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0216U000792,
0115U004017
,
Increasing fretting resistance of fasteners from VT22 titanium alloy by forming of functional coatings by means of heat treatment
Fedirko Victor,
03-03-2016
Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine
As a result of the project, was developed and proposed technological scheme of surface modification (oxy-nitration) hot heading bolts alloy VT22 combined with aging in a single technological cycle to increase their fretting-resistance and ensure a balance of strength, fatigue, tribological and corrosive characteristics. Shown that the proposed technology surface modification (oxy-nitration) hot heading bolts VT22 alloy, achieves these parameters modified layer, surface hardness 5.2...6.5 GPa hardened zone depth 30 ... 35 mm, film thickness 0.03...0.05 microns. The results of bench tests on "Antonov" experimental party hot heading bolts alloy VT22 found that the destruction bolt was influenced factor sequence of technological operations thread rolling and aging. The mode of chemical heat treatment of VT22 alloy bolts the proposed technological scheme (aging combined with oxy-nitration) regarding to the conditions of production "Antonov" was adapted. The optimization of the oxy-nitriding process gas dynamic parameters such as vacuum depth at the stages of heating to the aging temperature, isothermal exposure and cooling was complete. The technological instruction RTI 16-634-2012 for production hot heading bolts alloy VT-22 was accepted for implementation on "Antonov".
Кравчишин Тарас Миронович
Лук'яненко Олександр Геннадійович
Труш Василь Степанович
2020-04-02
Updated: 2025-12-07
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