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Effect of arisen dislocation density and texture components during cold rolling and annealing treatments on hydrogen induced cracking susceptibility in pipeline steel

Published online by Cambridge University Press:  17 October 2016

M.A. Mohtadi-Bonab ,
M. Eskandari  and
J.A. Szpunar
M.A. Mohtadi-Bonab*
Affiliation:
Department of Mechanical Engineering, Faculty of Engineering, University of Bonab, Bonab, Iran
M. Eskandari
Affiliation:
Department of Materials Science & Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
J.A. Szpunar
Affiliation:
Department of Mechanical Engineering, University of Saskatchewan, S7N5A9 Saskatoon, Saskatchewan, Canada
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this study, we used thermo–mechanical control process (TMCP) technique to investigate the effect of arisen dislocation density and texture components on hydrogen induced cracking susceptibility in as-received API X60 pipeline steel. Dislocations and texture components appeared during cold rolling and annealing treatments. X-ray diffraction and electron backscatter diffraction measurements were used to study these phenomena. We observed that the cold rolling and annealing treatments produced higher dislocation density in deformed and recovered regions. The increase of dislocation density also caused the increased hydrogen trap density. Macro-texture studies by x-ray method indicates that initial weak texture of as-received X60 steel was changed from ζ-fiber to γ-fiber and θ-fiber in 90% cold rolled and annealed specimen. Therefore, the number of grains with 〈100〉||ND orientation which had a harmful effect on hydrogen induced cracking susceptibility increased. The {100} dominant texture and high density of hydrogen traps mitigated against any possible benefits of the other microstructural parameters such as coincidence site lattice boundaries and grain size. As a result, we could not consider this process as a suitable method to increase hydrogen induced cracking resistance in pipeline steel.

Keywords

crystallographic textureelectron backscatter diffractionx-ray diffractionKernel average misorientation
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 21 , 14 November 2016 , pp. 3390 - 3400
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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