Evaluation of the Applicability of Computer-Aided Porosity Testing Methods for Different Pore Structures

Kazup, Ágota; Fegyverneki, György; Gácsi, Zoltán

doi:10.1007/s13632-022-00892-5

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…The RPT specimens cast during the experiments were investigated with X-ray computed tomography, which is reported to be a feasible method for the characterization of RPT samples by a growing number of studies [ 88 , 89 , 90 , 91 , 92 ]. Three parameters were investigated: the pore volume fraction [%], the volumetric pore number density [cm −3 ], and the specific pore surface area [mm −1 ], which gives the surface area of pores present in 1 mm 3 of the sample.…”

Section: Resultsmentioning

confidence: 99%

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Gyarmati

Bogoly²,

Stawarz³

et al. 2022

Materials

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Grain refiner particles, which are intended to induce the formation of fine equiaxed grain structure during the solidification of aluminum alloys, are prone to settling during the holding of the liquid metal, which phenomenon can affect not only the grain size but the spatial distribution of the double oxide films in the melt. In this study, the settling of Al3Ti inoculant particles, as well as its effects on melt quality and grain refinement, were studied. During the experiments, the Ti-concentration of a liquid Al-Si-Mg-Cu alloy was increased to 0.3 wt.% by the addition of Al-10%Ti master alloy at different melt temperatures. Particle settling and grain size evolution were studied by quantitative metallography, while the interactions of grain refiners and bifilms were investigated by scanning electron microscopy (SEM). The evolution of melt quality was assessed by the computed tomographic (CT) analysis of reduced pressure test (RPT) samples. It was found that effective grain refinement was only realized when the introduced blocky Al3Ti particles were dissolved and re-precipitated in the form of (Al,Si)3Ti at a lower temperature. Without dissolving at higher holding temperatures, Al3Ti particle settling has taken place within 10 min. The settling of (Al,Si)3Ti particles improved melt quality by the aided sedimentation of bifilms in the melt.

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Section: Resultsmentioning

confidence: 99%

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Gyarmati

Bogoly²,

Stawarz³

et al. 2022

Materials

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“…The thresholding procedure used was the iterative selection method. Finally, the percent porosity was the black pixels divided by the total pixels times one hundred [15].…”

Section: Micro-computed Tomography (Micro-ct)mentioning

confidence: 99%

Feasibility of Bonding High-Moisture-Content Wood Using Nothofagus chilean Species

Rosales,

Rodríguez-Grau,

Galarce

et al. 2023

Forests

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Appraising and protecting forests requires a management plan and the creation of innovative products for the market. The development of the green gluing technique could add value to native timber. However, there is a lack of knowledge concerning the response and the productive process of Nothofagus species using this technique. This work investigated the viability of implementing the green gluing method using three types of Nothofagus. Wood pieces were made using a one-component polyurethane adhesive. Delamination, shear tests, morphological characterization, and bond line thickness analysis tested their capacity. The results showed a variable response depending on the Nothofagus type, where the surface treatment could improve the green gluing performance. The findings highlight the relevance of increasing knowledge about the essayed species and their preparation to maintain their natural moisture condition.

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“…The density of the Cu-CNTs sintered sample was measured using the Archimedes principle [33]. The principle involves measuring the mass of an object in air and liquid According to the DoE provided in Table 2, for laser sintering, a fixed laser spot size of 5 mm was used, and the laser power varied from 300 W to 400 W. The scan speed was set at 1, 1.5, and 2 mm/s.…”

Section: Density Measurementmentioning

confidence: 99%

“…The density of the Cu-CNTs sintered sample was measured using the Archimedes principle [33]. The principle involves measuring the mass of an object in air and liquid and then using the resulting values to calculate the density and porosity of the sample.…”

Section: Density Measurementmentioning

confidence: 99%

Investigation on Optical Absorption and Reflection of Carbon Nanotubes Mixed Copper Composites for Laser Sintering Process Improvement

Ayub,

Khan,

McCarthy

et al. 2023

Metals

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Selective laser sintering (SLS) of copper components manufactured via powder metallurgy is widely studied due to minimal material wastage. However, copper has poor optical absorption when exposed to infrared (IR) lasers, such as in laser-based additive manufacturing or laser surface processing. To address this issue, an innovative approach to enhance the optical absorption of copper powders during infrared laser sintering is presented in this study. Carbon nanotubes (CNTs) have several unique properties, including their high surface area, plasmonic response, excellent conductivity, and optical absorption properties. CNTs were mixed with copper powders at different weight percentages using an acoustic method. The resulting Cu-CNT compositions were fabricated into pellets. The Box-Behnken Design of Experiments methodology was used to optimize the IR laser processing conditions for sintering. Spectroscopic analysis was conducted to evaluate the reflection and thermal absorption of the IR wavelengths by the Cu-CNT composites. Density and hardness measurements were taken for the laser-sintered Cu-CNT pellets. The coating of copper powders with CNTs demonstrated enhanced optical absorption and correspondingly reduced reflection. Due to the enhanced optical absorption, increased control and sensitivity of the laser sintering process was achieved, which enabled improvement in the mechanical properties of strength, hardness, and density, while also enabling control over the composite thermal expansion coefficient. A maximum average hardness of 66.5 HV was observed. Indentation test results of the samples revealed maximum tangential and radial stresses of 0.148 MPa and 0.058 Mpa, respectively.

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Evaluation of the Applicability of Computer-Aided Porosity Testing Methods for Different Pore Structures

Cited by 5 publications

References 23 publications

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Feasibility of Bonding High-Moisture-Content Wood Using Nothofagus chilean Species

Investigation on Optical Absorption and Reflection of Carbon Nanotubes Mixed Copper Composites for Laser Sintering Process Improvement

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