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