Investigation of hydrogen assisted cracking in pressure vessels

Samerjit Homrossukon, Sheldon Mostovoy, Judith Todd Copley

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


Hydrogen assisted cracking (HAC) has been investigated in high strength 4140 and low strength Z17D pressure vessel steels, charged at -50 mA/cm 2 in 1N H2SO4 + 25 mg/1 As2O 3 and tested under three-point bend decreasing load. The HAC growth rate for Z17D steel (1.4×10-7 cm/s) was found to be approximately two orders of magnitude slower than that of 4140 steel (3.3×10-5 cm/s), while the threshold stress intensity factor for Z17D steel (∼37 MPa√m) was significantly higher than that of 4140 steel (∼7 MPa√m). This research will show that a single analytical model, based on the hypothesis that hydrogen both reduces crack resistance (R) and increases crack driving force (G), can explain HAC in 4140 and Z17D steels. The model predicts the hydrogen concentration required to initiate HAC as a function of the stress intensity factor and yield strength of the steel. Hydrogen-induced reduction of R was found to dominate HAC in 4140 steel, while hydrogen-induced reduction of R was combined with an increase in G for HAC cracking of Z17D steel.

Original languageEnglish (US)
Title of host publicationProceedings of 2006 ASME Pressure Vessels and Piping Division Conference - ASME PVP2006/ICPVT-11 Conference - Pressure Vessel Technologies for the Global Community
StatePublished - Nov 29 2006
EventASME PVP2006/ICPVT-11 Conference - Vancouver, BC, Canada
Duration: Jul 23 2006Jul 27 2006

Publication series

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


OtherASME PVP2006/ICPVT-11 Conference
CityVancouver, BC

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering


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