Thermodynamic Analysis of Cast Irons Solidification With Various Types of Graphite

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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“…Elbel et. al [14] also recorded the oxygen activity for FG, CG and SG at 1350 °C which are 0.97 ppm, 0.30 ppm and 0.16 ppm respectively.…”

Section: Introductionmentioning

confidence: 95%

Graphite Growth Morphologies in Cast Iron

Muhmond

Fredriksson

2014

MSF

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“…9 Another research was conducted by Elbel and Hampl and concluded that titanium content higher than 0?1% greatly enlarged the danger of pinhole occurrence. 10 Svensson et al conducted a series of effects of alloying elements on CGI and found that Cu and Sn do not influence the vermicular ratio while they strongly promote the pearlite and therefore the mechanical properties. [11][12][13] However, Sn was demonstrated by Shaban and his colleagues to increase the percentage of compacted graphite and graphite aspect ratio, which is disobedient to the results of Svensson.…”

Section: Introductionmentioning

confidence: 99%

Effect of tin on microstructure and mechanical properties of compacted graphite iron

Lyu

Sun

Liu

et al. 2015

International Journal of Cast Metals Research

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This experiment investigated the effect of tin in an amount up to 0?121 wt-% on the microstructure and mechanical properties of compacted graphite iron. Graphite and matrix evolution was emphasised with the help of scanning electron microscopy. The results indicate that Sn in experimental range reduces graphite size. Pearlite quantity would increase with the increasing Sn and reaches over 95% when Sn is .0?057 wt-%. Sn helps to narrow the lamellar spacing of pearlite from sorbitic pearlite (320 nm) to troostitic pearlite (83 nm) when Sn increases from 0?003 to 0?057 wt-%. Appropriate Sn addition promotes the tensile strength and impact toughness, and the samples containing 0?057 wt-%Sn perform the highest values of 410?7 MPa and 9?11 J cm 22 respectively. Elongation declines with increasing Sn content because of the emergence of more pearlite. Samples containing excessive Sn experience sharp deterioration in mechanical properties due to brittle cementite. Y. Lyu et al. Effect of tin on properties of CGI International Journal of Cast Metals Research 2015 VOL NO 3 28 5 265 Downloaded by [University of Sussex Library] at 04:48 22 June 2016 4 Energy dispersive spectroscopy analysis of massive phase in sample containing 0.121 wt-%Sn 6 Lamellar spacing of samples containing a 0.003 wt-%Sn and b 0.057 wt-%Sn 5 Energy dispersive spectroscopy analysis of samples containing 0.092 wt-%Sn Y. Lyu et al. Effect of tin on properties of CGI

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