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On the Origin of the Anisotropic Damage of X100 Line Pipe Steel: Part I—In Situ Synchrotron Tomography Experiments

  • Y. MadiEmail author
  • J.-M. Garcia
  • H. Proudhon
  • Y. Shinohara
  • L. Helfen
  • J. Besson
  • T. F. Morgeneyer
Thematic Section: 3D Materials Science
  • 9 Downloads
Part of the following topical collections:
  1. 3D Materials Science 2019

Abstract

In this study, anisotropic ductility and associated damage mechanisms of a grade X100 line pipe steel previously studied at the macroscopic scale were investigated using in situ synchrotron radiation computed tomography of notched round bars. Line pipe materials have anisotropic mechanical properties, such as tensile strength, ductility and toughness. Specimens were tested for loading along both rolling (L) and transverse (T) directions. The in situ data collected allowed quantifying both specimen deformation (evolution of the cross section) and microscopic damage parameters such as porosity, void shape and void orientation. Nucleation at small particles (\({\hbox {CaS/TiO}}_2\)) aligned along the L direction was observed during plastic deformation. It was shown that only very few anisotropic particle clusters are present in the material. However, these clusters led to substantial early void growth for loading normal to the rolling direction, thereby explaining the toughness anisotropy in this material. Significant void growth was observed at the beginning of load decrease for a relatively limited diameter reduction (about 10%). Coalescence of voids within clusters along L direction (Necklace) clearly explained anisotropic rupture.

Keywords

Anisotropy Rupture Plasticity X100 Line pipe steel Synchrotron tomography In situ mechanical testing 

Notes

Acknowledgements

The authors gratefully acknowledge Nippon Steel Corporation for supporting, M. Dimichiel for help in the use of the beamline at the ESRF (experiment ma1932) and Mateis team from INSA-Lyon University for the use of in situ test machine.

Compliance with Ethical Standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.MINES ParisTechPSL Research University, Centre des Matériaux, CNRS UMR 7633EvryFrance
  2. 2.EPF - École d’ingénieur-e-sSceauxFrance
  3. 3.Nippon Steel CorporationTokyoJapan
  4. 4.ESRFGrenobleFrance
  5. 5.Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of TechnologyKarlsruheGermany

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