Title: Solid-solution strengthened austenitic alloys

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Claims: What is claimed is:

1. A solid-solution strengthened austenitic alloy having excellent high-temperature strength consisting essentially of, in weight percent, no more than 0.1 % carbon, from 4 (%C) to 1 % titanium and/or niobium (alone or in combination), from 25 % to 55 % cobalt, from 10 % to 22 % chromium, from 13 % to 25 % tungsten, wherein the amount of 1/5 (%Co) + (%Cr) + (%W) is in the range from 40 % to 44 %, and the balance nickel except for impurities, the amount of carbon being sufficient to form MC type carbides with the titanium and niobium.

2. A solid-solution strengthened austenitic alloy having excellent high-temperature strength consisting essentially of, in weight percent, no more than 0.1 % carbon, from 4 (%C) to 1 % titanium and/or niobium (alone or in combination), from 25 % to 55 % cobalt, from 10 % to 22 % chromium, from 13 % to 25 % tungsten, wherein the amount of 1/5 (%Co) + (%Cr) + (%W) is in the range from 40 % to 44%, at least one element selected from the group consisting of no more than 0.05 % magnesium, no more than 0.02 % boron, no more than 0.2 % yttrium and no more than 0.5 % hafnium, and the balance essentially nickel except for impurities, the amount of carbon being sufficient to form MC type carbides with the titanium and niobium, the amount of said at least one element being sufficient to suppress grain boundary diffusion at high temperature.

3. A solid-solution strengthened austenitic alloy having excellent high-temperature strength consisting of, in weight percent, about 0.05 % carbon, either about 0.4 % titanium or 0.6 % niobium, about 30 % cobalt, about 16 % chromium, about 20 % tungsten, about 0.01 % magnesium, about 0.05 % zirconium and the balance essentially nickel.

4. The alloy of claim 1, wherein said alloy consists of carbon, titanium and/or niobium, cobalt, chromium, tungsten, and nickel.

5. The alloy of claim 2, wherein said alloy consists of carbon, titanium and/or niobium, cobalt, chromium, tungsten, nickel and said at least one element.

6. The alloy of claim 3, wherein said alloy contains 0.4% titanium.

7. The alloy of claim 3, wherein said alloy contains 0.6% niobium.

8. The alloy of claim 2, wherein said alloy contains at least one element selected from the group consisting of no more than 0.05% magnesium, no more than 0.02% boron, no more than 0.2% zirconium, no more than 0.2% yttrium, and no more than 0.5% hafnium.

9. The alloy of claim 1, wherein said alloy contains about 21 to 35% nickel.

10. The alloy of claim 2, wherein said alloy contains about 21 to 35% nickel.
Other info:

Inventors: Watanabe, Rikizo (Yasugi, JA)
Chiba, Yositaka (Yasugi, JA)

Application Number: 457501
Filing Date: 1974-04-03
Publication_date: 1976-02-10
Assignee: Hitachi Metals, Ltd. (JA)
Primary Class(es): 148/442 148/425, 148/427
Other Classes:
US Patent Ref:

2299871	Oct, 1942	Baird	75/171.
2469718	May, 1949	Edlund et al.	75/171.
2704250	Mar, 1955	Payson	75/171.
3346378	Oct, 1967	Foster et al.	75/171.
3362816	Jan, 1968	Winter et al.	75/171.
3393999	Jul, 1968	Lherbier et al.	75/171.

Other Refs:
Primary Examiner: Rutledge, L. Dewayne
Assistant Examiner: Weise, E. L.
Attorney: Craig & Antonelli