Ni—Cr—Mo-based alloy member, Ni—Cr—Mo-based alloy powder, and composite member
Provided are a Ni—Cr—Mo-based alloy, a Ni—Cr—Mo-based alloy powder, a Ni—Cr—Mo-based alloy member, and a member that can be melted and solidified and have excellent corrosion resistance, wear resistance, and crack resistance. A Ni—Cr—Mo-based alloy member according to the present invention includes, by mass %, Cr: 18% to 22%, Mo: 18% to 39%, Ta: 1.5% to 2.5%, B: 1.0% to 2.5%, and a remainder consisting of Ni and unavoidable impurities, where 25≤Cr+(Mo/2B)<38 is satisfied, in which boride particles with a maximum particle size of 70 μm or less are dispersed and precipitated in a parent phase.
1. A Ni—Cr—Mo-based alloy member which is an additively manufactured product, comprising, by mass %:
Cr: 18% to 22%;
Mo: 18% to 39%;
Ta: 1.5% to 2.5%;
B: 1.0% to 2.5%; and
a remainder consisting of Ni and unavoidable impurities, where 25≤Cr+(Mo/2B)<38 is satisfied,
wherein boride particles with a maximum particle size of 70 μm or less are dispersed and precipitated in a parent phase.
2. The Ni—Cr—Mo-based alloy member according to claim 1 , having a dendrite structure in the parent phase.
3. The Ni—Cr—Mo-based alloy member according to claim 1 , wherein the boride particles have an average particle size of 12 μm or less.
4. The Ni—Cr—Mo-based alloy member according to claim 1 ,
wherein the amount of Mo contained in the parent phase is 5% by mass or more.
5. A composite member
wherein a base material and a layer of the Ni—Cr—Mo-based alloy member according to claim 1 are laminated on a surface of the base material.
6. The composite member according to claim 5 , being a screw or a cylinder for injection molding.
7. A composite member comprising a Ni—Cr—Mo-based alloy member according to claim 1 .
8. The Ni—Cr—Mo-based alloy member according to claim 1 ,
wherein the boride particles with an average particle size of 12 μm or less are precipitated in a form in that the boride particles and a metal phase having an FCC structure are folded in layers and crystallized in a lamellar shape.
9. A Ni—Cr—Mo-based alloy powder being used for additively manufacturing, comprising, by mass %:
Cr: 18% to 22%;
Mo: 18% to 39%;
Ta: 1.5% to 2.5%;
B: 1.0% to 2.5%; and
a remainder consisting of Ni and unavoidable impurities, where Cr+ (Mo/2B)≥25 is satisfied.
10. The Ni—Cr—Mo-based alloy powder according to claim 9 ,
wherein d 50 , which is a particle size at a time when an integrated value by laser diffraction-type particle size distribution measurement is 50% by volume, is 10 to 60 μm.
11. The Ni—Cr—Mo-based alloy powder according to claim 9 ,
wherein d 50 , which is a particle size at a time when an integrated value by laser diffraction-type particle size distribution measurement is 50% by volume, is 30 to 250 μm.
12. A composite member comprising a Ni—Cr—Mo-based alloy powder according to claim 9 .