Ni-Ir-based heat-resistant alloy and process for producing same

Patent metadata

Field	Value
Publication number	US-10094012-B2
Application number	US-201515127348-A
Country	US
Kind code	B2
Filing date	Mar 23, 2015
Priority date	Mar 28, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

The present invention relates to a NiIr-base heat-resistant alloy which includes a Ni—Ir—Al—W-base alloy which contains Ir: 5.0 to 50.0 mass %, Al: 1.0 to 8.0 mass %, W: 5.0 to 20.0 mass %, and the balance is Ni, and a γ′ phase having an L12 structure precipitating and dispersing in a matrix as an essential strengthening phase, and a ratio (Y/X) of a peak intensity (Y) of (201) plane of the Ir3W phase observed in the range of 2θ=48° to 50° to a peak intensity (X) of (111) plane of the γ′ phase observed in the range of 2θ=43° to 45° in X-ray diffraction analysis is 0.5 or less. The alloy exhibits good high-temperature property stably.

First claim

The invention claimed is:

1. A NiIr-base heat-resistant alloy comprising
a Ni—Ir—Al—W-base alloy which contains Ir: 5.0 to 50.0 mass %, Al: 1.0 to 8.0 mass %, W: 5.0 to 20.0 mass %, and the balance being Ni, and
a γ′ phase as an essential strengthening phase having an L1 2 structure precipitated and dispersed in a matrix, wherein
a ratio (Y/X) of a peak intensity (Y) of (201) plane of the Ir 3 W phase observed in the range of 2θ=48° to 50° to a peak intensity (X) of (111) plane of the γ′ phase observed in the range of 2θ=43° to 45° in X-ray diffraction analysis is 0.5 or less.

2. The NiIr-base heat-resistant alloy according to claim 1 , comprising one or two or more additive elements selected from the following Group I:
Group I:
B: 0.001 to 0.1 mass %,
Co: 5.0 to 20.0 mass %,
Cr: 1.0 to 25.0 mass %,
Ta: 1.0 to 10.0 mass %,
Nb: 1.0 to 5.0 mass %,
Ti: 1.0 to 5.0 mass %,
V: 1.0 to 5.0 mass %, and
Mo: 1.0 to 5.0 mass %.

3. The NiIr-base heat-resistant alloy according to claim 1 , further containing 0.001 to 0.5 mass % of C and carbides being precipitated and dispersed.

4. The NiIr-base heat-resistant alloy according to claim 1 , wherein Ir in the alloy is substituted by Rh or Pt in an amount of 30 mass % or less.

5. The NiIr-base heat-resistant alloy according to claim 2 , further containing 0.001 to 0.5 mass % of C and carbides being precipitated and dispersed.

6. The NiIr-base heat-resistant alloy according to claim 2 , wherein Ir in the alloy is substituted by Rh or Pt in an amount of 30 mass % or less.

7. The NiIr-base heat-resistant alloy according to claim 3 , wherein Ir in the alloy is substituted by Rh or Pt in an amount of 30 mass % or less.

8. A method of producing a NiIr-base heat-resistant alloy, comprising:
melting and casting for producing an alloy ingot having the composition according to claim 1 by a melting and casting method and
subjecting the alloy ingot to an aging heat treatment in a temperature range of 700 to 1300° C., wherein
a cooling rate in the melting and casting is 200° C./min or more.

9. The method of producing a NiIr-base heat-resistant alloy according to claim 8 , wherein
the aging heat treatment is carried out by heating the alloy in the temperature range of 700 to 1300° C., and then cooling at a cooling rate of 5 to 80° C./sec.

10. The method of producing a NiIr-base heat-resistant alloy according to claim 8 , wherein
the NiIr-base alloy is subjected to a homogenization heat treatment in a temperature range of 1100 to 1800° C., prior to the aging heat treatment.

11. A method of producing a NiIr-base heat-resistant alloy, comprising:
melting and casting for producing an alloy ingot having the composition according to claim 2 by a melting and casting method and
subjecting the alloy ingot to an aging heat treatment in a temperature range of 700 to 1300° C., wherein
a cooling rate in the melting and casting is 200° C./min or more.

12. The method of producing a NiIr-base heat-resistant alloy according to claim 11 , wherein
the aging heat treatment is carried out by heating the alloy in the temperature range of 700 to 1300° C., and then cooling at a cooling rate of 5 to 80° C./sec.

13. The method of producing a NiIr-base heat-resistant alloy according to claim 11 , wherein
the NiIr-base alloy is subjected to a homogenization heat treatment in a temperature range of 1100 to 1800° C., prior to the aging heat treatment.

14. A method of producing a NiIr-base heat-resistant alloy, comprising:
melting and casting for producing an alloy ingot having the composition according to claim 3 by a melting and casting method and
subjecting the alloy ingot to an aging heat treatment in a temperature range of 700 to 1300° C., wherein
a cooling rate in the melting and casting is 200° C./min or more.

15. The method of producing a NiIr-base heat-resistant alloy according to claim 14 , wherein
the aging heat treatment is carried out by heating the alloy in the temperature range of 700 to 1300° C., and then cooling at a cooling rate of 5 to 80° C./sec.

16. The method of producing a NiIr-base heat-resistant alloy according to claim 14 , wherein
the NiIr-base alloy is subjected to a homogenization heat treatment in a temperature range of 1100 to 1800° C., prior to the aging heat treatment.

17. A method of producing a NiIr-base heat-resistant alloy, comprising:
melting and casting for producing an alloy ingot having the composition according to claim 4 by a melting and casting method and
subjecting the alloy ingot to an aging heat treatment in a temperature range of 700 to 1300° C., wherein
a cooling rate in the melting and casting is 200° C./min or more.

18. The method of producing a NiIr-base heat-resistant alloy according to claim 17 , wherein
the aging heat treatment is carried out by heating the alloy in the temperature range of 700 to 1300° C., and then cooling at a cooling rate of 5 to 80° C./sec.

19. The method of producing a NiIr-base heat-resistant alloy according to claim 17 , wherein
the NiIr-base alloy is subjected to a homogenization heat treatment in a temperature range of 1100 to 1800° C., prior to the aging heat treatment.

Assignees

• Tanaka Precious Metal Ind

Inventors

• Ishida Kiyohito
• Omori Toshihiro
• Sato Yutaka
• Tanaka Kunihiro
• Nakamura Muneki
• Sakairi Koichi
• Nakazawa Tatsuya

Classifications

• C22F1/10 Primary

  of nickel or cobalt or alloys based thereon · CPC title

• C22C19/03 Primary

  based on nickel · CPC title

• C22C30/00

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C19/056

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• C22C19/055

  with the maximum Cr content being at least 20% but less than 30% · CPC title