On Improvement of Erosion Resistance of Titanium Parts Fabricated by 3D Printing Using DLC Coating
A.F. Mednikov1, A.B. Tkhabisimov2, S.V. Sidorov3, O.S. Zilova4, A.A. Burmistrov5

1A.F. Mednikov, National Research university MPEI, Moscow, Russia.
2A.B. Tkhabisimov, National Research University MPEI, Moscow, Russia.
3S.V. Sidorov, National Research University MPEI, Moscow, Russia.
4O.S. Zilova, National Research University MPEI, Moscow, Russia.
5A.A. Burmistrov, National Research Rniversity MPEI, Moscow, Russia.

Manuscript received on 01 May 2019 | Revised Manuscript received on 15 May 2019 | Manuscript published on 30 May 2019 | PP: 2385-2390 | Volume-8 Issue-7, May 2019 | Retrieval Number: G5955058719/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: This article discusses experimental studies of resistance against water droplet impact erosion of Ti–6Al–4V samples fabricated by 3D printing without and with protecting DLC (Diamond–Like–Carbon) coating produced by magnetron sputtering. Erosion tests have been carried out using unique test facilities: Erosion–M hydroimpact test rig, Moscow Power Engineering Institute, at impingement velocity of Cimp = 300 m/s with monodisperse flow of liquid and droplet diameter of ddr = 800 µm. The data on properties of DLC coating (elemental composition, thickness, microhardness) are given, the coatings have been formed on field samples: erosion resistant couplings made by 3D printing and simulating leading edge at periphery of rotating blades of the last stage of high-power steam turbine. The experimental and metallographic studies revealed efficiency of ion plasma DLC coatings, their application at the stage of incubation period would improve the erosion resistance of Ti–6Al–4V titanium alloy obtained using additive process by at least 1.4 times. On the basis of the obtained data, possibility of integrated application of 3D printing for fabrication of replaceable erosion resistant couplings with protecting coating on rotating blade periphery has been considered as an alternative to stellite plates widely applied as passive protection against water droplet impact erosion
Keyword: 3D printing, DLC Coating, Experimental Studies, Metallography, Replaceable Couplings, Rotating Blades, Steam Turbine, Water Droplet Impact Erosion.
Scope of the Article: 3D Printing