Hydrogen-assisted cracking of Cr-Mo steel in slow strain rate tensile test with high-pressure gaseous hydrogen

Hisao Matsunaga, Michio Yoshikawa, Ryota Kondo, Hisatake Itoga, Junichiro Yamabe, Saburo Matsuoka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Slow strain rate tensile (SSRT) tests were performed using smooth specimens of quenched and tempered JIS-SCM435 steels with three different tensile strengths (TS), which are ranged from 824 to 1127 MPa. The tests were carried out in 115 MPa hydrogen gas and reference gases (air or 115 MPa nitrogen gas) at three different temperatures; 233 K, room temperature (RT) and 393 K. In the reference gases, the specimens exhibited the so-called cup-and-cone fracture at every temperature. On the other hand, in hydrogen gas, a number of cracks initiated at specimen surface and grew, which led to a marked reduction in ductility at every temperature. The crack growth curves were obtained as a function of true strain by observing the specimen surface of the fractured specimens. The true strain at which the hydrogen-assisted cracking starts was strongly dependent on the microstructure, strength level and test temperature. However, in all the materials tested at RT, the hydrogen-assisted cracking did not occur during the uniform deformation, but occurred in the necking process. Even at 233 K and 393 K, the material with a moderate strength did not exhibit the hydrogen-enhanced cracking before reaching the TS. The result ensured that the Cr-Mo steel with a moderate strength can maintain the TS even in 115 MPa hydrogen from the viewpoint of fracture mechanism.

Original languageEnglish
Title of host publicationMaterials and Fabrication
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791857007, 9780791857007, 9780791857007, 9780791857007
DOIs
Publication statusPublished - Jan 1 2015
EventASME 2015 Pressure Vessels and Piping Conference, PVP 2015 - Boston, United States
Duration: Jul 19 2015Jul 23 2015

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume6B-2015
ISSN (Print)0277-027X

Other

OtherASME 2015 Pressure Vessels and Piping Conference, PVP 2015
CountryUnited States
CityBoston
Period7/19/157/23/15

Fingerprint

Strain rate
Hydrogen
Steel
Gases
Tensile strength
Temperature
Ductility
Cones
Crack propagation
Nitrogen
Cracks
Microstructure
Air

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Matsunaga, H., Yoshikawa, M., Kondo, R., Itoga, H., Yamabe, J., & Matsuoka, S. (2015). Hydrogen-assisted cracking of Cr-Mo steel in slow strain rate tensile test with high-pressure gaseous hydrogen. In Materials and Fabrication (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6B-2015). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP201545742

Hydrogen-assisted cracking of Cr-Mo steel in slow strain rate tensile test with high-pressure gaseous hydrogen. / Matsunaga, Hisao; Yoshikawa, Michio; Kondo, Ryota; Itoga, Hisatake; Yamabe, Junichiro; Matsuoka, Saburo.

Materials and Fabrication. American Society of Mechanical Engineers (ASME), 2015. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6B-2015).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Matsunaga, H, Yoshikawa, M, Kondo, R, Itoga, H, Yamabe, J & Matsuoka, S 2015, Hydrogen-assisted cracking of Cr-Mo steel in slow strain rate tensile test with high-pressure gaseous hydrogen. in Materials and Fabrication. American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, vol. 6B-2015, American Society of Mechanical Engineers (ASME), ASME 2015 Pressure Vessels and Piping Conference, PVP 2015, Boston, United States, 7/19/15. https://doi.org/10.1115/PVP201545742
Matsunaga H, Yoshikawa M, Kondo R, Itoga H, Yamabe J, Matsuoka S. Hydrogen-assisted cracking of Cr-Mo steel in slow strain rate tensile test with high-pressure gaseous hydrogen. In Materials and Fabrication. American Society of Mechanical Engineers (ASME). 2015. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP). https://doi.org/10.1115/PVP201545742
Matsunaga, Hisao ; Yoshikawa, Michio ; Kondo, Ryota ; Itoga, Hisatake ; Yamabe, Junichiro ; Matsuoka, Saburo. / Hydrogen-assisted cracking of Cr-Mo steel in slow strain rate tensile test with high-pressure gaseous hydrogen. Materials and Fabrication. American Society of Mechanical Engineers (ASME), 2015. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP).
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