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Comparison of thermal diffusion and interfacial reactions for bulk and sputtered titanium on 316L stainless steel

Article dans une revue avec comité de lecture
Author
AUGER, Jean-Marc
ccCOTTON, Dominique
NOUVEAU, Corinne
BESNARD, Aurélien
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
BERNARD, Frédéric
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
ARDIGO-BESNARD, Maria-Rosa
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
MONCHOUX, Jean-Philippe
460 Centre d'élaboration de matériaux et d'études structurales [CEMES]
COURS, R.
460 Centre d'élaboration de matériaux et d'études structurales [CEMES]
MARCELOT, Cécile
460 Centre d'élaboration de matériaux et d'études structurales [CEMES]

URI
http://hdl.handle.net/10985/23864
DOI
10.1016/j.matchemphys.2023.128013
Date
2023-09-15
Journal
Materials Chemistry and Physics

Abstract

As a first step to devise a hybrid process for the production of TiC wear coatings on 316L, consisting of magnetron sputtering followed by titanium carburization, interfacial reactivity between stainless steel and titanium has to be finely understood. Systematic comparisons were carried out on diffusion couples of increasing chemical and geometrical complexity (Fe/Ti, 316L/Ti, and 316L/sputtered Ti), highlighting the formation mechanisms of interfacial structures. Transmission and scanning electron microscopy composition profiles revealed that long-range microstructures in titanium are the result of iron diffusion and oxygen impurities interactions. FeTi and Fe2Ti intermetallics formation is first kinetically driven, then favors thermodynamic stability, leading to compositional changes during thermal cycles. Their growth is shown to be non-diffusion controlled. These compounds act as diffusion barriers for chromium, and traps for carbon, indirectly generating a complex layered structure at the interface. Differences between bulk and sputtered titanium are exclusively linked to the latter smaller scale, including destabilized diffusion fronts, and superficial TiO formation by oxygen rejection after iron diffusion.

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