Intermediate strength alloys for high temperature service in liquid-salt cooled energy systems
First Claim
Patent Images
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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Abstract
An alloy consists essentially of, in terms of weight percent: 6 to 8.5 Cr, 5.5 to 13.5 Mo, 0.4 to 7.5 W, 1 to 2 Ti, 0.7 to 0.85 Mn, 0.05 to 0.3 Al, up to to 0.1 Co, 0.08 to 0.5 C, 1 to 5 Ta, 1 to 4 Nab, 1 to 3 Hf, balance Ni. The alloy is characterized by, at 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, expressed in weight loss [g/(cm2sec)]×10−11 during a 1000 hour immersion in liquid FLiNaK at 850° C., in the range of 8 to 25.
75 Citations
15 Claims
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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 by i) 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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2. An alloy in accordance with claim 1 wherein the range of Cr is 6.7 to 8.3 weight percent.
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3. An alloy in accordance with claim 1 wherein the range of Mo is 5.81 to 12.93 weight percent.
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4. An alloy in accordance with claim 1 wherein the range of W is 0.52 to 6.99 weight percent.
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5. An alloy in accordance with claim 1 wherein the range of Ti is 1.15 to 1.22 weight percent.
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6. An alloy in accordance with claim 1 wherein the range of Mn is 0.75 to 0.79 weight percent.
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7. An alloy in accordance with claim 1 wherein the range of Al is 0.08 to 0.11 weight percent.
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8. An alloy in accordance with claim 1 wherein the range of Co is 0.01 to 0.08 weight percent.
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9. An alloy in accordance with claim 1 wherein the range of Ta is 1.18 to 4.82 weight percent.
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10. An alloy in accordance with claim 1 wherein the range of Nb is 1.06 to 3.76 weight percent.
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11. An alloy in accordance with claim 1 wherein the range of Hf is 1.13 to 2.77 weight percent.
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12. An alloy in accordance with claim 1 wherein the range of C is 0.1 to 0.25 weight percent.
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13. An alloy in accordance with claim 1 wherein sad alloy is further characterized by 1 to 8 wt. % M6C type carbides.
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14. An alloy in accordance with claim 1 wherein said alloy is further characterized by up to 3.5 wt. % MC type carbides.
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15. An alloy in accordance with claim 1 wherein said alloy is further characterized by up to 3 wt. % Ni5M type precipitates.
Specification