Numerical Modelling of Diffusion Coupled with Cyclic Oxidation. Application to Alumina-Forming Coatings Used for Industrial Gas Turbine Blades

Dominique Poquillon; Nadia Vialas; Daniel Monceau

doi:10.4028/www.scientific.net/MSF.595-598.159

Paper Titles

A Novel Duplex Re-NiW Based Diffusion Barrier on a Nickel-Base Superalloy for TBC Systems
p.127

Formation of Pt-Modified γ’-Ni₃Al and Re-Based σ-Alloy Coating System and Cyclic Oxidation Behavior of Coated Superalloy
p.135

Preliminary Results of the Isothermal Oxidation Study of Pt-Al-NiCoCrAlYTa Multi-Layered Coatings Prepared by Sparks Plasma Sintering (SPS)
p.143

A Prototype Software Tool for Life Time Assessment of Thermal Barrier Coating Systems
p.151

Numerical Modelling of Diffusion Coupled with Cyclic Oxidation. Application to Alumina-Forming Coatings Used for Industrial Gas Turbine Blades
p.159

Chemistry of Ash-Deposits on Gas Turbines Hot Parts: Reactivity of Nickel, Zinc and Iron Oxides in (Na, V, S) Molten Salts
p.169

Hydrogen Detection in Buried Layers of Thermal Barrier Coatings
p.177

Aluminide Coating Formation on Internal Passages of GTD-111 Superalloy by Slurry Technique
p.185

Enigmatic Moisture Effects on Al₂O₃ Scale and TBC Adhesion
p.191

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Numerical Modelling of Diffusion Coupled with Cyclic Oxidation. Application to Alumina-Forming Coatings Used for Industrial Gas Turbine Blades

Abstract:

A model using a finite elements code is developed to simulate degradation due to combined cyclic oxidation and interdiffusion in materials used in high temperature components of gas turbines. Coating recession due to cyclic oxidation (oxide growth and spalling) is also modelled using a statistical approach. Interdiffusion between coating and superallloy is modelled to predict total Al depletion in the coating. The phase transformations in the alumina-forming coating and the effects of the precipitates at the coating / superalloy interface are investigated. The results of simulations are compared with experimental data. Effects of diffusion parameters and of cyclic oxidation kinetics are discussed.