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Creep deformation characteristics of austenitic stainless steel foils

Osman, H. and Tamin, Mohd. Nasir (2011) Creep deformation characteristics of austenitic stainless steel foils. In: Key Engineering Materials. Trans Tech Publications, Switzerland, 906 -911. ISBN 978-087849210-7

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Official URL: http://dx.doi.org/10.4028/www.scientific.net/KEM.4...

Abstract

Creep deformation process of austenitic stainless steel foil with thickness 0.25 mm was investigated. The foil specimen was creep tested at 750°C, 54 MPa to establish baseline behavior for its extended use as primary surface recuperator in advanced microturbine. The creep curve of the foil shows that the primary creep stage is brief and creep life is dominated by tertiary creep deformation. The curve is well represented by the modified theta-projection concept model with hardening and softening terms. Morphology of fractured foil surface reveals intergranular fracture with shallow network of faceted voids. The formation of w-type creep cavities is significant, as revealed by microstructure of ruptured specimen. Composition analysis indicates the formation of carbides, namely, Cr23C6, NbC and Fe 3Nb3C.

Item Type:Book Section
Uncontrolled Keywords:austenitic stainless steel foil, creep mechanisms, creep-rupture, theta-projection concept model
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:28943
Deposited By: Liza Porijo
Deposited On:04 Dec 2012 07:24
Last Modified:04 Dec 2012 07:24

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