Tests on the fatigue crack growth rate were conducted on four pipeline steels, two of grade API 5L-X52 and two API 5L-X70. One X52 material was manufactured in the mid-1960s and the other was manufactured in 2011. The two X70 materials had a similar vintage and chemistry, but the microstructure differs. The fatigue tests were performed in 5.5 and 34 MPa pressurized hydrogen gas, at 1 Hz and (load ratio) R = 0.5. At high pressures of hydrogen and high values of the stress intensity factor range (ΔK) there is no difference in the fatigue crack growth rates (da/dN), regardless of strength or microstructure. At low values of ΔK, however, significant differences in the da/dN are observed. The older X52 material has a ferrite-pearlite microstructure; whereas, the modern X52 has a mixture of polygonal and acicular ferrites. The X70 materials are both predominantly polygonal ferrite, but one has small amounts (∼5%) of upper bainite, and the other has small amounts of pearlite (<2%) and acicular ferrite (∼5%). We discuss the fatigue test results with respect to the different microstructures, with particular emphasis on the low ΔK regime.
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ASME 2013 Pressure Vessels and Piping Conference
July 14–18, 2013
Paris, France
Conference Sponsors:
- Pressure Vessels and Piping Division
- Nondestructive Evaluation Engineering Division
ISBN:
978-0-7918-5571-3
PROCEEDINGS PAPER
The Effect of Microstructure on the Hydrogen-Assisted Fatigue of Pipeline Steels
Elizabeth S. Drexler,
Elizabeth S. Drexler
NIST, Boulder, CO
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Douglas G. Stalheim,
Douglas G. Stalheim
DGS Metallurgical Solutions, Inc., Vancouver, WA
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Louis E. Hayden
Louis E. Hayden
Louis E. Hayden Associates, Bethlehem, PA
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Andrew J. Slifka
NIST, Boulder, CO
Elizabeth S. Drexler
NIST, Boulder, CO
Douglas G. Stalheim
DGS Metallurgical Solutions, Inc., Vancouver, WA
Robert L. Amaro
NIST, Boulder, CO
Damian S. Lauria
NIST, Boulder, CO
April E. Stevenson
NIST, Boulder, CO
Louis E. Hayden
Louis E. Hayden Associates, Bethlehem, PA
Paper No:
PVP2013-97217, V06BT06A009; 8 pages
Published Online:
January 17, 2014
Citation
Slifka, AJ, Drexler, ES, Stalheim, DG, Amaro, RL, Lauria, DS, Stevenson, AE, & Hayden, LE. "The Effect of Microstructure on the Hydrogen-Assisted Fatigue of Pipeline Steels." Proceedings of the ASME 2013 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Paris, France. July 14–18, 2013. V06BT06A009. ASME. https://doi.org/10.1115/PVP2013-97217
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