Development of Cr and Al Pack Cementation Coatings on Co-Based gamma/gamma ' Superalloys
Koenig T, Hagen S, Virtanen S, Galetz MC (2022)
Publication Type: Journal article
Publication year: 2022
Journal
DOI: 10.1007/s11661-022-06807-x
Abstract
Co-based superalloys have been developed as candidate materials to replace Ni-based superalloys in hot sections of turbine engines, however, their oxidation resistance is limited. Therefore, in this work chromium and aluminum diffusion coatings were developed via the pack cementation process for novel gamma/gamma '-strengthened superalloys of the Co-Ni-Al-W system. This alloy system also offers the opportunity to vary the cobalt-to-nickel ratio and the tungsten content systematically to investigate their influence on the coating process. The coating process was shown to successfully enrich the surfaces of such alloys either in aluminum or chromium. For Al, the result was the formation of (Co, Ni)Al on top of an interdiffusion zone, while for chromium a Cr-rich layer in solid solution with the substrate along with the formation of sigma-phase were observed. The coating formation mechanisms are discussed for both coatings in the light of activities and phase formation.
Authors with CRIS profile
Sebastian Hagen
Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Sannakaisa Virtanen
Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Involved external institutions
Germany (DE)How to cite
APA:
Koenig, T., Hagen, S., Virtanen, S., & Galetz, M.C. (2022). Development of Cr and Al Pack Cementation Coatings on Co-Based gamma/gamma ' Superalloys. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science. https://doi.org/10.1007/s11661-022-06807-x
MLA:
Koenig, Till, et al. "Development of Cr and Al Pack Cementation Coatings on Co-Based gamma/gamma ' Superalloys." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science (2022).
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