs, Michael; Law, T. J.; Melford, D.A.; Stowell, M. J.

doi:10.1179/030716974803287816

Cited by 52 publications

(17 citation statements)

References 3 publications

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“…The average size of this type of inclusions has previously been found to be around 1.5 to 2.0 µm [1]. These types of inclusions can act as nucleation particles for graphite [1] and graphite may also have precipitated on some of the inclusions during the last part of the solidification or during the cooling to the room temperature [20,21].…”

Section: Small Particlesmentioning

confidence: 99%

Graphite nodule count and size distribution in thin-walled ductile cast iron

Pedersen

Tiedje

2008

Materials Characterization

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Section: Small Particlesmentioning

confidence: 99%

Graphite nodule count and size distribution in thin-walled ductile cast iron

Pedersen

Tiedje

2008

Materials Characterization

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“…Warrick [1] suggested that complex oxides and sulfides serve as the nuclei for flake graphite. Many other researchers came to similar conclusions, including Muzmudar et al, [2,3] Jacobs et al, [4] and Gadd et al [5] Kusakawa et al [6] have reported the presence of nonmetallic inclusions that exhibited the highest inoculation effect. Campbell [7] introduced the concept of a silica-rich oxide bifilm that nucleates on oxysulfide particles in the melt.…”

Section: Introductionmentioning

confidence: 52%

Relationship Between Inoculants and the Morphologies of MnS and Graphite in Gray Cast Iron

Muhmond

Fredriksson

2012

Metall Mater Trans B

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The influence of oxides and sulfides in gray cast iron on the growth morphologies of MnS and on the nucleation of graphite was experimentally investigated using scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDX) analysis with evidences that shows the possible nucleation sites for graphite nucleation. Thermodynamic studies have been done on the influence of varying sulfur concentrations on the nucleation of MnS in the melt and during solidification. The consumption of dissolved oxygen and sulfur in the melt during the cooling process was analyzed and we explored how this influenced the nucleation process of oxides and sulfides. A sequential nucleation concept of oxides and MnS is proposed in relation to the growth morphology of MnS and graphite with respect to the mechanical properties of cast iron. The nucleation of new oxides and sulfides was analyzed using thermodynamics and compared to our experimental results. Graphite nucleation on substrates other than MnS, such as MoS 2 oxides and (Mo,Cr)S, was experimentally analyzed along with the influence of the substrates on graphite nucleation and growth morphology.

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“…11) inclusion particles acted as heterogeneous nucleation sites for forming graphites during solidification, and the particles composed of Ca, Mg, Si, S and O were the primary nucleation sites for forming nodule graphite in ductile iron. Several researchers [12][13][14] also pointed out the nuclei of nodule graphite consisted of (Mg, Ca) sulfide, MgO and (Mg, Si, Al) N. The constituents of inclusion particles in chilled samples were very similar to those found in the nuclei of nodule graphite. So it was suggested that some inclusion particles emerged at/near the center of nodule graphite and thought to be nuclei for graphite.…”

Section: Methodsmentioning

confidence: 74%

Effects of Inclusion Particles on the Microstructure and Mechanical Properties of High Strength Austempered Ductile Iron

Shih

2003

Mater. Trans.

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Effects of inclusion particles on the microstructure and mechanical properties of high strength austempered ductile iron (ADI) were investigated in this study. Inclusion particles, especially when their sizes are less than 5 mm, were mostly found in intercellular regions. Whether an inclusion particle can induce the formation of acicular ferrite depends on Mn segregation. In intercellular region, acicular ferrite was hard to form in the vicinity of inclusion particles due to (1) serious Mn segregation, and/or (2) the Mg-enriched inclusions here in halo-like. Consequently the surrounding austenite remained to be blocky type after austempering treatment. The fatigue life cycles of ADIs were affected by the particle counts and the microstructure. Increasing the count of fine inclusions along with the effect of Mn segregation deteriorated the fatigue life and elongation of high strength ADIs.

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Basic processes controlling the nucleation of graphite nodules in chill cast iron

Cited by 52 publications

References 3 publications

Graphite nodule count and size distribution in thin-walled ductile cast iron

Graphite nodule count and size distribution in thin-walled ductile cast iron

Relationship Between Inoculants and the Morphologies of MnS and Graphite in Gray Cast Iron

Effects of Inclusion Particles on the Microstructure and Mechanical Properties of High Strength Austempered Ductile Iron

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