TY - CONF AU - Gyarmati, Gábor AU - Ádám, Pálóczi AU - Dorottya, Somfai AU - Ferenczi, Tibor AU - Kéri, Zoltán ED - Csüllög, Mihály ED - Mankovits, Tamás TI - Analysis of Different Commercial Solid Fluxes Used for the Melt Treatment of Casting Aluminum Alloys T2 - Book of Abstracts from 9th International Scientific Conference on Advances in Mechanical Engineering PB - University of Debrecen CY - Debrecen SN - 9783036414454 PY - 2023 SP - 29 UR - https://m2.mtmt.hu/api/publication/34394378 ID - 34394378 LA - English DB - MTMT ER - TY - JOUR AU - Gyarmati, Gábor AU - Kéri, Zoltán AU - Mende, Tamás AU - Molnár, Dániel TI - Analysis of the Quality of Incoming AlSi9Mn Alloy Ingots JF - INTERNATIONAL JOURNAL OF METALCASTING J2 - INT J METALCAST PY - 2023 PG - 16 SN - 1939-5981 DO - 10.1007/s40962-023-01146-y UR - https://m2.mtmt.hu/api/publication/34144274 ID - 34144274 AB - Previous research revealed that the quality of the ingots produced by different primary or secondary alloy suppliers can differ remarkably. In this way, the quality of the liquid metal and the castings produced from it can be affected by the impurity content of the ingots used as charge material. In this work, a modified reduced pressure test (RPT) technique, which is based on the remelting of samples extracted from ingots, was applied to investigate the quality of primary AlSi9Mn ingots made by horizontal direct-chill (HDC) casting and gravity casting techniques. For the evaluation of metal quality, image analysis of the cross sections was applied. Pore area fraction, number density, normalized bifilm index, and normalized total pore perimeter were determined, and the relationships between the different metrics were analyzed. The results were compared with the melt quality assessment of the as-melted batches made from the ingots. Solidification simulations, thermal analysis, and microstructural investigations were conducted to investigate the solidification conditions of traditional and remelted RPT samples. Based on the results, the HDC cast ingots possess lower oxide and gas concentrations, which can be traced back to the differences in the melt preparation and casting technologies of the ingots. The comparison of the parameters evaluated by image analysis revealed that there is a strong linear relationship between normalized bifilm index and normalized total pore perimeter. The possible sources of error in ingot quality evaluation are highlighted. LA - English DB - MTMT ER - TY - GEN AU - Molnár, Dániel AU - Kéri, Zoltán AU - Erdélyi, János Péter TI - Innovatív alumínium öntészeti technikák PY - 2023 UR - https://m2.mtmt.hu/api/publication/33748835 ID - 33748835 LA - Hungarian DB - MTMT ER - TY - CONF AU - Kéri, Zoltán TI - Porozitás mennyiség csökkentése lap alakú nyomásos öntvény esetén T2 - XXIV. Nemzetközi Bányászati, Kohászati és Földtani Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár PY - 2023 SP - 29 EP - 33 PG - 5 UR - https://m2.mtmt.hu/api/publication/33732273 ID - 33732273 LA - Hungarian DB - MTMT ER - TY - CONF AU - Hudák, Henrietta AU - Budavári, Imre AU - Ferenczi, Tibor AU - Kéri, Zoltán TI - 3D nyomtatáshoz használt fémporok alapvizsgálata újrahasználhatóság szempontjából T2 - XXIV. Nemzetközi Bányászati, Kohászati és Földtani Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár PY - 2023 SP - 23 EP - 28 PG - 6 UR - https://m2.mtmt.hu/api/publication/33732265 ID - 33732265 LA - Hungarian DB - MTMT ER - TY - CONF AU - Gyarmati, Gábor AU - Kéri, Zoltán AU - Molnár, Dániel TI - Öntészeti alumínium ötvözet tömbök minőségének ellenőrzése alacsony nyomáson dermedő próbatestekkel T2 - XXIV. Nemzetközi Bányászati, Kohászati és Földtani Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár PY - 2023 SP - 17 EP - 22 PG - 6 UR - https://m2.mtmt.hu/api/publication/33732232 ID - 33732232 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Gyarmati, Gábor AU - Kéri, Zoltán AU - Molnár, Dániel ED - Homolya, Márton ED - Mankovits, Tamás TI - Analysis of the Quality of Incoming Aluminum Alloy Ingots T2 - 8th International Scientific Conference on Advances in Mechanical Engineering (ISCAME 2022) PB - Department of Mechanical Engineering, Faculty of Engineering, University of Debrecen CY - Debrecen SN - 9789634904489 PY - 2022 SP - 36 EP - 37 PG - 2 UR - https://m2.mtmt.hu/api/publication/33572949 ID - 33572949 LA - English DB - MTMT ER - TY - JOUR AU - Gyarmati, Gábor AU - Bogoly, Levente AU - Stawarz, Marcin AU - Fegyverneki, György AU - Kéri, Zoltán AU - Tokár, Mónika AU - Mende, Tamás TI - Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys JF - MATERIALS J2 - MATERIALS VL - 15 PY - 2022 IS - 21 PG - 23 SN - 1996-1944 DO - 10.3390/ma15217679 UR - https://m2.mtmt.hu/api/publication/33202136 ID - 33202136 AB - 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. LA - English DB - MTMT ER - TY - CONF AU - Gyarmati, Gábor AU - Fanni, Vincze AU - Kéri, Zoltán AU - Fegyverneki, György AU - Molnár, Dániel TI - The Formation of Entrainment Defects during Rotary Degassing Treatments with Different Purging Gases T2 - 10th International Aluminium Symposium PY - 2022 SP - 198 EP - 205 PG - 8 UR - https://m2.mtmt.hu/api/publication/32772209 ID - 32772209 LA - English DB - MTMT ER - TY - JOUR AU - Gyarmati, Gábor AU - Vincze, Fanni AU - Fegyverneki, György AU - Kéri, Zoltán AU - Mende, Tamás AU - Molnár, Dániel TI - The Effect of Rotary Degassing Treatments with Different Purging Gases on the Double Oxide- and Nitride Film Content of Liquid Aluminum Alloys JF - METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE J2 - METALL MATER TRANS B VL - 53 PY - 2022 IS - 2 SP - 1244 EP - 1257 PG - 14 SN - 1073-5615 DO - 10.1007/s11663-021-02414-0 UR - https://m2.mtmt.hu/api/publication/32738858 ID - 32738858 N1 - 32599294 másolata. LA - English DB - MTMT ER -