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

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

Sket, F.¹  Dzieciol, K.²  Isaac, A.¹  Borbely, A.²  Pyzalla, A. R.¹ 

[1] Helmholtz Ctr Berlin Mat & Energy GmbH, D-14109 Berlin, Germany

[2] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

关键词: Synchrotron radiation;    Microtomography;    Creep test;    Activation energy;    Temperature gradient;   

DOI  :  10.1016/j.msea.2009.11.058

来源: Elsevier

【 摘 要 】

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. (C) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

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