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Characterization of Microstructure in High Strength Microalloyed Steels Using Quantitative X-Ray Diffraction

[+] Author Affiliations
X. Li, J. B. Wiskel, H. Henein, D. G. Ivey

University of Alberta, Edmonton, Alberta, Canada

O. Omotoso

CANMET Energy Technology Centre - Devon, Devon, Alberta, Canada

Paper No. IPC2008-64643, pp. 445-451; 7 pages
  • 2008 7th International Pipeline Conference
  • 2008 7th International Pipeline Conference, Volume 3
  • Calgary, Alberta, Canada, September 29–October 3, 2008
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4859-3 | eISBN: 798-0-7918-3835-8
  • Copyright © 2008 by ASME and Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources


The mechanical properties of microalloyed steels used in pipelines are strongly affected by microstructure. In this paper, X-ray diffraction (Rietveld method) was used to quantify the microstructure — specifically domain size, microstrain and preferred orientation — for four X80 steels and three experimental X100 steels. Measurements were made at the surface and at several positions below the surface. Nano-sized domains were obtained for all steels tested. A smaller domain size, higher microstrain and stronger preferred orientation were observed in the X100 samples relative to the X80 steels.

Copyright © 2008 by ASME and Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources



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