Aging of Alloy 617 at 650 and 750 Degrees C

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Alloy 617 has been selected as the primary candidate for heat exchanger applications in advanced reactors. For the VHTR this application could require extended service up to a reactor outlet temperature of 950°C. A key hurdle to using this alloy in the VHTR heat exchanger application is qualifying the alloy for Section III of the ASME Boiler and Pressure Vessel Code. In order to Code qualify the material it is necessary to characterize the influence of long term aging on the mechanical behavior. Alloy 617 has been aged at 650 and 750°C for times up to 5300 hours. The microstructure ... continued below

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Benz, Julian; Lillo, Thomas & Wright, Richard January 1, 2013.

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Alloy 617 has been selected as the primary candidate for heat exchanger applications in advanced reactors. For the VHTR this application could require extended service up to a reactor outlet temperature of 950°C. A key hurdle to using this alloy in the VHTR heat exchanger application is qualifying the alloy for Section III of the ASME Boiler and Pressure Vessel Code. In order to Code qualify the material it is necessary to characterize the influence of long term aging on the mechanical behavior. Alloy 617 has been aged at 650 and 750°C for times up to 5300 hours. The microstructure after aging has been characterized using optical and transmission electron microscopies. It has been determined that in addition to carbides, a significant volume fraction of ?’ phase (Ni3Al) is formed at these temperatures. The ?’ does not contribute significantly to changing the tensile or impact properties of the aged material. It does, however, appear to increase creep resistance and impede creep crack growth.

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  • Report No.: INL/EXT-12-27974
  • Grant Number: DE-AC07-05ID14517
  • DOI: 10.2172/1070122 | External Link
  • Office of Scientific & Technical Information Report Number: 1070122
  • Archival Resource Key: ark:/67531/metadc843992

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  • January 1, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 1:40 p.m.

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Benz, Julian; Lillo, Thomas & Wright, Richard. Aging of Alloy 617 at 650 and 750 Degrees C, report, January 1, 2013; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc843992/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.