TY - GEN A1 - Ginzburg, Svetlana A1 - Morozova, Iuliia A1 - Kloshek, Alexander A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin A1 - Bobrynina, Elizaveta A1 - Koltsova, Tatiana S. A1 - Tolochko, Oleg V. A1 - Koçak, Mustafa A1 - Ozbek, Sunullah A1 - Morozova, Iuliia T1 - Addition of nanoparticles to flux cored wires for the nucleation of acicular ferrite microstructure in weld metals of the high-strength low-alloy steel T2 - Welding and Cutting N2 - For the reliability of many welded structures like pipelines or offshore wind parks, it is necessary to ensure high mechanical properties such as strength and toughness of the entire material. In order to improve quality of weld joints, flux cored rods and wires containing different nanoparticles (ZrO2, LaB6 and Al2O3) were manufactured and welded with the TIG and MAG welding processes. Influence of these nanoparticles on the microstructure and mechanical properties of the weld joints were investigated. The acicular ferrite and improved strength of the weld metals were observed by the addition of 0.2 wt.% of iron powder with ZrO2 nanoparticles to the filling of flux cored wires. Y1 - 2020 SN - 1612-3433 VL - 19 IS - 1 SP - 48 EP - 53 ER - TY - GEN A1 - Kondratyev, Alex A1 - Morozova, Iuliia A1 - Golubev, Iurii A1 - Hantelmann, Cord A1 - Naumov, Alexander A1 - Michailov, Vesselin T1 - Микроструктура и механические свойства швов после различных режимов импульсной сварки Al – Mg – Si сплавов трением с перемешиванием T1 - Untersuchung von Mikrostruktur und mechanischen Eigenschaften der Al-Mg-Si Legierungen beim Impuls-Rührreibschweißen mit unterschiedlichen Schweißparametern T2 - Metallovedenie i termicheskaya obrabotka metallov N2 - Welded joints of aluminum alloy 6082-T6 formed by the method of pulse friction stir welding are studied. The effect of the power and frequency of the pulses on the microstructure and mechanical properties of the welded joints is determined. Application of an additional pulse during the welding affects the surface quality and the shape of the weld, the distribution of the oxide layer and of particles of the hardening phase, and the grain size in the zone of dynamic recrystallization. KW - pulse friction stir welding KW - power and frequency of pulses KW - microstructure KW - mechanical properties KW - Al – Mg – Si alloy Y1 - 2017 SN - 0026-0819 IS - 11 SP - 25 EP - 30 ER - TY - CHAP A1 - Golubev, Iurii A1 - Morozova, Iuliia A1 - Naumov, Anton A1 - Hantelmann, Cord A1 - Doynov, Nikolay A1 - Michailov, Vesselin T1 - Numerical simulation and experimental investigation on Numerical simulation of 6082-T6 aluminum alloy T2 - Materials Science and Technology 2017, (MS&T17), Pittsburgh, Pennsylvania, USA, October 8-12, 2017, volume 2 N2 - The series of impulse friction stir welding (IFSW) experiments for aluminum alloy 6082-T6 butt joints was performed to obtain micrographs, tensile and hardness test samples and to receive the validation data for a numerical model of the process. Impulse force and frequency were varied to determine the effect of individual process parameters on microstructure evolution and mechanical properties of the welded butt joints. A three-dimensional model was established to simulate temperature distribution, heat generation and contact state between the tool and the workpiece during IFSW. Based on the numerical simulation, the influence of the impulses on heat input, maximum weld temperatures and contact state was found. The combination of impulse force and frequency effected the grain refinement. The influence of impulses on the elongation and hardness of the welded joints during IFSW were determined. KW - Aluminum alloy KW - Numerical simulation Y1 - 2017 SN - 978-1-5108-5058-3 SP - 987 EP - 994 PB - Curran Associates, Inc. CY - Red Hook, NY ER - TY - GEN A1 - Kondrat’ev, Sergey A1 - Morozova, Iuliia A1 - Golubev, Iurii A1 - Hantelmann, Cord A1 - Naumov, Alexander A1 - Michailov, Vesselin T1 - Microstructure and Mechanical Properties of Welds of Al – Mg – Si Alloys After Different Modes of Impulse Friction Stir Welding T2 - Metal Science and Heat Treatment N2 - Welded joints of aluminum alloy 6082-T6 formed by the method of impulse friction stir welding are studied. The effect of the power and frequency of the pulses on the microstructure and mechanical properties of the welded joints is determined. Application of an additional pulse during the welding affects the surface quality and the shape of the weld, the distribution of the oxide layer and of particles of the hardening phase, and the grain size in the zone of dynamic recrystallization. KW - impulse friction stir welding KW - power and frequency of pulses KW - microstructure KW - mechanical properties KW - Al – Mg – Si alloy Y1 - 2018 UR - https://link.springer.com/article/10.1007%2Fs11041-018-0213-6 U6 - https://doi.org/10.1007/s11041-018-0213-6 SN - 0026-0673 VL - 59 IS - 11-12 SP - 697 EP - 702 ER - TY - CHAP A1 - Ginzburg, Svetlana A1 - Morozova, Iuliia A1 - Kloshek, Alexander A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Schweißen von Stahl mit Nanopartikel modifizierten Fülldrähten - Schweißnahtgefüge und -eigenschaften T2 - DVS Congress 2018 : Große Schweißtechnische Tagung, DVS-Studentenkongress, Vorträge der Veranstaltungen in Friedrichshafen am 17. und 18. September 2018 N2 - Analyse des Schweißnahtgefüges und -eigenschaften beim Schweißen von Stahl mit Nanopartikel modifizierten Fülldrähten KW - Schweißen KW - Fülldraht KW - Nano KW - Nanotechnologie KW - Stahl KW - Gefüge Y1 - 2018 SN - 978-3-96144-036-8 SP - 40 EP - 46 PB - DVS Media GmbH CY - Düsseldorf ER - TY - GEN A1 - Naumov, Anton A1 - Morozova, Iuliia A1 - Rylkov, Evgenii A1 - Obrosov, Aleksei A1 - Isupov, Fedor A1 - Michailov, Vesselin A1 - Rudskoy, Andrey I. T1 - Metallurgical and Mechanical Characterization of High-Speed Friction Stir Welded AA 6082-T6 Aluminum Alloy T2 - Materials N2 - The objective of this study was to investigate the effect of the high welding speed on the mechanical properties and their relations to microstructural characteristics of butt friction stir welded joints with the use of 6082-T6 aluminum alloy. The aluminum sheets of 2.0 mm thick were friction stir welded at low (conventional FSW) and high welding speeds (HSFSW) of 200 and 2500 mm/min, respectively. The grain size in the nugget zone (NZ) was decreased; the width of the softened region was narrowed down as well as the lowest microhardness value located in the heat-affected zone (HAZ) was enhanced by HSFSW. The increasing welding speed resulted in the higher ultimate tensile strength and lower elongation, but it had a slight influence on the yield strength. The differences in mechanical properties were explained by analysis of microstructural changes and tensile fracture surfaces of the welded joints, supported by the results of the numerical simulation of the temperature distribution and material flow. The fracture of the conventional FSW joint occurred in the HAZ, the weakest weld region, while all HSFSW joints raptured in the NZ. This demonstrated that both structural characteristics and microhardness distribution influenced the actual fracture locations. KW - high-speed friction stir welding (HSFSW) KW - aluminum alloy KW - remnant oxide line (ROL) KW - microstructural characteristics KW - mechanical properties KW - fracture behavior KW - FEM Y1 - 2019 UR - https://www.mdpi.com/1996-1944/12/24/4211 U6 - https://doi.org/10.3390/ma12244211 SN - 1996-1944 VL - 12 IS - 24 ER - TY - GEN A1 - Morozova, Iuliia A1 - Bonnel, Jean-Marie A1 - Rosert, Reinhard A1 - Ossenbrink, Ralf A1 - Michailov, Vesselin T1 - Einfluss der Schweißposition beim MSG-Fülldrahtschweißen auf die Kerbschlagzähigkeit von hoch- und niedriglegierten Stählen T2 - DVS Congress 2019Große Schweißtechnische Tagung : DVS-Studentenkongress : Vorträge der Veranstaltungen in Düsseldorf vom 16. bis 17. September 2019 N2 - Die Schweißposition beeinflusst erheblich die mechanischen Eigenschaften der Schweißnaht, insbesondere die Kerbschlagzähigkeit. Dies zeigt ein umfassender Vergleich der mechanischen Eigenschaften von Schweißgütern, die in der Steigposition (PF) und Wannenlage (PA) ausgeführt wurden. Schweißgüter von Kohlenstoff-Mangan-Stählen weisen in der PF-Position eine reduzierte Kerbschlagarbeit im Vergleich zur PA-Position auf. Dagegen ist bei austenitischen und Duplexstählen der Einfluss der Schweißposition auf die Kerbschlagarbeit genau entgegengesetzt. Der Vortrag fasst den Einfluss der Schweißpositionen auf die mechanischen Eigenschaften zusammen und liefert eine Erklärung für die gegensätzlichen Auswirkungen auf die Kerbschlagzähigkeit der Schweißgüter. Der Schwerpunkt liegt dabei auf hochlegierten Fülldrähten mit einer schnell erstarrenden Schlacke. Die Schlackeneigenschaften, Schweißgutmikrostruktur, Delta-Ferrit-Gehalte für Schweißgüter vom Typ Duplexstahl (2209) und von austenitischen Schweißgütern (308L) sowie die Auswirkungen der Schweißposition auf die Richtung des Schweißkornwachstums werden erläutert. Zum Vergleich werden Kohlenstoff-Mangan-Rutil-Fülldrähte mit schnell erstarrender Schlacke herangezogen. Y1 - 2019 UR - https://www.gbv.de/dms/tib-ub-hannover/1067034390.pdf SN - 978-3-96144-066-5 SP - 310 EP - 318 PB - DVS Media GmbH CY - Düsseldorf ER - TY - GEN A1 - Naumov, Anton A1 - Isupov, Fedor A1 - Golubev, Iurii A1 - Morozova, Iuliia T1 - Effect of the temperature of friction stir welding on the microstructure and mechanical properties of welded joints of an Al-Cu-Mg alloy T2 - Metal Science and Heat Treatment N2 - Amethod for assessing the effect of the temperature of friction stir welding on the microstructure and mechanical properties of welded joints of aluminum alloy D16AT is suggested. The temperature cycles in different zones of a welded joint are determined by mathematical simulation. The computed temperature cycles are implemented in a Gleeble-3800 system. It is shown that the welding temperature affects little the evolution of the microstructure in different zones of the welded joints of alloy D16AT. Y1 - 2019 U6 - https://doi.org/10.1007/s11041-019-00342-0 SN - 1573-8973 SN - 0026-0673 VL - 60 SP - 695 EP - 700 ER - TY - GEN A1 - Naumov, Anton A1 - Morozova, Iuliia A1 - Isupov, Fedor A1 - Golubev, Iurii A1 - Michailov, Vesselin T1 - Temperature Influence on Microstructure and Properties Evolution of Friction Stir Welded Al-Mg-Si Alloy T2 - Key Engineering Materials N2 - The temperature influence on the microstructure evolution and microhardness of the agehardenable aluminium alloy 6082 T6 during friction stir welding was defined. In order to achieve this aim, the thermocycles calculated using the developed 3D Finite Element Model were physically simulated on the Gleeble-3800 in the points which located in the different zones of the weld. The microstructure in the chosen points after Gleeble testing was investigated as well as the microhardness was measured. The results were consequently compared with the relevant results obtained after friction stir welding. It was shown that the microstructure and microhardness profile are influenced not only by temperature but by deformation. The increase in hardness in different zones after FSW compared to Gleeble testing can be explained by the grain refinement in the nugget zone as well as the hardening precipitate distribution along the weld which can occur more rapidly due to the deformation influence. Y1 - 2019 U6 - https://doi.org/10.4028/www.scientific.net/KEM.822.122 SN - 1662-9795 VL - 822 SP - 122 EP - 128 ER - TY - GEN A1 - Naumov, Anton A1 - Isupov, Fedor A1 - Golubev, Iurii A1 - Morozova, Iuliia A1 - Spree, Cornelius T1 - Development of Methodology to Determine the Temperature Influence on Microstructure Evolution during Friction Stir Welding T2 - Papers from Materials Science and Technology 2018 (MS&T18), October 14–18, 2018, Greater Columbus Convention Center, Columbus, Ohio, USA Y1 - 2018 UR - https://www.researchgate.net/publication/328772948_DEVELOPMENT_OF_METHODOLOGY_TO_DETERMINE_THE_TEMPERATURE_INFLUENCE_ON_MICROSTRUCTURE_EVOLUTION_DURING_FRICTION_STIR_WELDING U6 - https://doi.org/10.7449/2018mst/2018/mst_2018_795_802 ER -