Hydrogen assisted cracking (HAC) has been investigated in a high strength 4140 steel and a low strength AISI-SAE grade 1022 steel (supplied by Amoco, Naperville, IL—now BP), charged at in 1N and tested under three-point-bend decreasing load. The HAC growth rate for the 1022 steel was found to be approximately two orders of magnitude slower than that of the 4140 steel , while the threshold stress intensity factor for the 1022 steel was significantly higher than that of the 4140 steel . This research develops an analytical model, based on the hypothesis that hydrogen both reduces crack resistance and increases crack driving force , to explain HAC in 4140 and 1022 steels. The model predicts the hydrogen concentration required to initiate HAC as a function of the applied stress intensity factor and yield strength of the steel. Hydrogen-induced reduction in was found to dominate HAC in the 4140 steel, while hydrogen-induced reduction in was combined with an increase in for HAC cracking of the 1022 steel.
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August 2009
Research Papers
Investigation of Hydrogen Assisted Cracking in High and Low Strength Steels
Samerjit Homrossukon,
Samerjit Homrossukon
Faculty of Engineering,
Thammasat University
, 99 Moo 18 Phaholyothin Rd., Ampher Khlongluang, Pathumthani 12121, Thailand
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Sheldon Mostovoy,
Sheldon Mostovoy
Department of Mechanical, Materials and Aerospace Engineering,
Illinois Institute of Technology
, Chicago, IL 60616
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Judith A. Todd
Judith A. Todd
Department of Engineering Science and Mechanics,
Pennsylvania State University
, University Park, PA 16802
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Samerjit Homrossukon
Faculty of Engineering,
Thammasat University
, 99 Moo 18 Phaholyothin Rd., Ampher Khlongluang, Pathumthani 12121, Thailand
Sheldon Mostovoy
Department of Mechanical, Materials and Aerospace Engineering,
Illinois Institute of Technology
, Chicago, IL 60616
Judith A. Todd
Department of Engineering Science and Mechanics,
Pennsylvania State University
, University Park, PA 16802J. Pressure Vessel Technol. Aug 2009, 131(4): 041405 (11 pages)
Published Online: July 1, 2009
Article history
Received:
February 9, 2007
Revised:
July 3, 2008
Published:
July 1, 2009
Citation
Homrossukon, S., Mostovoy, S., and Todd, J. A. (July 1, 2009). "Investigation of Hydrogen Assisted Cracking in High and Low Strength Steels." ASME. J. Pressure Vessel Technol. August 2009; 131(4): 041405. https://doi.org/10.1115/1.3089498
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