Plasma nitriding response at 400 °C of the single crystalline Ni-based superalloy MC2

Plasma nitriding of MC2, a single crystalline (γ/γ′) Ni-based superalloy, was performed at 400 °C for 1 and 4 h. Owing to its monomodal γ′ particle size distribution, MC2 was used as a model material in an attempt to investigate the behavior of precipitates during the nitriding of a γ matrix. The ni...

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Bibliographic Details
Published in:Journal of materials science 2013-02, Vol.48 (4), p.1585-1592
Main Authors: Pichon, L., Cormier, J., Declemy, A., Chollet, S., Villechaise, P., Dubois, J. B., Templier, C.
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Characterization and Evaluation of Materials
Chemical precipitation
Chemistry and Materials Science
Classical Mechanics
Crystal structure
Crystallinity
Crystallography and Scattering Methods
Diffraction
Glow discharges
Ion nitriding
Materials Science
Morphology
Nickel base alloys
Nitrogen
Optical emission spectroscopy
Particle size distribution
Polymer Sciences
Precipitates
Scanning electron microscopy
Solid Mechanics
Solid solutions
Superalloys
X-rays
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Summary:Plasma nitriding of MC2, a single crystalline (γ/γ′) Ni-based superalloy, was performed at 400 °C for 1 and 4 h. Owing to its monomodal γ′ particle size distribution, MC2 was used as a model material in an attempt to investigate the behavior of precipitates during the nitriding of a γ matrix. The nitrogen profiles, the morphology, and the nature of the phases in the nitrided layer were characterized by glow discharge optical emission spectroscopy, scanning electron microscopy, and X-ray diffraction. The γ matrix appeared to be nitrided similarly to the γ solid solution in austenitic stainless steels with the development of an expanded γ N phase. The amount of nitrogen in the γ matrix varies from ~30 at.% at the surface till ~20 at.% at the interface with the non nitrided matrix. On the contrary, the γ′ precipitates accommodate no more than few at.% of nitrogen. This disparity modifies the morphology and the average γ channel width increased by ~25 %.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-6915-z