Alloy article, method for manufacturing same, and product using same
An object of the invention is to provide: an alloy article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the alloy article; and a product using the alloy article. There is provided an alloy article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities. And, ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.
1. An alloy article, having a chemical composition comprising:
20 atomic percent to 35 atomic percent of Co;
19.2 atomic percent to 25 atomic percent of Cr;
10 atomic percent to 25 atomic percent of Fe;
15 atomic percent to 30 atomic percent of Ni;
5 atomic percent to 15 atomic percent of Ti;
1.9 atomic percent to 8 atomic percent of Mo; and
remainder substances of unavoidable impurities,
wherein ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.
2. The alloy article according to claim 1 , wherein
the ultrafine particles are crystalline particles in which the Ni component and the Ti component are more concentrated than in the matrix phase crystals.
3. An alloy article, having a chemical composition comprising:
30 atomic percent to 33 atomic percent of Co,
20 atomic percent to 23 atomic percent of Cr,
20 atomic percent to 23 atomic percent of Fe,
17 atomic percent or more and less than 23 atomic percent of Ni,
5 atomic percent or more and less than 7 atomic percent of Ti,
1 atomic percent to 3 atomic percent of Mo, and
remainder substances of unavoidable impurities,
wherein ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.
4. The alloy article according to claim 1 , wherein
tensile strength thereof is 1050 MPa or more and breaking elongation thereof is 10% or more.
5. The alloy article according to claim 1 , wherein
the matrix phase crystals are an equiaxial crystal in shape and have a simple cubic crystal structure.
6. A method for manufacturing the alloy article according to of claim 1 , comprising the steps of:
mixing and melting raw materials of the alloy to form molten metal;
atomizing to form an alloy powder from the molten metal;
additive manufacturing to form an additive manufactured article with a desired shape by means of an electron beam melting technique of a metal powder-based additive manufacturing method using the alloy powder; and
pseudo-solutionizing heat treatment to pseudo-solutionize the additive manufactured article in a temperature range from 950° C. to 1180° C.
7. The method for manufacturing the alloy article according to claim 6 , wherein
the step of pseudo-solutionizing heat treatment is a process to water-cool or air-cool the additive manufactured article after holding the additive manufactured article within the temperature range.
8. A product using an alloy article,
said alloy article being the alloy article according to claim 1 , and the product being an impeller of a fluid machine.
9. A centrifugal compressor incorporating the impeller according to claim 8 .
10. The alloy article according to claim 2 , wherein
tensile strength thereof is 1050 MPa or more and breaking elongation thereof is 10% or more.
11. The alloy article according to claim 2 , wherein
the matrix phase crystals are an equiaxial crystal in shape and have a simple cubic crystal structure.
12. A product using an alloy article,
said alloy article being the alloy article according to claim 2 , and the product being an impeller of a fluid machine.
13. A centrifugal compressor incorporating the impeller according to claim 12 .
14. An alloy article having a chemical composition comprising:
28.9 atomic percent to 35 atomic percent of Co;
10 atomic percent to 25 atomic percent of Cr;
10 atomic percent to 25 atomic percent of Fe;
15 atomic percent to 30 atomic percent of Ni;
5 atomic percent to 15 atomic percent of Ti;
1.9 atomic percent to 8 atomic percent of Mo; and
remainder substances of unavoidable impurities, wherein ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.
15. The alloy article according to claim 2 , wherein
in the chemical composition, content of the Co is from 28.9 atomic percent to 35 atomic percent.
16. The alloy article according to claim 1 , wherein
in the chemical composition, content of the Ni is from 15 atomic percent to 26.3 atomic percent.
17. The alloy article according to claim 2 , wherein
in the chemical composition, content of the Ni is from 15 atomic percent to 26.3 atomic percent.
18. The alloy article according to claim 3 , wherein
the ultrafine particles are crystalline particles in which the Ni component and the Ti component are more concentrated than in the matrix phase crystals.