@inproceedings{NaumovChenikovGolubevetal., author = {Naumov, Anton and Chenikov, Evgenii V. and Golubev, Iurii and Michailov, Vesselin}, title = {Numerical simulation and microstructure analysis of friction stir welded Al 6082}, series = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, booktitle = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-62-8}, language = {en} } @misc{KondratyevMorozovaGolubevetal., author = {Kondratyev, Alex and Morozova, Iuliia and Golubev, Iurii and Hantelmann, Cord and Naumov, Alexander and Michailov, Vesselin}, title = {Микроструктура и механические свойства швов после различных режимов импульсной сварки Al - Mg - Si сплавов трением с перемешиванием}, series = {Metallovedenie i termicheskaya obrabotka metallov}, journal = {Metallovedenie i termicheskaya obrabotka metallov}, number = {11}, issn = {0026-0819}, pages = {25 -- 30}, abstract = {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.}, language = {ru} } @misc{Kondrat’evMorozovaGolubevetal., author = {Kondrat'ev, Sergey and Morozova, Iuliia and Golubev, Iurii and Hantelmann, Cord and Naumov, Alexander and Michailov, Vesselin}, title = {Microstructure and Mechanical Properties of Welds of Al - Mg - Si Alloys After Different Modes of Impulse Friction Stir Welding}, series = {Metal Science and Heat Treatment}, volume = {59}, journal = {Metal Science and Heat Treatment}, number = {11-12}, issn = {0026-0673}, doi = {10.1007/s11041-018-0213-6}, pages = {697 -- 702}, abstract = {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.}, language = {en} } @misc{NaumovIsupovGolubevetal., author = {Naumov, Anton and Isupov, Fedor and Golubev, Iurii and Morozova, Iuliia and Spree, Cornelius}, title = {Development of Methodology to Determine the Temperature Influence on Microstructure Evolution during Friction Stir Welding}, series = {Papers from Materials Science and Technology 2018 (MS\&T18), October 14-18, 2018, Greater Columbus Convention Center, Columbus, Ohio, USA}, journal = {Papers from Materials Science and Technology 2018 (MS\&T18), October 14-18, 2018, Greater Columbus Convention Center, Columbus, Ohio, USA}, doi = {10.7449/2018mst/2018/mst_2018_795_802}, pages = {8}, language = {en} } @misc{MorozovaObrosovNaumovetal., author = {Morozova, Iuliia and Obrosov, Aleksei and Naumov, Anton and Kr{\´o}licka, Aleksandra and Golubev, Iurii and Bokov, Dmitry O. and Doynov, Nikolay and Weiß, Sabine and Michailov, Vesselin}, title = {Impact of Impulses on Microstructural Evolution and Mechanical Performance of Al-Mg-Si Alloy Joined by Impulse Friction Stir Welding}, series = {Materials}, volume = {14}, journal = {Materials}, number = {2}, issn = {1996-1944}, doi = {https://doi.org/10.3390/ma14020347}, abstract = {Impulse Friction Stir Welding (IFSW) was utilized to join 6082-T6 alloy plates at various impulse frequencies. A distinctive feature of IFSW is the generation of mechanical impulses that enhances the forging action of the tool, and thereby, alters the weld microstructure. The microstructural evolution in the Stir Zone (SZ) with special focus on the strengthening precipitation behavior, and overall mechanical properties of the IFSW joints have been investigated. It was demonstrated that the strengthening β″ precipitates reprecipitated in the SZ of the IFSW joints during natural aging. In contrast, no precipitates were found in the SZ of the Friction Stir Welding (FSW) weld. Partial reversion of β″ after IFSW is supposed to occur due to more developed subgrain network and higher dislocation density introduced by impulses that accelerated precipitation kinetics. Dynamic recrystallisation was facilitated by impulses resulting in a fine, homogeneous structure. There was no significant difference between the microhardness in the SZ, tensile and yield strength of the FSW and IFSW joints. However, the application of impulses demonstrated the smoothing of the hardness reduction in the transition region at the advancing side. The shift of the fracture location from the Heat-Affected Zone (HAZ) by FSW to the SZ as well as higher elongation of the joints by IFSW of lower frequencies could be related to the grain refinement and the change of the grain orientation.}, language = {en} } @inproceedings{GolubevMorozovaNaumovetal., author = {Golubev, Iurii and Morozova, Iuliia and Naumov, Anton and Hantelmann, Cord and Doynov, Nikolay and Michailov, Vesselin}, title = {Numerical simulation and experimental investigation on Numerical simulation of 6082-T6 aluminum alloy}, series = {Materials Science and Technology 2017, (MS\&T17), Pittsburgh, Pennsylvania, USA, October 8-12, 2017, volume 2}, booktitle = {Materials Science and Technology 2017, (MS\&T17), Pittsburgh, Pennsylvania, USA, October 8-12, 2017, volume 2}, publisher = {Curran Associates, Inc.}, address = {Red Hook, NY}, isbn = {978-1-5108-5058-3}, pages = {987 -- 994}, abstract = {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.}, language = {en} } @inproceedings{GolubevNaumovMichailov, author = {Golubev, Iurii and Naumov, Anton and Michailov, Vesselin}, title = {Developing finite element model of the friction stir welding for temperature calculation}, series = {METAL 2014, International Conference on Metallurgy and Materials, May 21 st - 23rd 2014, Brno}, booktitle = {METAL 2014, International Conference on Metallurgy and Materials, May 21 st - 23rd 2014, Brno}, isbn = {978-80-87294-54-3}, pages = {1242 -- 1248}, language = {en} } @inproceedings{NaumovChenikovGolubevetal., author = {Naumov, Anton and Chenikov, Evgenii V. and Golubev, Iurii and Michailov, Vesselin}, title = {Research of temperature distribution during friction stir welding of 2 mm Aw 6082 sheets}, series = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, booktitle = {METAL 2015, 24th International Conference on Metallurgy and Materials, conference proceedings, June 3rd-5th 2015, Brno}, publisher = {Tanger}, address = {Ostrava}, isbn = {978-80-87294-62-8}, pages = {651 -- 653}, language = {en} } @inproceedings{GolubevNaumovChernikovetal., author = {Golubev, Iurii and Naumov, Anton and Chernikov, Evgenii V. and Michailov, Vesselin}, title = {Temperature distribution and welding distortion measurements after FSW of Al 6082-T6 sheets}, series = {Friction Stir Welding and Processing VIII, 144th Annual Meeting and Exhibition, 15.03.2015, Orlando}, booktitle = {Friction Stir Welding and Processing VIII, 144th Annual Meeting and Exhibition, 15.03.2015, Orlando}, editor = {Mishra, Rajiv S. and Mahoney, Murray W. and Sato, Yutaka and Hovanski, Yuri}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-48604-8}, doi = {10.1007/978-3-319-48173-9}, pages = {289 -- 295}, language = {en} } @incollection{GolubevDoynovHantelmannetal., author = {Golubev, Iurii and Doynov, Nikolay and Hantelmann, Cord and Michailov, Vesselin}, title = {W{\"a}rmequellemodell und FE-Temperaturfeldsimulation f{\"u}r das R{\"u}hrreibschweißen}, series = {DVS Congress 2017 : Große Schweißtechnische Tagung : DVS-Studentenkongress : Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, booktitle = {DVS Congress 2017 : Große Schweißtechnische Tagung : DVS-Studentenkongress : Vortr{\"a}ge der Veranstaltungen in D{\"u}sseldorf vom 26. bis 29. September 2017}, publisher = {DVS Media}, address = {D{\"u}sseldorf}, isbn = {978-3-96144-008-5}, pages = {112}, language = {de} } @misc{NaumovMorozovaIsupovetal., author = {Naumov, Anton and Morozova, Iuliia and Isupov, Fedor and Golubev, Iurii and Michailov, Vesselin}, title = {Temperature Influence on Microstructure and Properties Evolution of Friction Stir Welded Al-Mg-Si Alloy}, series = {Key Engineering Materials}, volume = {822}, journal = {Key Engineering Materials}, issn = {1662-9795}, doi = {10.4028/www.scientific.net/KEM.822.122}, pages = {122 -- 128}, abstract = {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.}, language = {en} } @misc{NaumovIsupovGolubevetal., author = {Naumov, Anton and Isupov, Fedor and Golubev, Iurii and Morozova, Iuliia}, title = {Effect of the temperature of friction stir welding on the microstructure and mechanical properties of welded joints of an Al-Cu-Mg alloy}, series = {Metal Science and Heat Treatment}, volume = {60}, journal = {Metal Science and Heat Treatment}, issn = {1573-8973}, doi = {10.1007/s11041-019-00342-0}, pages = {695 -- 700}, abstract = {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.}, language = {en} } @misc{GolubevMorozovaNaumovetal., author = {Golubev, Iurii and Morozova, Iuliia and Naumov, Anton and Hantelmann, Cord and Doynov, Nikolay and Michailov, Vesselin}, title = {Numerical Simulation and Experimental Investigation on Impulse Friction Stir Welding of 6082-T6 Aluminum Alloy}, series = {Papers from Materials Science and Technology 2017 (MS\&T17), October 8 - 12, 2017, David L. Lawrence Convention Center, Pittsburgh, Pennsylvania USA}, journal = {Papers from Materials Science and Technology 2017 (MS\&T17), October 8 - 12, 2017, David L. Lawrence Convention Center, Pittsburgh, Pennsylvania USA}, doi = {10.7449/2017/mst_2017_987_994}, pages = {987 -- 994}, abstract = {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.}, language = {en} }