Inclusion Detection in Molten Aluminum: Current Art and New Avenues for In Situ Analysis

Hudson, S. W.; Apelian, Diran

doi:10.1007/s40962-016-0030-x

Cited by 30 publications

(22 citation statements)

References 41 publications

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“…where K is the K-mold value (dimensionless number), n is the number of examined fracture surfaces, and S is the total number of inclusions found in n pieces. 47 Besides inclusions, the number of pores was also evaluated for each sample. The surface of the found inclusions and pores was investigated with a Zeiss EVO MA 10 scanning electron microscope (SEM) equipped with an energydispersive X-ray spectroscopy (EDS) system.…”

Section: Melt Quality Assessmentmentioning

confidence: 99%

The Effects of Rotary Degassing Treatments on the Melt Quality of an Al–Si Casting Alloy

et al. 2020

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In order to produce cast components, which meet the quality requirements of the automotive and aerospace industries, the control of liquid metal quality prior to the casting process is essential. Rotary degassing is the most commonly used melt treatment method in the foundry industry, which can effectively reduce the inclusion and solute hydrogen content of the metal. This procedure is often combined with fluxing, which allows more efficient inclusion removal during melt processing. In this study, the effects of rotary degassing treatments executed with and without flux addition on the melt cleanliness were compared. The quality of the molten metal was characterized by the microscopic inspection of K-mold specimens, X-ray computed tomography of reduced pressure test samples, and by Density-Index evaluation. The inclusions found on the fracture surfaces of K-mold samples were analyzed with energy-dispersive X-ray spectroscopy. Based on the results, rotary degassing coupled with flux addition can be an effective inclusion and solute hydrogen removal technique that can significantly improve melt quality. On the other hand, rotary degassing executed without flux addition can increase the inclusion content of the melts. This can be attributed to the chemical reaction between the liquid alloy and the N 2 purging gas during the degassing process. It was also found that inclusion content highly influences the tendency to porosity formation.

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Section: Melt Quality Assessmentmentioning

confidence: 99%

The Effects of Rotary Degassing Treatments on the Melt Quality of an Al–Si Casting Alloy

et al. 2020

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“…where K is the K-mold value (dimensionless number), n is the number of examined fracture surfaces, and S is the total number of inclusions found in n pieces [35,36]. The surface of the found inclusions was investigated with a Zeiss EVO MA 10 scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDS) system.…”

Section: Melt Quality Assessmentmentioning

confidence: 99%

Investigation on Double Oxide Film Initiated Pore Formation in Aluminum Casting Alloys

Gyarmati,

Fegyverneki,

Tokár

et al. 2020

IJEMS

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The most common, and in fact, the most deleterious defects of aluminum casting alloys are the so-called double oxide films or bifilms, which have a central role in porosity formation, as they can easily unfurl and inflate into pores during the solidification of the alloys. Sr addition is generally used in the foundry industry for the modification of the eutectic Si phase of hypoeutectic Al-Si alloys. However, Sr microalloying usually leads to an increased pore formation tendency. As bifilms are preferred sites for pore formation, it should be expected that Sr additions have a significant effect on the number and/or the structure of double oxide films present in the melt. In this work, the relationship between Sr-concentration and the susceptibility to pore formation has been investigated through the evaluation of melt quality of melts which had different levels of Sr. The bifilm content of the melts was investigated by the analysis of K-mold specimens and X-ray computed tomography (CT) of reduced pressure test (RPT) samples. It was found that liquid alloys with a higher Sr concentration had a significantly greater tendency to pore formation, which can be explained by the presence of a larger number of bifilm defects in the liquid alloy.

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“…Inclusions can be observed in the form of single particles, clusters and agglomerates [3][4][5]. Inclusions reduce mechanical properties by detracting from the effective cross-sectional area when stress is applied and because of the concentration of stresses at the inclusion interface [6,7]. Inclusions in the melt can negatively influence melt fluidity and prevent interdendritic feeding [8,9].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fluxes on the Melt Quality of AlSi7MgCu Alloy

Gyarmati

Fegyverneki

Mende

et al. 2019

IJEMS

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The presence of inclusions such as oxides, carbides or refractory particles can be harmful to the mechanical and surface characteristics of castings. Inclusion-rich metals result in lower fluidity and feeding capability during casting. Nowadays, solid fluxes are widely used in foundries in order to reduce the inclusion content of aluminium melts. In this study, the effect of four different fluxes on the melt quality was studied. First, the inclusion content of the flux-treated melt, and then the properties of the fluxes (i.e. chemical composition and melting temperature) were examined.

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Inclusion Detection in Molten Aluminum: Current Art and New Avenues for In Situ Analysis

Cited by 30 publications

References 41 publications

The Effects of Rotary Degassing Treatments on the Melt Quality of an Al–Si Casting Alloy

The Effects of Rotary Degassing Treatments on the Melt Quality of an Al–Si Casting Alloy

Investigation on Double Oxide Film Initiated Pore Formation in Aluminum Casting Alloys

The Effect of Fluxes on the Melt Quality of AlSi7MgCu Alloy

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