Helium tribology of Inconel 617 subjected to laser peening for high temperature nuclear reactor applications
Journal Article
·
· Applied Surface Science
- Texas A & M Univ., College Station, TX (United States); OSTI
- Texas A & M Univ., College Station, TX (United States)
- Curtiss Wright Surface Technology, Livermore, CA (United States)
- Univ. of Alabama, Tuscaloosa, AL (United States)
- George Mason Univ., Fairfax, VA (United States)
Inconel 617 is among the best candidates for utilization in high temperature gas cooled reactor tribo-components. However, the combined effects of sliding contact, along with intermittent idle times and very high temperature material degradation, deteriorates the alloy tribological performance, especially under a helium atmosphere. Laser peening is a surface treatment technique which can enhance the properties at the surface and subsurface by generating deep residual stresses and enhanced microstructure. In this work, we report the tribological behavior of regular laser peened as well as thermally-engineered laser peened Inconel 617 under helium and air atmospheres at 800 °C. In addition to friction and wear studies, the specimens are characterized by different analytical techniques to further understand the mechanisms involved in the peening process and sliding contact. Regardless of the peening process and post-process treatment types, it is observed that laser peening improves the tribological characteristics of Inconel 617. Interestingly, laser peening followed by helium thermal aging shows highly enhanced tribological behavior. This is attributed to the strengthening effect of the laser peening on the surface oxides providing an excellent and lasting protective and lubricating film under helium exposure.
- Research Organization:
- Texas A & M Univ., College Station, TX (United States). Texas A & M Engineering Experiment Station
- Sponsoring Organization:
- USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
- Grant/Contract Number:
- NE0008549
- OSTI ID:
- 1976872
- Alternate ID(s):
- OSTI ID: 1862573
- Journal Information:
- Applied Surface Science, Journal Name: Applied Surface Science Journal Issue: C Vol. 577; ISSN 0169-4332
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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