Archives of Foundry Engineering

Hren, Iryna; Svobodová, Jaroslava; Michna, Štefan

doi:10.24425/afe.2018.125180

2018

DOI: 10.24425/afe.2018.125180

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Archives of Foundry Engineering

Iryna Hren¹,

Jaroslava Svobodová²,

Štefan Michna³

Abstract: The research described in this contribution is focused on fractographic analysis of the fracture area of newly developed eutectic silumin type AlSi9NiCuMg0.5 (AA 4032), which was developed and patented by a team of staff of the Faculty of Mechanical Engineering. The paper presents determination of the cause of casting cracks in operating conditions. Fractographic analysis of the fracture area, identification of the structure of the casting, identification of structural components on the surface of the fracture… Show more

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Cited by 5 publications

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Impact of Iron Contamination on Liquid Properties and Microstructural Evolution in AlSi20

Tisha,

Toenjes,

Ellendt

2024

Adv Eng Mater

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Additive manufacturing processes enable highly flexible and scalable shaping while maintaining rapid solidification processing conditions. This combination makes additive manufacturing particularly attractive for recycling contaminated alloys, as it allows critical brittle phases to be refined and utilized as alloying elements. However, little is known about the impact of contaminants on the fluid properties of liquid metals. Herein, thermodynamic modeling and experimental methods are combined to investigate the properties of AlSi20 and its contaminated variant, (AlSi20)95Fe5. The oscillating droplet method is used to experimentally determine surface tension and analyze solidified droplets to evaluate microstructure for different cooling rates. The findings indicate that while contaminants have a minor effect on fluid properties, they significantly influence microstructural properties.

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Impact of Iron Contamination on Liquid Properties and Microstructural Evolution in AlSi20

Tisha,

Toenjes,

Ellendt

2024

Adv Eng Mater

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Effect of multidirectional forging on grain structure and mechanical properties of hypereutectic Al–20%Si alloys with added refiners and modifiers

Nagaraj,

Dutt,

Manjunath

et al. 2024

Canadian Metallurgical Quarterly

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Analysis of the defects occurrence on the functional surfaces of individual mould segments for the tyre production from AlSi7Mg0.3Sr

Hren

Michna

Svobodová

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The basic prerequisite for obtaining a quality casting according to the requirements and specifics of the customer is the production of the mould (in our case using low-pressure die-casting) without the occurrence of surface defects in the form of cracks, scabs, microshrinkages and local depressions. In this case, the mould segments for the tyre production are those which show tiny cracks or scabs on the functional surface of the castings that define the surface quality of the resulting product. It is necessary to analyse these defects in order to eliminate the causes of their formation in the casting process. For this reason, a new alloy of eutectic silumin AlSi9 alloyed with Mg, Mn and modified Sr was prepared in order to improve the fluidity and maintain the mechanical properties of the material up to 250 ℃ The subject of the study was the analysis of the surface defects of the mould, including the analysis of the chemical composition (energy-dispersive X-ray) and microstructure in the defect area. In order to investigate the subsurface layer of defects, metallographic specimens of cross-sections were prepared by means of mould, which were examined by light and electron microscopy. The detailed microstructural characterization of individual elements was performed on lamellas of the mould studied using transmission electron microscopy. An X-ray diffraction analysis was performed to investigate the residual stress at the defects area very closely. It has been found that a smaller number of defects on the functional surfaces can be obtained by changing the mould position during casting.

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Archives of Foundry Engineering

Cited by 5 publications

References 9 publications

Impact of Iron Contamination on Liquid Properties and Microstructural Evolution in AlSi20

Impact of Iron Contamination on Liquid Properties and Microstructural Evolution in AlSi20

Effect of multidirectional forging on grain structure and mechanical properties of hypereutectic Al–20%Si alloys with added refiners and modifiers

Analysis of the defects occurrence on the functional surfaces of individual mould segments for the tyre production from AlSi7Mg0.3Sr

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