Effect of hydrogen exposure on mechanical and tribological behavior of CrxN coatings deposited at different pressures on IN718

Aleksei Obrosov, Alina N. Sutygina, Alex A. Volinsky, Anton Manakhov, Sabine Weiß, Egor B. Kashkarov

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In the current study, the properties of the CrxN coatings deposited on the Inconel 718 superalloy using direct current reactive magnetron sputtering are investigated. The influence of working pressure on the microstructure, mechanical, and tribological properties of the CrxN coatings before and after high-temperature hydrogen exposure is studied. The cross-sectional scanning electron micrographs indicate the columnar structure of the coatings, which changes from dense and compact columns to large columns with increasing working pressure. The Cr/N ratio increases from 1.4 to 1.9 with increasing working pressure from 300 to 900 mPa, respectively. X-ray diffraction analysis reveals a change from mixed hcp-Cr2N and fcc-CrN structure to approximately stoichiometric Cr2N phase. After gas-phase hydrogenation, the coating deposited at 300 mPa exhibits the lowest hydrogen absorption at 600 °C of all investigated coatings. The results indicate that the dense mixed cubic and hexagonal structure is preferential for hydrogen permeation resistance due to the presence of cubic phase with higher packing density in comparison to the hexagonal structure. After hydrogenation, no changes in phase composition were observed; however, a small amount of hydrogen is accumulated in the coatings. An increase of coating hardness and elastic modulus was observed after hydrogen exposure. Tribological tests reveal that hydrogenation leads to a decrease of the friction coefficient up to 20%-30%. The best value of 0.25 was reached for hydrogen exposed CrxN coating deposited at 300 mPa.

Original languageEnglish
Article number563
JournalMaterials
Volume10
Issue number5
DOIs
Publication statusPublished - 20 May 2017

Fingerprint

Hydrogen
Coatings
Hydrogenation
Reactive sputtering
Superalloys
Phase composition
Permeation
Magnetron sputtering
X ray diffraction analysis
Elastic moduli
Gases
Hardness
Friction
Scanning
Microstructure
Electrons

Keywords

  • CrN coatings
  • GDOES
  • Hydrogenation
  • Mechanical properties
  • PVD
  • Tribology

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Effect of hydrogen exposure on mechanical and tribological behavior of CrxN coatings deposited at different pressures on IN718. / Obrosov, Aleksei; Sutygina, Alina N.; Volinsky, Alex A.; Manakhov, Anton; Weiß, Sabine; Kashkarov, Egor B.

In: Materials, Vol. 10, No. 5, 563, 20.05.2017.

Research output: Contribution to journalArticle

Obrosov, Aleksei ; Sutygina, Alina N. ; Volinsky, Alex A. ; Manakhov, Anton ; Weiß, Sabine ; Kashkarov, Egor B. / Effect of hydrogen exposure on mechanical and tribological behavior of CrxN coatings deposited at different pressures on IN718. In: Materials. 2017 ; Vol. 10, No. 5.
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