Oxide Spallation in Beta-NiAl Coated Systems under Mechanicalloading

Mark Harvey; M. Rambaudon; Vincent Maurel; Luc Rémy

doi:10.4028/www.scientific.net/MSF.595-598.101

Paper Titles

Platinum Diffusion and Microstructure Change in a Single Crystal Superalloy and Nickel-Based Model Alloys at 1000°C
p.69

Comparison of the Thermal Cycling Performance of Thermal Barrier Coatings under Isothermal and Heat Flux Conditions
p.77

Influence of Micro-Structure on Oxidation Behavior of a Ni-Based Superalloy at 1000°C
p.87

Short-Time Oxidation of a NiAl(Zr) Bond Coat Thermochemically Deposited on a Nickel-Based Superalloy
p.95

Oxide Spallation in Beta-NiAl Coated Systems under Mechanicalloading
p.101

Creep Deformation / Oxidation Behavior of Re-Cr-Ni Diffusion Barrier Coated Hastelloy-X at 970°C in Air
p.107

Study of the Microstructure and Oxidation Behavior of Chromium Base Alloys Strengthened by NiAl Precipitates
p.117

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

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Oxide Spallation in Beta-NiAl Coated Systems under Mechanicalloading

Abstract:

Thermally grown oxide (TGO) spallation increases the degradation rate of aluminide protective coatings during thermomechanical cycling. Thermal expansion misfit between TGO, bond coat and substrate, applied mechanical load in the system, and local instabilities are known triggers for spallation. Mechanical tests have been performed on coated and oxidised AM1 superalloy. In situ and post mortem study including digital image analysis and SEM were performed in order to characterise strain fields and associated damage field. Good correlation is found between oxide strain and damage extent.