The effect of oxygen partial pressure on crack growth rates in Alloy 617 has been studied using both static and fatigue loadings at over the oxygen partial pressure range . Tests were conducted at either the constant stress intensity factor for static conditions or the constant in fatigue. Oxygen concentration was measured on both the inlet and outlet of the test retort as well as in situ with a probe located directly at the specimen surface. For fatigue loading the crack path was observed to be transgranular but crystallographic with a decreasing growth rate as the oxygen concentration decreased. However, for static loading the crack path shifted to intergranular at the same (fatigue) and exhibited what appears to be an increasing crack growth rate with decreasing oxygen concentration.
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October 2010
Research Papers
Effect of Oxygen Potential on Crack Growth in Alloys for Advanced Energy Systems
Julian K. Benz,
Julian K. Benz
Department of Materials Science and Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139
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Ji Hyun Kim,
Ji Hyun Kim
Division of Energy Engineering,
Ulsan National Institute of Science and Technology (UNIST)
, Ulsan, Republic of Korea 681-800
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Ronald G. Ballinger
Ronald G. Ballinger
Department of Nuclear Science and Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139
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Julian K. Benz
Department of Materials Science and Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139
Ji Hyun Kim
Division of Energy Engineering,
Ulsan National Institute of Science and Technology (UNIST)
, Ulsan, Republic of Korea 681-800
Ronald G. Ballinger
Department of Nuclear Science and Engineering,
Massachusetts Institute of Technology
, Cambridge, MA 02139J. Eng. Gas Turbines Power. Oct 2010, 132(10): 102901 (7 pages)
Published Online: June 30, 2010
Article history
Received:
November 11, 2008
Revised:
November 14, 2008
Online:
June 30, 2010
Published:
June 30, 2010
Citation
Benz, J. K., Kim, J. H., and Ballinger, R. G. (June 30, 2010). "Effect of Oxygen Potential on Crack Growth in Alloys for Advanced Energy Systems." ASME. J. Eng. Gas Turbines Power. October 2010; 132(10): 102901. https://doi.org/10.1115/1.3155793
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