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In this work the graphite morphology in ferritic ductile iron that contained chunky graphite was studied. Chunky graphite was shown to be a progressively degenerated morphology of …
chunky graphite but also lead to some spiky graphite when no rare earth is added. Chunky graphite negatively a ects the room temperature mechanical properties, though much more in the case of low silicon spheroidal graphite cast irons than in high silicon ones. Spiky graphite has been found to be much more detrimental and should thus be avoided ...
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Silicon is one of the elements that tend toward chunky graphite formation. By comparing the effect of Si and Ni on chunky graphite in heavy castings (micro/macro analysis), it was found that higher Si has a strong influence on chunky graphite formation, especially in castings with a slow cooling rate, while Ni promotes chunky graphite only in ...
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DOI: 10.1007/s40962-024-01324-6 Corpus ID: 269874420; Examples of Chunky Graphite Formation in Production of Ductile Iron Castings and Effective Countermeasures @article{Itofuji2024ExamplesOC, title={Examples of Chunky Graphite Formation in Production of Ductile Iron Castings and Effective Countermeasures}, author={Haruki Itofuji and Yutaka …
A R C H I V E S o f F O U N D R Y E N G I N E E R I N G V o l u m e 1 6, I s s u e 4 / 2 0 1 6, 5 9 - 60 59 Table 3. Chemical composition of inoculants
Degenerative graphite may form in late-solidifying sections of ductile iron castings, especially where section thickness is greater than 50 mm. Micrographs show a sample of chunky graphite at chunky graphite at 1:100 …
Chunky graphite formation in ductile cast irons: effect of silicon, carbon and rare earthsSubmitted on 4 Sep 2017 HAL is a multi-disciplinary open access archive for the
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The mechanical and physical properties of CG iron, for a given matrix microstructure, will reside between the properties of flake graphite iron and spheroidal graphite iron as shown schematically in Fig. 7.The more continuous nature of the compacted flakes will have physical properties closer to that of flakes (higher thermal conductivity and damping capacity), yet …
Existing theories on formation and growth mechanisms of chunky graphite are briefly reviewed. Fur-thermore, from a metallurgical point of view, causes for the appearance of chunky …
eutectic growth, which results in exploded or even chunky graphite. Possible reasons are long solidification times, high amounts of Si and the presence of Ce in the melt.1
In addition, some "degenerated" morphology, such as spiky, exploded, or chunky graphite, can result from incorrect melt treatment or unfavorable cooling conditions. Some typical examples of ...
Chunky graphite morphology negatively affect the mechanical properties of cast iron due to undercooling and presence of trace elements. Sertucha et al. showed the eutectic undercooling versus growth rate for chunky graphite (CHG) and nodular graphite (spheroidal) in a recent publication. From this figure it is seen that chunky graphite forms at ...
The form of graphite in the flotation band ranges from fairly well-formed hypereutectic nodules to a variety of undesirable forms, including "cauliflowered" and exploded nodules and chunky graphite. The undesirable forms become increasingly prevalent as the extent of flotation, section size and casting temperature increases.
F. Iacoviello et alii, Frattura ed Integrità Strutturale, 34 (2015) 406-414; DOI: 10.3221/IGF-ESIS.34.45 406 Focussed on Crack Paths Degenerated graphite nodules influence on fatigue crack paths in a ferritic ductile cast iron Franc Iacoviello, Vittorio Di Cocco Università di Cassino e del Lazio Meridionale, DiCeM, via G. Di Biasio 43, 03043 Cassino (FR), Italy [email …
resulting from the charges, are known to affect graphite shape. As examples, elements like Pb, Sb or Bi promote formation of intergranular lamellar graphite [1,2]. By addition of Ce to such melts lamellar graphite can be prevented, whereas by exceeding a critical amount of Ce exploded and chunky graphite will be formed [2].
exploded graphite versus chunky graphite in ductile irons ..., Grinding Mill / exploded graphite versus chunky graphite in ductile irons. ... Cement Plant Mill and Kiln; ... Froth flotation grinding Mill - 529 views; Go to Product Center. Engineering Analysis – …
lamellar graphite can be prevented, whereas by exceeding a critical amount of Ce exploded and chunky graphite will be formed [2]. There are different investigations about critical amounts of trace elements affecting graphite morphology in ductile cast iron as reviewed by Reynaud [3]. Buhr [2] reported that already small
Chunky graphite forms during eutectic solidification, in contrast to exploded graphite which forms during pro-eutectic precipitation. Chunky graphite develops as eutectic cells with …
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Differences from ideal or expected graphite shapes are of upmost importance for they directly affect the properties of components. A typical case is a deviation to sphericity that affects the mechanical properties, thermal conductivity and machinability of SGI [7, 8].Such irregularities in the contours are associated with more or less sharp outgrowths that contribute to stress …
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Chunky graphite appears easily in heavy-section spheroidal graphite cast irons and is known to affect their mechanical properties. A dedicated experiment has been developed to study the effect of ...
While the specialists almost unanimously claim that avoidance of chunky graphite in heavy sections cannot yet be rated a hundred percent process safe, 2,6,7,[13][14] [15] [16][17][18][19][20] a ...
SEM images of chunky graphite from a deep-etched industrial room-temperature sample: a) helical growth; b) cavity in the graphite; c) foliated dendrites. D.M. Stefanescu et al. / Acta Materialia ...
Degenerative (or, "chunky") graphite is likely to form in late-solidifying sections of ductile iron castings, especially where the section thickness is greater than 50 mm. At other times we find chunky graphite during the …
