Abstract
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 γN 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 %.
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The authors are particularly grateful to Turbomeca–SAFRAN group for providing MC2 samples and to J. Bonneville who lent us Ni3Al samples provided by Pr. J. Vitek (University of Pennsylvania, USA).
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Pichon, L., Cormier, J., Declemy, A. et al. Plasma nitriding response at 400 °C of the single crystalline Ni-based superalloy MC2. J Mater Sci 48, 1585–1592 (2013). https://doi.org/10.1007/s10853-012-6915-z
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DOI: https://doi.org/10.1007/s10853-012-6915-z