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CN-120265803-B - Nickel-based alloy

CN120265803BCN 120265803 BCN120265803 BCN 120265803BCN-120265803-B

Abstract

The invention relates to an alumina forming dispersion strengthened nickel base alloy comprising, in weight percent (wt.%) C0.08 to 0.28, si 0 to 1.50, mn 0 to 0.50, cr 15.0 to 20.0, al 4.0 to 5.0, fe 15.0 to 25.0, N0.030 to 0.075, O0 to 0.1, B0 to 0.02, Y0.01 to 0.1, at least one of Ta, zr, hf, ti and Nb 1.0 to 2.7, balance Ni and impurities normally present, wherein the alloy meets the following requirements (C+N)/(Ta+Zr+Hf Nb+Ti) > 1.4 (value in atomic%) 1, zr+Hf-N > 0.05 (value in atomic%) 2. The alloy of the present invention has excellent hot ductility.

Inventors

  • Martin Ostlund
  • THOMAS HOLLAND
  • Matz Hartstead
  • Matz Lundberg
  • Ulrika Bolgren
  • Christina Haraldsson

Assignees

  • 合瑞迈欧洲中东和非洲有限公司

Dates

Publication Date
20260508
Application Date
20231206
Priority Date
20221207

Claims (16)

  1. 1. A dispersion strengthened nickel-base alloy forming aluminum oxide, the alloy comprising, in weight percent (wt.%): C0.08 to 0.28; si 0 to 1.50; Mn 0 to 0.50; cr 15.0 to 20.0; al 4.0 to 5.0; Fe 15.0 to 25.0; n0.030 to 0.075; o0 to 0.1; b0 to 0.02; y0.01 to 0.1; at least one of Ta, zr, hf, ti and Nb 1.0 to 2.7; The balance being Ni and impurities normally present; wherein the alloy meets the following requirements: (C+N)/(Ta+Zr+Hf+Nb+Ti) > 1.4 (value in atomic%) [1]; Zr+Hf-N is not less than 0.05 (value in atomic%) 2.
  2. 2. The aluminum oxide forming dispersion strengthened nickel base alloy of claim 1 wherein the C is present in an amount of 0.15 wt.% to 0.28 wt.%.
  3. 3. The aluminum oxide forming dispersion strengthened nickel base alloy of claim 1 wherein the C is present in an amount of 0.20 wt.% to 0.28 wt.%.
  4. 4. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein the Si content is not more than 0.30 wt%.
  5. 5. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein Mn is an impurity and is present in an amount of up to 0.05 wt%.
  6. 6. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein the Cr content is 17.0 wt% to 19.0 wt%.
  7. 7. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein the content of Fe is 18.0 wt% to 21 wt%.
  8. 8. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein the content of Fe is 18.0 wt% to 20.0 wt%.
  9. 9. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein the oxygen content is from 20 ppm to 1000 ppm.
  10. 10. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein the oxygen content is from 50 ppm to 300 ppm.
  11. 11. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein Ta, zr, hf, ti and Nb are combined in an amount of 1.4 wt% to 2.3 wt%.
  12. 12. An alumina forming dispersion strengthened nickel base alloy according to any one of claims 1-3, wherein Ta, zr, hf, ti and Nb are combined in an amount of 1.6 wt% to 2.0 wt%.
  13. 13. A powder consisting of the alumina forming dispersion strengthened nickel-base alloy of any one of claims 1-12.
  14. 14. An object made of the alumina forming dispersion strengthened nickel-base alloy of any one of claims 1-12 or the powder of claim 13.
  15. 15. The object of claim 14, wherein the object is a HIP-ed object.
  16. 16. The object according to claim 14 or claim 15, wherein the object is in the form of a tube, hollow piece, block, rod, strip, tape, plate or wire.

Description

Nickel-based alloy The present invention relates to an alumina forming nickel-base alloy and to a powder comprising said alumina forming nickel-base alloy. Furthermore, the invention relates to objects made of said alloy or said powder and to the use thereof. Background Nickel-based alloys alloyed with aluminum are used in various high temperature applications, such as heat treatment furnaces, because they form stable and protective aluminum oxides on the surface, which will provide very good oxidation resistance. It is known that objects (e.g., wires or tubes) of nickel-based alloys forming aluminum oxides are difficult to manufacture due to their poor hot ductility. An important factor contributing to this is the intermetallic phase formed during slow cooling/heating at temperatures below about 900 ℃, for example during heat treatment or during heat processing. These intermetallic phases make the alloy hard and brittle and therefore difficult to process. The present invention aims to solve these problems. Disclosure of Invention The present invention thus relates to a nickel-based alloy which fulfils certain requirements with respect to carbon and carbide and nitride forming elements, since the inventors surprisingly found that, if these requirements are met, an object obtained by the alloy or a powder made of the alloy, or after HIP (hot isostatic pressing) will ensure excellent hot ductility. This excellent hot ductility will in turn ensure that substantially no cracks are formed during the hot working manufacturing process when producing the object. Furthermore, the nickel-base alloys of the present invention will provide excellent oxidation resistance and good creep strength at high temperatures for objects composed of said alloys. Accordingly, the present invention relates to an alumina forming, dispersion strengthened (dispersion hardening) nickel base alloy comprising in weight percent (wt.%): C0.08 to 0.28; si 0 to 1.5; Mn 0 to 0.50; cr 15.0 to 20.0; al 4.0 to 5.0; Fe 15.0 to 25.0; n0.030 to 0.075; O <0.1; B <0.02; y0.01 to 0.1; at least one of Ta, zr, hf, ti and Nb 1.0 to 2.7; The balance being Ni and impurities normally present; and wherein the alloy meets the following requirements: (C+N)/(Ta+Zr+Hf+Nb+Ti) > 1.40 (value in atomic%) [1]; Zr+Hf-N is not less than 0.05 (value in atomic%) 2. The inventors have surprisingly found that if the nickel-based alloy is within the above or below defined element ranges and in addition meets the requirements [1] and [2], an object comprising said alloy will ensure excellent hot ductility, which means that the object will be hot worked in a further process to obtain the desired product without crack formation. Furthermore, the nickel-based alloy will have an austenitic microstructure and will have a very good oxidation resistance, in particular at high temperatures, for example above 900 ℃. In addition, the alloy will provide good creep resistance. According to an embodiment, the alloy may be converted into a powder, which is then used to make an object. The powder may be used in HIP processes or additive manufacturing processes such as 3D printing. According to an embodiment, the object defined above or below is a HIPed object, such as a part or product, the HIPed object being an object obtained by a hot isostatic pressing process. According to an embodiment, the object defined above or below has been obtained by using additive manufacturing. The term "desired product" is intended to include, for example, wires, rods, hollow bars, hollow pieces (hollows), belts, tubes, seamless tubes, strips or plates, all of which will be capable of being produced during a thermal processing process without cracking problems. Examples of hot working processes are rolling, forging and/or extrusion. The nickel-base alloy according to the invention is a dispersion strengthened alloy. This effect is achieved by adding one or more elements selected from Ta, zr, hf, ti and Nb. These elements will form dispersion strengthened particles with C and/or N and optionally added O. Dispersion strengthening contributes to mechanical strength and provides excellent creep strength. Thus, the alloy of the present invention will have excellent mechanical properties, especially at high temperatures. The invention also relates to a powder made of the alloy of the invention, thereby having the same requirements (i.e. [1] and [2 ]) and alloying element ranges. The powder can be produced by means of powder metallurgy. The powder metallurgy manufacturing process results in a rapidly setting material in which the brittle phase does not have time to form and large compositional changes do not develop due to segregation. Thus, a mixture of rapidly solidifying powders will give the metal body a substantially uniform composition and a substantially uniform distribution of very small dispersed particles. Examples of suitable applications of the alloy of the invention are as construction material for heat