Application of secondary ion mass spectrometry to study of graphite morphology in cast iron

Franklin, Steven O.; Stark, R. A.

doi:10.1179/030634584790420186

Cited by 18 publications

(5 citation statements)

References 3 publications

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“…The thickening rate depends on the nucleation rate of new blocks which then extend along the surface of the flake. Such blocks were reported by Franklin and Stark [38,39] who noted a periodic increase of the sulfur signal when carrying out depth profiles of graphite flakes using secondary ion mass spectrometry. The authors attributed this observation to the presence of sulfur atoms on the basal surfaces of graphite, where this element is known to preferentially adsorb.…”

Section: Feec Samplessupporting

confidence: 61%

Structure of graphite precipitates in cast iron

Theuwissen

Lacaze

Laffont

2016

Carbon

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This study presents microstructural investigations of graphite precipitates found in cast irons. Binary Fe eC, FeeCeSb and FeeCeCe alloys containing different graphite morphologies (flake and spheroidal) were produced and compared to commercial irons in an attempt to rationalize the effect of Sb and Ce on graphite growth. The extensive use of transmission electron microscopy (mainly electron diffraction and high resolution lattice fringe imaging) enabled further understanding of graphite growth mechanisms. It was found that the inner structure of graphite precipitates consists of growth blocks stacked upon each other, for all investigated morphologies. This suggests that graphite crystals develop mainly by a 2D nucleation and growth mechanism, and that the final shape of the precipitates is associated to the occurrence of crystallographic defects in the graphite lattice (such as twins, misorientations and rotations) during growth.

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Section: Feec Samplessupporting

confidence: 61%

Structure of graphite precipitates in cast iron

Theuwissen

Lacaze

Laffont

2016

Carbon

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“…Franklin et. al [12] made secondary ion mass spectroscopy (SIMS) analysis on flake and nodular graphite. Higher oxygen content was found in the flake graphite but sulfur content was much lower than oxygen.…”

Section: Introductionmentioning

confidence: 99%

Graphite Growth Morphologies in Cast Iron

Muhmond

Fredriksson

2014

MSF

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Graphite growth morphology was studied by using InLense detector on FEG-SEM after performing ion etching on the samples. Star like and circumferential growth mechanism of graphite was observed in the graphite nodules. Pure ternary alloy of hypo eutectic and hyper eutectic composition was treated with pure Mg, Ca and Sr, to study the effect of O and S concentration in the melt, on the transition of graphite morphology from nodular to vermicular/compacted and flake graphite. The change in the melt composition between the austenite dendrites due to micro-segregation of S, O and inoculants and their possible effects on the transition of graphite morphologies as well as the nucleation of new oxides/sulfides particles is discussed with the help of thermodynamics.

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“…Complementing chemical analyses mentioned in the Fig. 13. Misorientation profiles between the nodule and the outgrowth measured along the white dotted line in the IPF map; red dots give the misorientation with respect to the origin of the X axis, blue dots give the misorientation from one to the next point along the dotted line; arrows point out the misorientation gap from nodule to transition zone, then to green zone and finally to outgrowth; projection views of the hexagonal cell have been added to ease visualizing the changes in orientation; nano-aggregates are localized at the center of the blue dashed circle.…”

Section: Absorption Of Magnesium In Graphitementioning

confidence: 99%

On the role of impurities on spheroidal graphite degeneracy in cast irons

Domengès

Celis

Moisy

et al. 2021

Carbon

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Though manufacturing spheroidal graphite cast irons is a well established industrial process, good nodularity which is essential for mechanical properties rnay be hampered by several factors. Arnongst them is the presence of impurities at trace level which lead to the growth of protrusions and the question is how they can destroy the spheroidizing effect of rnagnesium For the first time, it is shown that such impurities are present together with magnesium at the int erface between spheroid and protrusion. For getting this result, site specific electron transparent lamellae were prepared using Focused Ion Bearn and characterized at nanornetric scale using atomic resolution scanning transmission electron microscope. It is also shown by autornatic crystal orientation mapping that there is no definite crystallo graphic rela tionship between protrusions and underlying spheroids.

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Application of secondary ion mass spectrometry to study of graphite morphology in cast iron

Cited by 18 publications

References 3 publications

Structure of graphite precipitates in cast iron

Structure of graphite precipitates in cast iron

Graphite Growth Morphologies in Cast Iron

On the role of impurities on spheroidal graphite degeneracy in cast irons

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