Title

Corrosion kinetics of a directionally solidified Ni-base superalloy

Authors

Authors

A. P. Gordon; M. D. Trexler; R. W. Neu; T. J. Sanders;D. L. McDowell

Comments

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Abbreviated Journal Title

Acta Mater.

Keywords

directionally solidified; Ni-base superalloys; low cycle fatigue; syngas; oxidation; LOW-CYCLE FATIGUE; THERMOMECHANICAL FATIGUE; LIFE PREDICTION; BEHAVIOR; TEMPERATURE; OXIDATION; CREEP; SPALLATION; MAR-M247; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

A variety of experiments were carried out to characterize the corrosion kinetics of a longitudinally oriented directionally solidified Nibase 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. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal Title

Acta Materialia

Volume

55

Issue/Number

10

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

3375

Last Page

3385

WOS Identifier

WOS:000246956600007

ISSN

1359-6454

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