Authors: N Birbilis RG Buchheit
Publish Date: 2008/11/04
Volume: 39, Issue: 13, Pages: 3224-3232
Abstract
This study presents quantitative information regarding the extent and morphology of hot corrosion damage evolved upon the surface of nickelbased superalloy Rene 104 Exposure times under an accelerated corrosion regime at 704 °C range from 05 to 100 hours Unlike oxidation hot corrosion is observed to proceed at an alarmingly rapid rate The evolution of hightemperature damage can be distinguished into two regimes The first describes damage occurring at low exposure times corresponding to what is ascribed as a phenomenon of transient oxidation leading to a pitted surface Following a distinguishable incubation period hot corrosion damage proceeds such that damage depths are typically several hundreds of microns with a generalized attack mode dominating the corrosion observed Characteristics of the damage evolution are quantified via optical profilometry while microscopy and XPS are used to support mechanistic interpretationsThe technical assistance of Mary K Cavanaugh with the profilometry and its analysis is gratefully acknowledged This project was supported under the Propulsion 21 scheme in conjunction with GE and NASA NSFDMR Grant No 0114098 is acknowledged for the XPS equipment
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