Density Variations during Solidification of Grey Cast Iron

Hellström, Kristina; Svidró, Péter; Diaconu, Lucian Vasile; Diószegi, Attila

doi:10.4028/www.scientific.net/msf.925.155

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…For the cell size measurements, five cells in one foam tomography rendering were measured both along and across the cell elongation axis. The relative densities of the foam blocks were calculated based on an average gray cast iron density of ≈7 g cm −3 …”

Section: Methodsmentioning

confidence: 99%

Foams of Gray Cast Iron as Efficient Energy Absorption Structures: A Feasibility Study

et al. 2019

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Gray cast iron foams are produced using a reticulated polyurethane by using a modified investment casting process. To evaluate the attributes of the produced micro-geometries, foam segments and single struts are investigated by light and electron microscopy in 2D, and synchrotron micro-computed tomography in 3D. Mechanical properties are determined by macro/micromechanical testing and nanoindentation. In the microstructure of the gray cast iron struts, both flake-like coarse type A and locally fine undercooled type D graphite particles are observed. The distribution of the two graphite types is heterogeneous and is the likely cause for the large scatter of the mechanical properties of the single struts. The high graphite content and the resulting brittle behavior of the struts lead to strong serrations in the stressstrain curve of the foams with a negative effect on energy absorption. We found a relatively low energy absorption efficiency of below 50% as compared to 75% in 316L austenitic steel struts. The small specimen size results in scale effects which strongly influence the mechanical properties of the foams. Further improvement in the fabrication of gray cast iron foams is needed to tailor graphite distributions and optimize performance of cast iron-based foams.

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Section: Methodsmentioning

confidence: 99%

Foams of Gray Cast Iron as Efficient Energy Absorption Structures: A Feasibility Study

et al. 2019

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“…Value Density (g/cm 3 ) [19] 7.200 Specific heat capacity (J/g*K) [19] 0.490 Thermal conductivity (J/s*cm*K) [19] 0.533 Thermal diffusivity (cm 2 /s) o 0.127 Molten temperature (K) [19] 1438.500 Molten enthalpy (J/g) [20] 240.000 o…”

Section: Propertymentioning

confidence: 99%

Microstructural Design of the Cast Iron via Laser Hardening with Defocused Beam of the Continuous Wave CO2 Laser

Ahuir-Torres

Sharp

Bakradze

et al. 2022

J. Phys.: Conf. Ser.

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The cast iron is widely used in mechanical parts due to its good properties, as damping, good fluidity, resistance to deformation, excellent machinability and low cost. However, the number of its applications are reduced because its low corrosion, wear and friction resistance. The microstructure of the metallic materials has high influence on these properties. Laser hardening can improve these properties via designing of the microstructure. The evaluation of the laser parameter influence on the microstructural features is vital for a correct design of the microstructure and therefore, good improvement of the metallic material properties. Although the various laser parameter influence has been analysed on sundry papers, the influence of the distance from focal point and scan speed in the laser hardening microstructures has been rarely evaluated in the literature. Thus, the influence of this parameter on the microstructures generated through laser hardening is the subject matter of this work. The experiments were carried out with continuous wave carbon dioxide laser on samples of ground cast iron. The atmosphere was air flow at 0.7MPa, the laser operated at 100W and the scan rates were 1mm/s and 5mm/s. The distances to focal point of the laser beams ranged from 0.0mm to 5.6mm. The microstructures of the samples were revealed via nital and evaluated with optical microscopy. This work shown that the microstructure of gray iron cast can be designed by mean of laser hardening. In addition, laser hardened zones had various microstructures (e.g. austenitic, martensitic, pearlite and dendritic). The type of the microstructures in laser treated zones was determined by distance from focal point and scan speed. Moreover, the width and the depth of the laser hardened zones were generally enlarged with the increasing of the distance from focal point. Furthermore, the laser irradiation at slow rates, i.e. 1mm/s, produced laser hardened zones larger than laser scan at 5mm/s. In future works, the hardness, wear and friction resistance of the laser hardened samples will be evaluated because the literature review indicates that austenitic and martensitic microstructures show high values of these properties.

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Density Variations during Solidification of Grey Cast Iron

Cited by 2 publications

References 13 publications

Foams of Gray Cast Iron as Efficient Energy Absorption Structures: A Feasibility Study

Foams of Gray Cast Iron as Efficient Energy Absorption Structures: A Feasibility Study

Microstructural Design of the Cast Iron via Laser Hardening with Defocused Beam of the Continuous Wave CO2 Laser

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