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

  • US 9,683,280 B2
  • Filed: 01/10/2014
  • Issued: 06/20/2017
  • Est. Priority Date: 01/10/2014
  • Status: Active Grant
First Claim
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1. An alloy for use in components in contact with liquid fluorides, consisting essentially of, in terms of weight percent:

  • Cr;

    6 to 8.5,Mo;

    5.5 to 13.5,W;

    0.4 to 7.5,Ti;

    1 to 2,Mn;

    0.7 to 0.85,Al;

    0.05 to 0.3,Co;

    0 to 0.1,C;

    0.08 to 0.5,Ta;

    1 to 5,Nb;

    1 to 4,Hf;

    1 to 3,Fe;



    0.01,Ni;

    balance,with Al Ti≦

    2.3 wt. %;

    and said alloy being characterized byi) at alloy temperatures of 850°

    C., a yield strength of at least 36 Ksi, a tensile strength of at least 40 Ksi, a creep rupture life at 12 Ksi of at least 72.1 hours, and a corrosion rate of 8×

    10

    11
    g/cm2s to 25×

    10

    11
    g/cm2s of weight loss during a 1000 hour immersion in liquid FLiNaK at 850°

    C.;

    ii) at alloy temperatures of 850°

    C., a matrix consisting of γ and

    4.0 to 10 wt. % total precipitates, said total precipitates consisting of at least one M6C type carbide and at least one additional precipitate selected from the group consisting of MC type carbides and Ni5M type precipitates;

    iii) said alloy possessing an Mo Equivalent of no less than 5, wherein,

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