Effect of nitriding on the structure of the surface layers and properties of titanium alloys AT3 and AT6

Борискина, Н. Г.; Shashkov, D. P.; Kenina, E. M.; Mikhalin, V. M.

doi:10.1007/bf00704992

Cited by 12 publications

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“…The tetragonal Ti 2 N phase was not detected by XRD for all samples, which contradicts some results from the literature. [23][24][25] Despite the high purity of the nitrogen gas (99 . 998%), the tetragonal TiO 2 phase was detected for all samples in the compound layer, which largely consists of TiN.…”

Section: Phase Compositionmentioning

confidence: 99%

Microstructure and microhardness of gas nitrided surface layers in Ti–8Al–1Mo–1V and Ti–10V–2Fe–3Al alloys

Zhecheva¹,

Malinov²,

Sha³

2005

Surface Engineering

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Two different types of titanium alloy, near a Ti-8Al-1Mo-1V and near b Ti-10V-2Fe-3Al, were studied in this work. They were thermochemically treated in a pure nitrogen atmosphere in order to improve their surface properties. The nitriding was performed at two different temperatures, 950uC and 1050uC, and for three different periods of time, 1, 3 and 5 h. Nitrided layers were formed during the process with a thickness from 100 to 350 mm, depending on the processing temperature and time, for both alloys. Their microstructural characteristics and phase composition were studied using optical microscopy and X-ray diffraction. X-ray analyses indicated that new phases a-Ti(N), TiN and TiO 2 were formed during the process of nitriding. The lattice parameters a and c of the a phase and residual surface stress were obtained. The surface hardness was measured for all the samples. Microhardness profiles were obtained on cross-sections of the samples by applying a Knoop indenter. The surface hardness increases with increases in the temperature and duration of nitriding. The maximum values of the microhardness (HK0 . 05) varied between 550 and 820 for Ti-8Al-1Mo-1V. For Ti-10V-2Fe-3Al, they varied between 520 and 870.

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Section: Phase Compositionmentioning

confidence: 99%