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Mechanical properties of haynes® alloy 188 after exposure to LiF-22CaF2, air, and vacuum at 1093 K for periods up to 10,000 hours

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Abstract

As part of a program to provide reassurance that the cobalt- base superalloy Haynes® Alloy 188 can adequately contain a LiF- CaF2 eutectic thermal energy storage salt, 4900- and 10,000- hr exposures of Haynes® Alloy 188 to LiF- 22CaF2, its vapor, vacuum, and air at 1093 K have been undertaken. Following such exposures, the microstructure has been characterized and the 77 to 1200 K tensile properties measured. In addition, 1050 K vacuum creep- rupture testing of as- received and molten salt- and vacuum-exposed samples has been undertaken. Although slight degradation of the mechanical properties of Haynes® Alloy 188 due to prior exposure was observed, dbasically none of the losses could be ascribed to a particular environment. Hence, observed decreases in properties are due to thermal aging effects, not corrosive attack. In view of these findings, Haynes® Alloy 188 is still deemed to be suitable for containment of the eutectic LiF- CaF2 thermal energy storage media.

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Authors and Affiliations

  1. NASA Lewis Research Center, Cleveland, Ohio

    J. D. Whittenberger

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  1. J. D. Whittenberger
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Whittenberger, J.D. Mechanical properties of haynes® alloy 188 after exposure to LiF-22CaF2, air, and vacuum at 1093 K for periods up to 10,000 hours. JMEP 1, 469–482 (1992). https://doi.org/10.1007/BF02682684

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  • DOI: https://doi.org/10.1007/BF02682684

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