Plasma assisted nitriding of Ni-based superalloys with various microstructures

Chollet, Sébastien; Pichon, L.; Cormier, Jonathan; Dubois, Jean-Baptiste; Villechaise, Patrick; Drouet, M.; Declémy, A.; Templier, C.

doi:10.1016/j.surfcoat.2013.07.060

Cited by 36 publications

(16 citation statements)

References 41 publications

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“…However, some processes, widely used for steels such as case-hardening or diffusion carburizing [5,6], were not appropriate for Ni-based alloys because of the very low solubility of carbon in nickel [7]. While such a surface treatment as boriding [8][9][10][11][12][13][14][15][16][17][18][19], nitriding [20][21][22][23][24][25][26][27][28][29][30] as well as physical and chemical vapor deposition [31][32][33] increased the hardness and wear resistance of the considered superalloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of laser alloying with boron and niobium on microstructure and properties of Nimonic 80A-alloy

Makuch

Piasecki

Dziarski

et al. 2015

Optics & Laser Technology

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Section: Introductionmentioning

confidence: 99%

Influence of laser alloying with boron and niobium on microstructure and properties of Nimonic 80A-alloy

Makuch

Piasecki

Dziarski

et al. 2015

Optics & Laser Technology

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“…Similar swelling dependence on nitriding time it was experimentally obtained in Refs. [41,42], where the swelling thickness and swelling rates have been measured experimentally for nitrided ASS. Moreover the sputtering process takes place during nitriding of CoCr L605 alloy [8].…”

Section: Resultsmentioning

confidence: 99%

Internal stress assisted nitrogen diffusion in plasma nitrided medical CoCr alloys

Galdikas

Petraitienė

Moskaliovienė

2015

Vacuum

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“…The same linear dependency on square root nitriding time is experimentally obtained for stainless steels (Stinville, et. al., 2011;Chollet, et. al., 2013).…”

Section: ) (N Dmentioning

confidence: 99%

The Modeling of Nitrogen Mass Transport in CoCr Alloys

Petraitienė

2016

Rural Sustainability Research

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The kinetics of plasma nitriding of CoCr alloy below temperatures of nitrides formation and mechanisms of nitrogen penetration are analyzed by proposed kinetic modeling in this article. Proposed nitrogen diffusion model is based on the trapping – detrapping (TD) model and developed taking into account the effect of the concentration dependent diffusivity of nitrogen, nitrogen adsorption on the surface of alloy and surface swelling process. The model indicates the influence of chromium atoms to nitrogen atoms diffusivity. The model consists of time and depth dependent diffusion, which is described by a partial differential equation, and it is solved by using Crank – Nicolson finite difference method. By fitting of experimental nitrogen depth profiles, it is shown that nitrogen diffusion coefficient varies with nitrogen concentration according to Einstein-Smoluchowski relation. Nitrogen depth profiles in plasma nitrided medical grade CoCr alloy (ISO 5831 – 12) at T = 400 °C for 1, 4 and 20 hours calculated on the basis of this model are in good agreement with experimental nitrogen profiles. Furthermore, the swelling process is showed and analyzed, derived the dependency of swelling rate on nitriding duration – the swelling rate is inversely proportional to the square root of nitriding duration. The obtained diffusion coefficient value and the swelling process rates satisfy the experimental data form Ref. The derived model explains physical processes during plasma nitriding and allows obtaining nitrogen depth profiles for any requisite nitriding duration.

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Plasma assisted nitriding of Ni-based superalloys with various microstructures

Cited by 36 publications

References 41 publications

Influence of laser alloying with boron and niobium on microstructure and properties of Nimonic 80A-alloy

Influence of laser alloying with boron and niobium on microstructure and properties of Nimonic 80A-alloy

Internal stress assisted nitrogen diffusion in plasma nitrided medical CoCr alloys

The Modeling of Nitrogen Mass Transport in CoCr Alloys

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