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Author

Kim, Ji Hyun
UNIST Nuclear Innovative Materials Laboratory(UNIMAT)
Research Interests
  • High temperature water corrosion

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Effect of oxygen potential on crack growth in alloys for advanced energy systems

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Title
Effect of oxygen potential on crack growth in alloys for advanced energy systems
Author
Benz, Julian K.Kim, Ji HyunBallinger, Ronald G.
Keywords
Advanced energy systems; Constant stress; Crack growth; Crack growth rates; Crack paths; Effect of oxygen; Fatigue loadings; In-situ; Intergranular; Oxygen concentrations; Oxygen partial pressure; Specimen surfaces; Static conditions; Static loading; Transgranular
Issue Date
201010
Publisher
ASME-AMER SOC MECHANICAL ENG
Citation
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, v.132, no.10, pp. -
Abstract
The effect of oxygen partial pressure on crack growth rates in Alloy 617 has been studied using both static and fatigue loadings at 650 degrees C over the oxygen partial pressure range 10(-19)-10(-3) atm. Tests were conducted at either the constant stress intensity factor K for static conditions or the constant Delta K 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 K(max) (fatigue) and exhibited what appears to be an increasing crack growth rate with decreasing oxygen concentration.
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DOI
http://dx.doi.org/10.1115/1.3155793
ISSN
0742-4795
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