Tomographic method for evaluation of apparent activation energy of steady-state creep

Federico Sket (1) , Kristof Dzieciol (2) , Augusta Isaac (1) , Andras Borbely (2) , Ar Pyzalla (1)

1 HZB - Helmholtz-Zentrum Berlin für Materialien und Energie GmbH = Helmholtz Centre Berlin for Materials and Energy = Centre Helmholtz de Berlin pour les matériaux et l'énergie
2 Max-Planck-Institut für Eisenforschung GmbH

A new method for the evaluation of the apparent activation energy of steady-state creep in metals is presented. It is based on in situ monitoring by microtomography the geometry of a specimen subjected to uniaxial load and inhomogeneous temperature distribution. It is shown that microtomography acting as a three dimensional extensometer enables the evaluation of local strain-rates of small material volumes and is an adequate tool for characterization of inhomogeneously deforming specimens. Activation energies obtained with the new method for stainless steel agree within an error of 5% with values obtained according to the classical procedure.

Mots clés: Synchrotron radiation; Microtomography; Creep test; Activation energy; Temperature gradient

Domaines: Matériaux

Federico Sket, Kristof Dzieciol, Augusta Isaac, Andras Borbely, Ar Pyzalla. Tomographic method for evaluation of apparent activation energy of steady-state creep. Materials Science and Engineering: A, 2010, 527 (7-8), pp.2112-2120. ⟨10.1016/j.msea.2009.11.058⟩. ⟨hal-00855062⟩