NDLI: The influence of the microstructure on the effective properties of duplex-type materials under purely thermal loading

Content Provider	EDP Sciences
Author	V.V. Silberschmidt E.A. Werner
Abstract	An analysis is carried out to study the influence of the microstructure on the effective thermomechanical properties of cylindrical specimens of ferritic-austenitic duplex steels under the conditions of purely thermal cyclic loading in the temperature interval ranging from 20 °C to 900 °C. Three different representations for the microstructure of duplex steels with extreme matrix-inclusion topology are realised: a two-zone model and models with a random distribution of the inclusion phase at two different characteristic length scales. The first approach allows to gain some analytical estimates for the coefficients of thermal expansion and for the critical temperature at which the behaviour departs from a thermoelastic one. An additional theoretical analysis based on the Eshelby approach deals with the influence of the morphology of grains/clusters of the inclusions phase on the effective properties. Using an additional topological parameter (number of clusters) together with other parameters characterising the phase distribution makes possible the comparison of results obtained from the different geometries. Conditions for the microstructure-related transition between different types of response of specimens to the thermal cyclic loading, namely ratchetting and plastic shakedown, are discussed.
Ending Page	Pr4-356
Starting Page	Pr4-349
Page Count	8
File Format	HTM / HTML PDF
ISSN	11554339
Alternate Webpage(s)	http://dx.doi.org/10.1051/jp4:2001442
Issue Number	PR4
Journal	Le Journal de Physique IV
Volume Number	11
DOI	10.1051/jp4:2001442
Language	English
Publisher	EDP Sciences
Publisher Date	2001-09-01
Access Restriction	Subscribed
Rights Holder	EDP Sciences
Content Type	Text
Resource Type	Article

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