Ni-based heat-resistant alloy

• US 11,066,728 B2
• Filed: 12/05/2017
• Issued: 07/20/2021
• Est. Priority Date: 12/22/2016
• Status: Active Grant

• Current Assignee: Tanaka Kikinzoku Kogyo Kabushiki Kaisha (Tanaka Holdings Company Limited), Tohoku Techno Arch Co., Ltd.
• Original Assignee: Tohoku Techno Arch Co., Ltd.
• Inventors: Ishida, Kiyohito, Omori, Toshihiro, Sato, Yutaka, Sakairi, Koichi, Tanaka, Kunihiro, Nakazawa, Tatsuya
• Primary Examiner(s): Roe, Jessee R
• Application Number:
  US16/471,141
• Publication Number:
  US 20190316229A1
• Time in Patent Office: 1,323 Days
• CPC Class Codes: C22C 19/03 based on nickel
• CPC Class Codes: C22C 19/051 and Mo or W
• CPC Class Codes: C22C 30/00 Alloys containing less than 50% by weight of each constituent
• CPC Class Codes: C22F 1/00 Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working apparatus for mechanical working of metal B21, B23, B24
• CPC Class Codes: C22F 1/10 of nickel or cobalt or alloys based thereon

Abstract

The present invention relates to a Ni-based heat-resistant alloy including Ir: 5.0 mass % or more and 50.0 mass % or less, Al: 1.0 mass % or more and 8.0 mass % or less, W: 5.0 mass % or more and 25.0 mass % or less, and balance Ni, having an L1₂-structured γ′ phase present in the matrix, and including at least one of Zr: 0.01 mass % or more and 3.0 mass % or less and Hf: 0.01 mass % or more and 3.0 mass % or less. This Ni-based heat-resistant alloy has improved toughness over a conventional Ni-based heat-resistant alloy based on a Ni—Ir—Al—W-based alloy, and is also excellent in ambient-temperature strength.

Claims

1. A polycrystalline Ni-based heat-resistant alloy comprising Ir:

5.0 mass % or more and 50.0 mass % or less, Al;

1.0 mass % or more and 8.0 mass % or less, W;

5.0 mass % or more and 25.0 mass % or less, and balance Ni, having an L12-structured γ

′

phase present in the matrix, and

including at least one of Zr;

0.8 mass % or more and 2.0 mass % or less and Hf;

1.0 mass % or more and 2.0 mass % or less.

2. The polycrystalline Ni-based heat-resistant alloy according to claim 1, further comprising C:

0.001 mass % or more and 0.5 mass % or less.

3. The polycrystalline Ni-based heat-resistant alloy according to claim 1, comprising 1.2 mass % or more and 2.0 mass % or less of Zr.

4. The polycrystalline Ni-based heat-resistant alloy according to claim 1, comprising 1.2 mass % or more and 2.0 mass % or less of Hf.

5. The polycrystalline Ni-based heat-resistant alloy according to claim 1, comprising 1.0 mass % or more and 2.0 mass % or less of Zr and 1.0 mass % or more and 2.0 mass % or less of Hf.

6. The polycrystalline Ni-based heat-resistant alloy according to claim 1, comprising at least one addition element selected from the following:

B;

0.001 mass % or more and 0.1 mass % or less

Co;

5.0 mass % or more and 20.0 mass % or less

Cr;

1.0 mass % or more and 25.0 mass % or less

Ta;

1.0 mass % or more and 10.0 mass % or less

Nb;

1.0 mass % or more and 5.0 mass % or less

Ti;

1.0 mass % or more and 5.0 mass % or less

V;

1.0 mass % or more and 5.0 mass % or less

Mo;

1.0 mass % or more and 5.0 mass % or less.

7. The polycrystalline Ni-based heat-resistant alloy according to claim 6, comprising 1.0 mass % or more and 2.0 mass % or less of Zr and 1.0 mass % or more and 2.0 mass % or less of Hf.

8. The polycrystalline Ni-based heat-resistant alloy according to claim 6, further comprising C:

0.001 mass % or more and 0.5 mass % or less.

9. The polycrystalline Ni-based heat-resistant alloy according to claim 8, comprising 1.2 mass % or more and 2.0 mass % or less of Zr.

10. The polycrystalline Ni-based heat-resistant alloy according to claim 8, comprising 1.0 mass % or more and 2.0 mass % or less of Zr and 1.0 mass % or more and 2.0 mass % or less of Hf.