Method for preparing nano spherical oxide dispersion strengthening phase

Patent metadata

Field	Value
Publication number	US-12134128-B2
Application number	US-202117533074-A
Country	US
Kind code	B2
Filing date	Nov 22, 2021
Priority date	Oct 14, 2020
Publication date	Nov 5, 2024
Grant date	Nov 5, 2024

Abstract

A method for preparing a nano spherical oxide dispersion strengthening phase using a micron oxide is proposed for the first time. First, a micron oxide is used as a raw material to prepare a nano oxide with a completely amorphous structure/matrix alloy composite powder by mechanical ball milling in stages. In the first stage, ball milling is performed, causing the oxide to break and transform in structure, and achieving nano-sizing and completely amorphization, to prepare a composite powder with a completely amorphous structure nano oxide uniformly distributed in the matrix alloy powder; and in the second stage, the composite powder obtained in the first stage and the remaining matrix alloy powder are uniformly mixed by ball milling. Then, the uniformly mixed powder is sequentially subjected to hot forming, hot rolling, and heat treatment, to obtain a nano spherical oxide dispersion strengthened alloy.

First claim

What is claimed is:

1. A method for preparing a nano spherical oxide dispersion strengthening phase, comprising: mixing a micron oxide with a matrix alloy powder, and preparing a composite powder with a uniformly distributed amorphous nano oxide by a mechanical ball milling in a plurality of stages; in a first stage of the plurality of stages, mixing and ball milling the micron oxide with a part of the matrix alloy powder to prepare the composite powder with a completely amorphous structure nano oxide particles uniformly distributed in the matrix alloy powder; in a second stage of the plurality of stages, uniformly mixing the composite powder obtained in the first stage with a remaining part of the matrix alloy powder by the mechanical ball milling; and subjecting the composite powder obtained in the second stage to a hot forming, a hot rolling, and a heat treatment, to prepare the nano spherical oxide dispersion strengthening phase.

2. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 1 , wherein
the nano spherical oxide dispersion strengthening phase comprises at least one selected from the group consisting of Y 2 O 3 , TiO, Y 2 TiO 5 , Y 2 TiO 7 , Y—Ti—O, Y—Cr—O, and Y—W—O; a size of the nano spherical oxide dispersion strengthening phase is less than or equal to 100 nm; and
the matrix alloy powder is one selected from the group consisting of a Fe—Cr—W—Ti or Fe—Cr—W alloy, a nickel-based superalloy, a copper alloy, and a high-entropy alloy.

3. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 2 , wherein
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.0Y 2 O 3 alloy, an elongation is greater than 12.50%;
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.5Y 2 O 3 alloy, the elongation is greater than 12.00%; and
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-2.0Y 2 O 3 alloy, the elongation is greater than 11.50%.

4. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 1 , wherein the hot forming is one selected from the group consisting of a powder extrusion, a powder forging, and a hot isostatic pressing.

5. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 4 , wherein
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.0Y 2 O 3 alloy, an elongation is greater than 12.50%;
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.5Y 2 O 3 alloy, the elongation is greater than 12.00%; and
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-2.0Y 2 O 3 alloy, the elongation is greater than 11.50%.

6. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 1 , wherein a temperature of the hot rolling is a rolling temperature of a matrix alloy, a total deformation is greater than 40%, and wherein the temperature of the hot rolling with a Fe—Cr—W—Ti or Fe—Cr—W alloy as the matrix alloy is 950-1050° C.

7. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 6 , wherein
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.0Y 2 O 3 alloy, an elongation is greater than 12.50%;
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.5Y 2 O 3 alloy, the elongation is greater than 12.00%; and
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-2.0Y 2 O 3 alloy, the elongation is greater than 11.50%.

8. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 1 , wherein the heat treatment is a vacuum annealing heat treatment; an annealing temperature is greater than T x ° C., and an annealing time is 1-3 h; and the T x is a crystallization temperature of the amorphous nano oxide.

9. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 8 , wherein
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.0Y 2 O 3 alloy, an elongation is greater than 12.50%;
when the nano spherical oxide dispersion strengthening phase a Fe-14Cr-3W-0.4Ti-1.5Y 2 O 3 alloy, the elongation is greater than 12.00%; and
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-2.0Y 2 O 3 alloy, the elongation is greater than 11.50%.

10. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 1 , wherein
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.0Y 2 O 3 alloy, an elongation is greater than 12.50%;
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.5Y 2 O 3 alloy, the elongation is greater than 12.00%; and
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-2.0Y 2 O 3 alloy, the elongation is greater than 11.50%.

11. A method for preparing a nano spherical oxide dispersion strengthening phase, comprising:
using an oxide powder as a first raw material and an alloy powder as a second raw material; mixing and ball milling the first raw material with a part of the second raw material to obtain a composite powder with completely amorphous structure nano oxide particles; mixing the composite powder with a remaining part of the second raw material by the mechanical ball milling, to obtain a uniformly mixed composite powder; subjecting the uniformly mixed composite powder to hot forming to prepare a nano-oxide dispersion strengthened alloy; and subjecting the nano-oxide dispersion strengthened alloy to a hot rolling and an annealing heat treatment, to obtain a nano spherical oxide-phase dispersion strengthened alloy, wherein
a mass ratio of the first raw material to the part of the second raw material is 1:(1-10), and a mass ratio of the first raw material to the second raw material is (0.5-5):(99.5-95);
the oxide powder of the first raw material is at least one selected from the group consisting of Y 2 O 3 and TiO 2 ; and
the alloy powder of the second raw material is one selected from the group consisting of a Fe—Cr—W—Ti or Fe—Cr—W alloy, a nickel-based superalloy, a copper alloy, and a high-entropy alloy.

12. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 11 , wherein
a particle size of the oxide powder of the first raw material is less than 10 μm; and
a particle size of the alloy powder of the second raw material is less than or equal to 150 μm.

13. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 12 , wherein
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.0Y 2 O 3 alloy, an elongation is greater than 12.50%;
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.5Y 2 O 3 alloy, the elongation is greater than 12.00%; and
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-2.0Y 2 O 3 alloy, the elongation is greater than 11.50%.

14. The method for preparing the nano spherical oxide dispersion strengthening phase according to claim 11 , wherein
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.0Y 2 O 3 alloy, an elongation is greater than 12.50%;
when the nano spherical oxide dispersion strengthening phase is a Fe-14Cr-3W-0.4Ti-1.5Y 2 O

Assignees

• Univ Central South

Inventors

• Liu Zuming
• Lu Sizhe
• Li Quan
• Wei Bing
• Zhou Xu
• Nong Bizhong
• Ren Yake
• Ai Yongkang
• Cao Bin

Classifications

• C22C1/051

  Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor · CPC title

• C22C32/0026 Primary

  Matrix based on Ni, Co, Cr or alloys thereof · CPC title

• B22F1/0545 Primary

  Dispersions or suspensions of nanosized particles · CPC title

• B22F2003/248

  Thermal after-treatment · CPC title

• B22F3/24

  After-treatment of workpieces or articles {(B22F3/1146 takes precedence)} · CPC title