Title

Corrosion Kinetics Of A Directionally Solidified Ni-Base Superalloy

Keywords

Directionally solidified; Low cycle fatigue; Ni-base superalloys; Oxidation; Syngas

Abstract

A variety of experiments were carried out to characterize the corrosion kinetics of a longitudinally oriented directionally solidified Ni-base superalloy, DS GTD-111, commonly applied as a first- and second-stage blading material in electric power generation gas-powered turbines. Under operating environments, the airfoil sections of turbine blades sustain surface-initiated damage due to the superimposed centrifugal stresses, elevated temperature and presence of corrosive reactants in the environment. As a consequence, surface cracking curtails the service lives of such components. To thoroughly characterize the stress-free and stress-assisted kinetics of diffusion and cyclic oxide rupture, several types of experiments are conducted: low cycle fatigue, thermomechanical fatigue, and thermogravimetric analysis, among others. A key goal of this study is to provide data necessary for the development of diffusion kinetics models. Accordingly, the study is divided into two parts: stress-free diffusion and stress-assisted rupture. Models are developed for each of these conditions. © 2007 Acta Materialia Inc.

Publication Date

6-1-2007

Publication Title

Acta Materialia

Volume

55

Issue

10

Number of Pages

3375-3385

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.actamat.2007.01.034

Socpus ID

34247626885 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/34247626885

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