TY - CONF AU - Bogoly, Levente AU - Mende, Tamás AU - Fegyverneki, György AU - Gyarmati, Gábor ED - Csüllög, Mihály ED - Mankovits, Tamás TI - The Influence of Different Grain Refining Fluxes and Master Alloy Addition on the Melt Quality of an Aluminum Casting Alloy 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 - 20 UR - https://m2.mtmt.hu/api/publication/34394420 ID - 34394420 LA - English DB - MTMT ER - TY - GEN AU - Bogoly, Levente AU - Mende, Tamás AU - Fegyverneki, György AU - Gyarmati, Gábor TI - Különböző szemcsefinomító sókeverékek és előötvözet adagolás olvadékminőségre gyakorolt hatásának vizsgálata PY - 2023 UR - https://m2.mtmt.hu/api/publication/34198938 ID - 34198938 N1 - Konferencia előadás LA - Hungarian DB - MTMT ER - TY - CONF AU - Gyarmati, Gábor AU - Mende, Tamás TI - The Interactions of Grain Refiner Particles and Double Oxide Films in Liquid Aluminum Alloys T2 - Proceedings of the 63rd IFC Portoroz 2023 SN - 9789619479377 PY - 2023 SP - 74 UR - https://m2.mtmt.hu/api/publication/34144450 ID - 34144450 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 - CONF AU - Bogoly, Levente AU - Mende, Tamás AU - Fegyverneki, György AU - Gyarmati, Gábor TI - Eltérő kezelősók és Al-5%Ti-1%B előötvözet adagolás olvadékminőségre gyakorolt hatásának vizsgálata Al-7%Si-0,5%Cu-0,4%Mg ötvözet esetén T2 - XXIV. Nemzetközi Bányászati, Kohászati és Földtani Konferencia PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár PY - 2023 SP - 7 EP - 12 PG - 6 UR - https://m2.mtmt.hu/api/publication/33732162 ID - 33732162 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Gyarmati, Gábor AU - Mende, Tamás TI - Evolution of Hydrogen Concentration in a Liquid Aluminum Alloy during the Aided Sedimentation of Double Oxide Films by (Al,Si)3Ti Intermetallic Particles JF - Doktorandusz Almanach J2 - Doktorandusz Almanach VL - 1 PY - 2022 SP - 179 EP - 189 PG - 11 SN - 2939-7294 UR - https://m2.mtmt.hu/api/publication/33330778 ID - 33330778 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 - GEN AU - Gyarmati, Gábor AU - Bogoly, Levente AU - Marcin, Stawarz AU - Fegyverneki, György AU - Tokár, Mónika AU - Mende, Tamás TI - Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys. 62th International Scientific Conference Solidification and Crystallization of Metals 2022. 28-30 September 2022. Gliwice, Poland (online) TS - 62th International Scientific Conference Solidification and Crystallization of Metals 2022. 28-30 September 2022. Gliwice, Poland (online) PY - 2022 UR - https://m2.mtmt.hu/api/publication/33119019 ID - 33119019 LA - English DB - MTMT ER - TY - JOUR AU - Gyarmati, Gábor AU - Bubonyi, Tamás AU - Fegyverneki, György AU - Tokár, Mónika AU - Mende, Tamás TI - Interactions of primary intermetallic compound particles and double oxide films in liquid aluminum alloys JF - INTERMETALLICS J2 - INTERMETALLICS VL - 149 PY - 2022 PG - 13 SN - 0966-9795 DO - 10.1016/j.intermet.2022.107681 UR - https://m2.mtmt.hu/api/publication/33048057 ID - 33048057 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 -