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Article Dans Une Revue Advances in Science and Technology Année : 2010

Refractoriness, Microstructures and High Temperature Oxidation of TaC-Reinforced Iron-Based Alloys Protected by Chromium-Rich Coatings

Grégory Michel
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Patrice Berthod
Michel Vilasi
Pierre Steinmetz
  • Fonction : Auteur
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Résumé

In some cases chromium, necessary for the resistance to hot corrosion, unfortunately tends to lower the solidus temperature of alloys destined to high temperature applications. However a decrease of its content in the bulk can be allowed by a Cr-enrichment of the alloys sub-surfaces. To examine this possibility in the case of refractory TaC-strengthened iron-based alloys, three {Fe(bal.)-10Cr-0.2 or 0.4C-3 or 6Ta}-alloys were elaborated by foundry in inert atmosphere and subjected to Cr deposit and inwards diffusion by a pack-cementation process. Bulk and sub-surface microstructures examinations and concentrations profiles were performed after each step of elaboration of the future coated alloys as well as after a 50 hours / 1000°C oxidation test in air. A 500µm-deep carbide-free sub-surface with a chromium content twice the bulk one was obtained for the 0.2C-3Ta and 0.4C-6Ta alloys (less deep for the 0.4C-3Ta alloy) and allowed the alloys resisting high temperature oxidation.
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hal-02482373 , version 1 (18-02-2020)

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Grégory Michel, Patrice Berthod, Michel Vilasi, Pierre Steinmetz. Refractoriness, Microstructures and High Temperature Oxidation of TaC-Reinforced Iron-Based Alloys Protected by Chromium-Rich Coatings. Advances in Science and Technology, 2010, 72, pp.53-58. ⟨10.4028/www.scientific.net/AST.72.53⟩. ⟨hal-02482373⟩
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