Effects of hydrogen partial pressure on crack initiation and growth rate in vintage X52 steel
Journal Article
·
· International Journal of Hydrogen Energy
- Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
There is an increasing interest in ensuring compatibility of existing natural gas infrastructure with conveyance of hydrogen, especially for vintage (pre-1970s) pipeline steels. While hydrogen is known to affect the fatigue and fracture resistance of these materials, there is a lack of data on its effects on crack initiation at low hydrogen partial pressure. To address this gap, the current work presents a series of fatigue tests on vintage API Grade X52 steel in pure nitrogen, air and gaseous hydrogen at partial pressures of 1 and 207 bar. Circumferential notch tension (CNT) specimens with direct current potential difference (DCPD) measurements are used to get S–N curves for crack initiation and failure, and compact tension (CT) tests to assess crack growth rates. Results indicate that air accelerates crack initiation, low hydrogen partial pressure affects the crack growth rate, and higher pressures have the largest impact on both. Surprisingly, crack initiation is faster in air than at 1 bar hydrogen partial pressure. The CNT tests also reveal that the orientation of the banded microstructure has no effect on the crack initiation site, but it influences its growth behavior. Moreover, fractography shows that hydrogen also promotes instances of quasi-cleavage and intergranular fracture, linked to embrittlement of the material. Here, these results demonstrate that, while hydrogen may impact the entirety of the fatigue process, its effects on the early stages of damage accumulation become relevant only at larger pressures. More comprehensive studies of crack initiation in hydrogen atmospheres will be critical to future codes and standards for hydrogen infrastructure.
- Research Organization:
- Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- NA0003525
- OSTI ID:
- 2584891
- Report Number(s):
- SAND--2025-08006J; 1725070
- Journal Information:
- International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: NA Vol. 136; ISSN 0360-3199
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hydrogen accelerated fatigue crack growth of friction stir welded X52 steel pipe
Effects of temperature on fatigue crack growth of a 508-2 steel in LWR environment
Fatigue crack growth of part-through cracks in pressure vessel and piping steels: Air environment results
Journal Article
·
Wed Nov 16 19:00:00 EST 2016
· International Journal of Hydrogen Energy
·
OSTI ID:1333901
Effects of temperature on fatigue crack growth of a 508-2 steel in LWR environment
Technical Report
·
Thu Mar 31 23:00:00 EST 1983
·
OSTI ID:6272176
Fatigue crack growth of part-through cracks in pressure vessel and piping steels: Air environment results
Technical Report
·
Sat Oct 01 00:00:00 EDT 1988
·
OSTI ID:6660531