Surface roughening of Ti-6A-7Nb alloy plasma nitrided at cathode potential
Authors:
- J. Morgiel,
- Ł. Maj,
- K. Szymkiewicz,
- M. Pomorska,
- P. Ozga,
- D. Toboła,
- M. Tarnowski,
- T. Wierzchoń
Abstract
A plasma nitriding of titanium alloys is very efficient method of their surface hardness and wear resistance improvement without compromising a core strength of the treated elements. The surface roughening increasing with the temperature of this treatment is a major obstacle on the way toward production of the fine quality products. Confronting of the roughness measurements performed at different scales with complementary plan-view surface observations (OM, SEM/SE, FIB/SE, AFM) and cross-section (TEM) ones, focused on description of the surface defects, allowed the mechanism of their development to be explained. Namely, the TiN layer produced at lower temperatures (∼620 °C) grows predominantly with a flat front, roughly reproducing the substrate morphology, while at intermediate and higher temperatures (680 °C−830 °C) it is a subject of severe self-spalling of the upper part of this layer. It means that simultaneous hardening and preservation of a high surface quality of Ti-6Al-7Nb after CP-PN is possible only during the plasma nitriding performed at the temperatures close to 600 °C. Additionally, a strong self-spalling of the upper part of the TiN layer during this treatment at higher temperatures means that only its remaining part, growing toward the core, could eventually serve as a corrosion protection barrier.
- Record ID
- CUT63abd5aaff6e44a0ae0ed7c3e08d3983
- Publication categories
- ;
- Author
- Journal series
- Applied Surface Science, ISSN 0169-4332, e-ISSN 1873-5584
- Issue year
- 2022
- Vol
- 574
- Pages
- [1-12]
- Article number
- 151639
- Other elements of collation
- rys.; wykr.; Bibliografia (na s.) - 11-12; Bibliografia (liczba pozycji) - 35; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 574
- Keywords in English
- titanium alloy, surface roughness, plasma nitriding, TEM
- ASJC Classification
- DOI
- DOI:10.1016/j.apsusc.2021.151639 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S0169433221026866 Opening in a new tab
- Related project
- Efekt synergii mechanicznej obróbki powierzchniowej i niskotemperaturowego azotowania na poprawę wybranych właściwości warstwy wierzchniej stopu Ti6Al4V. . Project leader at PK: , ,
- Language
- eng (en) English
- License
- Score (nominal)
- 140
- Score source
- journalList
- Score
- Publication indicators
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT63abd5aaff6e44a0ae0ed7c3e08d3983/
- URN
urn:pkr-prod:CUT63abd5aaff6e44a0ae0ed7c3e08d3983
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.