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The Role of Hydrogen-Enhanced Strain-Induced Lattice Defects on Hydrogen Embrittlement Susceptibility of X80 Pipeline Steel
- Source :
- JOM. 69:1375-1380
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
Abstract
- Studies to date have not completely determined the factors influencing hydrogen embrittlement of ferrite/bainite X80 pipeline steel. Hydrogen embrittlement susceptibility was evaluated based on fracture strain in tensile testing. We conducted a thermal desorption analysis to measure the amount of tracer hydrogen corresponding to that of lattice defects. Hydrogen embrittlement susceptibility and the amount of tracer hydrogen significantly increased with decreasing crosshead speed. Additionally, a significant increase in the formation of hydrogen-enhanced strain-induced lattice defects was observed immediately before the final fracture. In contrast to hydrogen-free specimens, the fracture surface of the hydrogen-charged specimens exhibited shallower dimples without nuclei, such as secondary phase particles. These findings indicate that the presence of hydrogen enhanced the formation of lattice defects, particularly just prior to the occurrence of final fracture. This in turn enhanced the formation of shallower dimples, thereby potentially causing premature fracture of X80 pipeline steel at lower crosshead speeds.
- Subjects :
- 010302 applied physics
Materials science
Hydrogen
Bainite
Metallurgy
General Engineering
Thermal desorption
chemistry.chemical_element
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Crosshead
chemistry
Ferrite (iron)
0103 physical sciences
Fracture (geology)
General Materials Science
0210 nano-technology
Hydrogen embrittlement
Tensile testing
Subjects
Details
- ISSN :
- 15431851 and 10474838
- Volume :
- 69
- Database :
- OpenAIRE
- Journal :
- JOM
- Accession number :
- edsair.doi...........390c318cf06d7b8a5f193cde2e52759e