Thermal analysis of nodular and lamellar eutectic cast iron under different cooling rates

Tinoco, José; Delvasto, Pedro; Quintero, Omar A.; Fredriksson, Hasse

doi:10.1080/13640461.2003.11819558

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…[7,[10][11][12] A plausible explanation for this population appearing in the low nodularity specimens is that the relatively rapid growth of the vermicular eutectic interferes with the continuous nucleation of graphite nodules. Continuous nucleation of new nodules through most of solidification has been reported for SGI [5,36] and cast irons with 40 to 50 pct nodularity. [37] It appears reasonable that, for a given moderate cooling rate and nucleation potential, there will exist a nodularity where the vermicular eutectic, with its higher growth velocity, generates more heat than dissipating from the casting.…”

Section: G Late Graphite Nodulesmentioning

confidence: 99%

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Domeij

Hernando

Diószegi

2018

Metall Mater Trans B

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An SGI was machined into 400 g cylindrical pieces and remelted in an electrical resistance furnace protected by Ar gas to produce materials ranging from SGI to CGI. The graphite morphology was controlled by varying the holding time at 1723 K (1450°C) between 10 and 60 minutes. The discrete sectional size distribution of nodules by number density was measured on cross sections of the specimens and translated to volumetric distribution by volume fraction. Subpopulations of nodules were distinguished by fitting Gaussian distribution functions to the measured distribution. Primary and eutectic graphite, were found to account for most of the volume of nodular graphite in all cases. For holding times of 40 minutes and greater, corresponding to nodularity roughly below 40 pct, the primary subpopulation was very small and difficult to distinguish, leaving eutectic nodules as the dominant subpopulation. The mode and standard deviation of the two subpopulations were roughly independent of nodularity. Moreover, the nodular and vermicular graphite were segregated in the microstructure. In conclusion, the results suggest that the parallel development of the vermicular eutectic had small influence on the size distribution of eutectic graphite nodules.

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Section: G Late Graphite Nodulesmentioning

confidence: 99%

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Domeij

Hernando

Diószegi

2018

Metall Mater Trans B

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“…Owing to the relationship between cooling curves characteristics and microstructure features, thermal analysis has thus been developed for obtaining information regarding graphite morphology [1][2][3][4][5][6] as well as nucleation potential of graphite during solidification and inoculation efficiency. [7][8][9][10] It has been further extended for latent heat evaluation 4,[11][12][13] and for improving process variables, [7][8][14][15][16][17][18] e.g. with the aim at predicting final mechanical properties and hardness values 19,20) or for minimizing casting defects such as shrinkage tendency.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts

et al. 2009

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“…Thus, the structural pearlite crystallisation is more possible in eutectoid range. According to these results, the final metallic structure can be expressed as Ferrite(%)~A 1 Te min zA 2 RzA3I G zA 4 Ve max z A 5 V trans zA 6 (1)…”

Section: Discussionmentioning

confidence: 99%

“…In the last decades, thermal analysis techniques have been used in foundries as an experimental method to obtain information about the chemical composition (carbon equivalent) of irons, 1,2 inoculation efficiency, mechanical properties, 3 graphite shape, 4 latent heat calculations, [4][5][6][7] graphitic nucleation potential during the solidification, 8 shrinkage tendency in cast alloys, 9 oxidation state of the iron 10 and hardness prediction. 11 Based on these analyses, several systems relating cooling curves to casting properties have been developed and applied in foundry processes.…”

Section: Introductionmentioning

confidence: 99%

Prediction of solid state structure based on eutectic and eutectoid transformation parameters in spheroidal graphite irons

Sertucha¹,

Súarez²,

Izaga³

et al. 2006

International Journal of Cast Metals Research

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The aim of the present work is to predict experimentally the structural trend of liquid iron based on its solidification features and the subsequent solid state transition. Both transformation processes in SG iron samples are simultaneously studied by means of industrial thermal analysis techniques. Experimental parameters are established in both cases in order to quantify the main metallurgical facts and correlate them with the structural properties of different alloys used in real manufacturing processes. A computer aided program has been designed for the treatment of the cooling curves.A large number of experimental tests using different chemical compositions were made. After curves treatment, several studies have been conducted to correlate the thermal parameters obtained and the structural properties detected via metallographic inspections. The influence of the solidification parameters on carbon diffusion process and the resulting structures is discussed. A new structural model was developed in order to predict the ferrite content on the basis of thermal evolution of SG iron. Nucleation potential (inoculation grade), carbide formation tendency and solid state evolution of metal are evaluated and final structure distribution is accurately estimated.

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Thermal analysis of nodular and lamellar eutectic cast iron under different cooling rates

Cited by 6 publications

References 4 publications

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Size Distribution of Graphite Nodules in Hypereutectic Cast Irons of Varying Nodularity

Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts

Prediction of solid state structure based on eutectic and eutectoid transformation parameters in spheroidal graphite irons

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