Search academic texts

Information × Registration Number 0216U003857, 0112U008364 , R & D reports Title Optimization of parameters of use of tools of superhard materials for welding and homogenization of nonferrous metals and alloys by friction with stirring. popup.stage_title Head Maystrenko Anatoliy Lvovich, Доктор технічних наук Registration Date 22-02-2016 Organization V.Bakul Institute for Superhard Materials popup.description2 Developed design tools and the method of deposition process or modifying the structure of metals and alloys by friction with stirring, which provide reliable connection welded layers of constant depth or modifying the structure of the surface layers of the product; - The instruments used for the deposition of nickel on copper basis crystallizer of SCCM, as well as for the treatment of the surface layers of magnesium alloys ML10, MA2 and aluminum alloys 7010, 7075-T6 friction with stirring for the purpose of modifying the structure aimed at developing treatment zone fine grain structure of the alloy (size grain 1,2-4,5 mm) that grain size of 16 - 63 times smaller than the weekend (75.8 microns); - Determined that formation for maximum friction modified constant depth of mixing of the surface layer of metals and alloys, tools of different sizes, the step size scan tool tsk in the surface layer of metal products is recommended to be tsk = D (D - diameter at the pin base); - Experimental measurement of the distribution of temperature field in the zone modifications ML10 and 7075 alloys and nickel FSW copper. Measurements were performed using an infrared thermal imager Fluke-ir25 and digital non-contact infrared thermometer DT-8833. Determined that the maximum heating temperature of the alloy in the area of ??contact interaction tool with the treated layers TA samples studied alloys reached 340-3800S corresponding to the known conditions of maximum temperature at ZTP (0.4-0.5) Tm; - Experimental measurement components of the friction force with stirring performed on developed stand equipped with automated information-measuring system. Measure the vertical and horizontal components of the force on the tool in FSW nickel copper by changing the kinematic parameters of motion of the tool at the time showed that with the change of the rate of flow instrument from 25 to 50 mm / min value of the vertical component force increases from 7 to 12 kN and the horizontal component, on the contrary, decreased from 0.9 to 0.5 kN; - For the first time the method diffraction reflected electrons in scanning electron microscope ZEISS EVO, equipped energodispersive analyzer INCA PENTA Feth3 The crystallites state in deformed zones FSW and articles made of magnesium and aluminum alloys; - First determined that when modified by FSW layers of samples ML10 alloy between the recrystallization zone through a liquid phase FSW seam metal grain size of the alloy in 8.7 times smaller than the base metal (75.8 microns), that is the size of 9,3-9, 8 microns, is a zone modified TA fine-grained structure with grain sizes in the 11.6 times smaller than the weekend, i.e. - 6.4 microns, which is 1.5 times smaller than a grain ZTMV (recrystallization-zone 7.8 m); for the first time determined that the average grain size in the layer modification TP (1,2-4,5 mm grain size), during its heating and cooling zones of recrystallization FSW metal in the area, the average grain size in this area increased to 6.4 m; - For the first time shows the formation of cracks in the border zone recrystallization coupling through the liquid phase FSW metal weld and base metal magnesium alloy ML10 and their lack of welding through an intermediate zone modified fine structure, making it possible to increase the strength of welded joints FSW alloy ML10; - Completed microchemical analysis of the constituent elements of the base metal products, modified layer and FSW seam shown that they coincide with the starting composition, i.e. processes modifying friction with stirring and FSW will not affect the change in the distribution of content components but significantly affect the change in grain size and redistribution of residual thermal stress; - Analysis of the impact of kinetic parameters of the instrument to change the microstructure of modified surface layers of products and welded joints obtained by electron-beam welding. The recommendations for the implementation of the process of friction with stirring repair and Recover Technology products from aluminum and magnesium alloys in aircraft manufacturing; - The optimal settings for the modification of the surface layers of magnesium and aluminum alloys with stirring friction (TP) is defined based on the criteria of maximum thickness of the formation of the intermediate zone ZTMV. For magnesium alloy ML10 is consistent feed rate instrument - 31,5-40 mm / min and spindle rotation frequency - 630 min -1, which also provide continuity layer delaminations and lack FSW treated layer of the base metal products; - On the basis of the analysis of influence of kinetic parameters of the instrument to change the microstructure of modified surface layers of products and welded joints obtained by electron-beam welding, recommendations on the implementation process of friction with stirring in repair and Recover Technology products from aluminum and magnesium alloys in aircraft production. Using friction with stirring recovery technology developed parts aviation technology of magnesium alloy ML10 which have defects such as cracks and cavities. Product Description popup.authors Беженар Микола Павлович Беспалов Сергій Федорович Болотгова Лариса Михайлівна Вировець Люс'єн Миколайович Гордієнко Ольга Йосипівна Дутка Василь Ананійович Заболотний Сергій Дмитрович Кущ Володимир Іванович. Лукаш Володимир Андрійович Майстренко Анатолій Львович Подоба Ярослав Олександрович Прокопів Микола Михайлович Смекаленков Сергій Вікторович Ткач Василь Миколайович Харченко Олег popup.nrat_date 2020-04-02 Close