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Delamination of pipeline steels: determination of an anisotropic cleavage criterion

Published online by Cambridge University Press:  10 February 2014

F. Tankoua ,
J. Crepin ,
P. Thibaux ,
M. Arafin ,
S. Cooreman  and
A.F. Gourgues
F. Tankoua*
Affiliation:
MINES ParisTech, Centre des Matériaux, UMR CNRS 7633, BP 87, 91003 Evry Cedex, France
J. Crepin
Affiliation:
MINES ParisTech, Centre des Matériaux, UMR CNRS 7633, BP 87, 91003 Evry Cedex, France
P. Thibaux
Affiliation:
ArcelorMittal R&D Gent, Pres. J.F. Kennedylaan 3, 9060 Zelzate, Belgium
M. Arafin
Affiliation:
ArcelorMittal R&D Gent, Pres. J.F. Kennedylaan 3, 9060 Zelzate, Belgium
S. Cooreman
Affiliation:
ArcelorMittal R&D Gent, Pres. J.F. Kennedylaan 3, 9060 Zelzate, Belgium
A.F. Gourgues
Affiliation:
MINES ParisTech, Centre des Matériaux, UMR CNRS 7633, BP 87, 91003 Evry Cedex, France
*
a Corresponding author: franck.tankoua@ensmp.fr
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Abstract

Cleavage fracture anisotropy has been studied on a ferrite-bainite low alloy pipeline steel plate. Mechanical tests have been performed on smooth and notched bars taken along the three principal directions of the plate at temperatures between 20 °C and −196 °C, and analyzed by finite element calculations with an anisotropic plasticity model. The fracture mode of specimens tested along the normal direction differs from that of specimens taken along the two other directions, together with a lower critical cleavage stress. This difference seems to be related to microtexture anisotropy and might explain the sensitivity of this steel to delamination at low temperatures.

Keywords

Delamination fractureanisotropycleavagemicrotexturepipeline steelsDélaminageanisotropieclivagemicrotexturegazoducs
Type
Research Article
Information
Mechanics & Industry , Volume 15 , Issue 1 , 2014 , pp. 45 - 50
Copyright
© AFM, EDP Sciences 2013

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