Ni-based alloy, Ni-based alloy powder, Ni-based alloy member, and product including Ni-based alloy member

Patent metadata

Field	Value
Publication number	US-11821059-B2
Application number	US-202017607515-A
Country	US
Kind code	B2
Filing date	Sep 4, 2020
Priority date	Sep 6, 2019
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

Provided are a Ni-based alloy capable of being melted and solidified and excellent in corrosion resistance and abrasion resistance, a Ni-based alloy powder, a Ni-based alloy member, and a product including a Ni-based alloy member. The Ni-based alloy excellent in corrosion resistance and abrasion resistance includes, by mass %: Cr: 8.5% to 23.0%; Mo: 8.5% to 27.0%; Ta: 0.5% to 2.5%; W: 15.0 to 51.0%; and C: 1.0 to 3.5%, the balance being Ni and unavoidable impurities, in which the mass ratios Ni:Cr:Mo of Ni, Cr and Mo are 2.5 to 3.5:1:1.0 to 1.5.

First claim

The invention claimed is:

1. A Ni-based alloy comprising, by mass %:
Cr: 8.5% to 23.0%;
Mo: 8.5% to 27.0%;
Ta: 0.5% to 2.5%;
W: 15.0% to 51.0%; and
C: 1.0% to 3.5%, a balance being Ni and unavoidable impurities, wherein
mass ratios Ni:Cr:Mo of Ni, Cr, and Mo are 2.5 to 3.5:1:1.0 to 1.5.

2. The Ni-based alloy according to claim 1 , wherein an atomic ratio W:C of W and C in the Ni-based alloy is 1:0.9 to 1.1.

3. The Ni-based alloy according to claim 1 , including a dendrite structure and a bonding phase surrounding the dendrite structure.

4. The Ni-based alloy according to claim 3 , wherein the dendrite structure has a primary arm, and a secondary arm projecting from the primary arm, and an interval between adjacent secondary arms is equal to or less than 5.0 μm.

5. The Ni-based alloy according to claim 3 , wherein a region where Cr/W ratio is different is present in the dendrite structure.

6. The Ni-based alloy according to claim 5 , wherein a eutectic carbide with a high Cr/W ratio in the dendrite structure is present in a peripheral portion as compared to a central portion of the dendritic structure.

7. A Ni-based alloy powder comprising, by mass %:
Cr: 8.5% to 23.0%;
Mo: 8.5% to 27.0%;
Ta: 0.5% to 2.5%;
W: 15.0% to 51.0%; and
C: 1.0% to 3.5%, a balance being Ni and unavoidable impurities, wherein
mass ratios Ni:Cr:Mo of Ni, Cr, and Mo are 2.5 to 3.5:1:1.0 to 1.5.

8. The Ni-based alloy powder according to claim 7 , wherein an atomic ratio W:C of W and C in the Ni-based alloy powder is 1:0.9 to 1.1.

9. The Ni-based alloy powder according to claim 7 , wherein average particle diameter is 5 to 150 μm.

10. The Ni-based alloy powder according to claim 7 , which is a mixed powder, a granulated powder, or an atomized powder.

11. A Ni-based alloy member comprising, by mass %:
Cr: 8.5% to 23.0%;
Mo: 8.5% to 27.0%;
Ta: 0.5% to 2.5%;
W: 15.0% to 51.0%; and
C: 1.0% to 3.5%, a balance being Ni and unavoidable impurities,
wherein mass ratios Ni:Cr:Mo of Ni, Cr, and Mo are 2.5 to 3.5:1:1.0 to 1.5.

12. The Ni-based alloy member according to claim 11 , wherein an atomic ratio W:C of W and C is 1:0.9 to 1.1.

13. The Ni-based alloy member according to claim 11 , which has a dendrite structure.

14. The Ni-based alloy member according to claim 13 , wherein the dendrite structure has a primary arm, and a secondary arm projecting from the primary arm, and an interval between adjacent secondary arms is equal to or less than 5.0 μm.

15. The Ni-based alloy member according to claim 13 , wherein a region where a Cr/W ratio is different is present in the dendrite structure.

16. The Ni-based alloy member according to claim 15 , wherein a eutectic carbide with a high Cr/W ratio in the dendrite structure is present in a peripheral portion as compared to a central portion of the dendritic structure.

17. A product including an Ni-based alloy member which is the Ni-based alloy member according to claim 11 .

18. A product including an N-based alloy member according to claim 17 , wherein the product is any one of an injection molding screw, any of various kinds of pipings for transport of a corrosive gas or a corrosive product, and a bit of an excavator.

Assignees

• Proterial Ltd

Inventors

• Shiratori Hiroshi
• Shinagawa Kazuya
• Koseki Shuho
• Otsubo Yasuhiko
• Kuwabara Kousuke

Classifications

• C22C19/055 Primary

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

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• B33Y70/00

  Materials specially adapted for additive manufacturing · CPC title

• C22C19/056

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

• B22F2301/15

  Nickel or cobalt · CPC title