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High strength alloys for high temperature service in liquid-salt cooled energy systems

  • US 9,540,714 B2
  • Filed: 03/15/2013
  • Issued: 01/10/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A cobalt-free Υ



  • -strengthened alloy consisting essentially of, expressed in weight percent of the total composition;

    Cr 6.3 to 7.2Al 0.5 to 2Fe 0 to 5Mn 0.7 to 0.8Mo 9 to 12.5Ta 0 to 6Ti 0.99 to 3.5Nb 0.01 to 0.25W 0.2 to 0.6C 0.02 to 0.04B 0 to 0.0005N 0.0001 to 0.002Ni balance said alloy having a Υ



    microstructural component in an amount of calculated weight percent of at least 3 and no more than 17.6; and

    said alloy being characterized by, at 850°

    C., a yield strength of at least 60 Ksi, a tensile strength of at least 70 Ksi, and a creep rupture life at 12 Ksi of at least 700 hours, and a corrosion rate, expressed in weight loss [g/(cm2sec)]10

    11
    during a 1000 hour immersion in liquid FLiNaK at 850°

    C., in the range of 5.5 to 17, and further characterized by a corrosion susceptibility index of no less than about 0.14 and no more than about 0.2.

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