Abstract
A comparative study on the high temperature stability of bare Inconel 617 and Inconel 617 surface-modified by TiAlN overlay- and Al diffusion-coating was performed, and a remarkable improvement in high temperature stability was achieved by surface modification. Microstructural analysis revealed that the formation of brittle and unstable Cr2O3 crusts which makes Inconel 617 vulnerable at high temperatures was inhibited both by a TiO2-rich top layer with an Al-containing subsurface layer (TiAlN overlay-coated), and by an AlxNi1−x (x=0.4–0.6) alloy layer (Al diffusion-coated). Both TiAlN overlay- and Al diffusion-coated Inconel 617 also showed enhanced wear resistance before and after heat treatment at 1000 °C.
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Lee, B.W., Koo, J.H., Park, J.C. et al. Evolution of high temperature stability of Inconel 617 by surface modification. Met. Mater. Int. 18, 661–666 (2012). https://doi.org/10.1007/s12540-012-4014-y
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DOI: https://doi.org/10.1007/s12540-012-4014-y