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Information × Registration Number 0217U006702, 0117U000713 , R & D reports Title Development of technology combined deformation-diffusion modification of the surface layers of structural elements of aviation engineering from the titanium alloys popup.stage_title Head Lukyanenko Alexander, Кандидат технічних наук Registration Date 27-12-2017 Organization Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine popup.description2 A comparative evaluation of the various structural states of the two-phase VT22 titanium alloy on the susceptibility to deformation (coiling) and Thermodiffusion (nitriding) treatments for effective combination in deformation-diffusion processing is carried out. The influence of the structural factor on the processes of deformation (coiling) treatment of the VT22 titanium alloy is substantiated. It is shown that the optimal complex of physicomechanical characteristics ensures the coiling of the VT22 titanium alloy with (alpha + beta) structure. Obkochuvannya alloy with the beta structure is inefficient. It is established that the microstructure of the alloy with the beta structure after nitriding combined with thermal treatment of the alloy is heterogeneous, which makes it unsuitable for deformation-diffusion treatment. In the two-phase (alpha + beta) lamellar structure, as the nitriding temperature increases, the alpha-phase grains coarsen. Therefore, saturation should be carried out at lower temperatures (<840°C), while increasing the time exposure (from 3 to 6 h). The most suitable for nitriding is the globular (alpha + beta) structure due to its high thermal stability compared to the beta or (alpha + beta) plate structure. To obtain a regulated thickness, a nitride film (<5 mkm) with this structure requires high temperatures (> 840°C) and long isothermal exposures (> 6 h) during nitriding combined with heat treatment of the alloy. Product Description popup.authors Кравчишин Тарас Миронович Лаврись Сергій Мирославович Погрелюк Ірина Миколаївна popup.nrat_date 2020-04-02 Close