Extended Method of Volume Change Measurements during Solidification of Lamellar Graphite Iron

Svidró, Péter; Diószegi, Attila; Jönsson, Pär G.

doi:10.4028/www.scientific.net/msf.925.163

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…For the 3D-measurements, a spherical vessel filled with liquid grey cast iron was used. [14] The volume change of the sphere was measured at three points at the surface and an average of the change in radial direction was calculated at each timestep.…”

Section: Experimental Workmentioning

confidence: 99%

Density Variations during Solidification of Grey Cast Iron

Hellström

Svidró

Diaconu

et al. 2018

MSF

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As part of moving towards a sustainable production of diesel engines for heavy vehicle applications, the ability to predict casting defects has become ever so important. In order to model the solidification process for cast components correctly, it is of essence to know how the material will actually behave. To produce sound castings, often of complex geometry, the industry relies on various simulation software for the prediction and avoidance of defects. Thermophysical properties, such as density, play an important part in these simulations.Previous measurements of how the volume of liquid grey iron changes with temperature has been made with a conventional dilatometer. Measurements have also been made in the austenitic range, then on iron-carbon-silicon alloys with a carbon content lower than 1.5 wt%. Based on these measurements the density variations during solidification were calculated. The scope for this paper is to model the volume changes during solidification with the control volume finite difference method, using data from the density measurements.

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Section: Experimental Workmentioning

confidence: 99%

Density Variations during Solidification of Grey Cast Iron

Hellström

Svidró

Diaconu

et al. 2018

MSF

Self Cite

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Relationships Between Macrostructure and Microstructure in Lamellar Graphite Iron Castings

Domeij,

Diószegi

2024

Inter Metalcast

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Spherical sheet steel molds filled with gray iron melts of varying chemical compositions and metallurgical conditions were air-cooled until solid, followed directly by austempering to preserve the austenite grain structure. The castings were studied using a combination of cooling curves and quantitative metallography, in order to clarify control of the austenite grain structure and its impact on the local microstructure. A novel method utilizing fast Fourier transform provided visual overview of macroscopic trends in the scale of the flake graphite structure. Castings inoculated with Sr-containing ferrosilicon featured finer eutectic cell structure but coarser equiaxed structure of austenite, emphasizing that melt treatments applied to control the graphite structure may have unintended effects on the austenite grain structure. In most non-inoculated castings, the microstructure was banded, with alternating layers of coarse and fine flake graphite with distance from the casting surface. The extent of the columnar zone of austenite grains showed no correlation with the graphite structure nor the volume fraction of dendrites. The volume-to-surface ratio of dendrites was more uniform in the columnar zone, but increased toward the center in the equiaxed zone. The casting with the highest carbon equivalent (4.34), featured zones containing finer dendrites and graphite. These zones appear to be gaps in the early solidification structure which filled later by secondary dendritic growth from surrounding austenite. This highlights that high carbon equivalent may lead to poor dendrite coherency which can make the microstructure less uniform and less predictable.

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Study of the Formation of the Structure of Gray Cast Iron by the Method of Thermographic Analysis

et al. 2021

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The work is devoted to the study of the effect of an exothermic carbon-containing additive of a facing layer of a sandy-clay molding mixture on the eutectic transformation of cast iron. For this, the method of thermographic analysis was used and metallographic analysis of the metal under study was carried out. It is shown that the results obtained by thermographic analysis have a correlation with the structure of cast iron. The introduction of a carbon-containing additive into the composition of the facing mixture led to the formation of a favorable structure of the prototype, characteristic of gray cast iron.

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Extended Method of Volume Change Measurements during Solidification of Lamellar Graphite Iron

Cited by 3 publications

References 26 publications

Density Variations during Solidification of Grey Cast Iron

Density Variations during Solidification of Grey Cast Iron

Relationships Between Macrostructure and Microstructure in Lamellar Graphite Iron Castings

Study of the Formation of the Structure of Gray Cast Iron by the Method of Thermographic Analysis

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