Method of producing Co—Ni-based alloy

Patent metadata

Field	Value
Publication number	US-10808306-B2
Application number	US-201514966817-A
Country	US
Kind code	B2
Filing date	Dec 11, 2015
Priority date	Sep 16, 2010
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

Provided is a Co—Ni-based alloy in which a crystal is easily controlled, a method of controlling a crystal of a Co—Ni-based alloy, a method of producing a Co—Ni-based alloy, and a Co—Ni-based alloy having controlled crystallinity. The Co—Ni-based alloy includes Co, Ni, Cr, and Mo, in which the Co—Ni-based alloy has a crystal texture in which a Goss orientation is a main orientation. The Co—Ni-based alloy preferably has a composition including, in terms of mass ratio: 28 to 42% of Co, 10 to 27% of Cr, 3 to 12% of Mo, 15 to 40% of Ni, 0.1 to 1% of Ti, 1.5% or less of Mn, 0.1 to 26% of Fe, 0.1% or less of C, and an inevitable impurity; and at least one kind selected from the group consisting of 3% or less of Nb, 5% or less of W, 0.5% or less of Al, 0.1% or less of Zr, and 0.01% or less of B.

First claim

What is claimed is:

1. A method of producing a Co—Ni-based alloy, consisting of the following sequential steps:
providing an ingot that includes Co, Ni, Cr, and Mo,
subjecting the ingot to hot forging, followed by annealing;
cold rolling the ingot at a reduction ratio of 15% or more to provide a Co—Ni-based alloy with a crystal texture in which deformation twins are separated by fine regions and a Goss orientation is a main orientation, wherein, the fine regions are defined as high-density dislocation regions having a higher dislocation than the deformation twins and the deformation twins are defined as low-density dislocation regions having a lower dislocations than the fine regions; and,
heat treating at a temperature of at least about 350° C. to 750° C. for 0.5 hour or more and 1.5 hours or less, wherein a main orientation of the crystal texture after heat treatment is identical to a main orientation of the crystal texture before heat treatment,
wherein the Co—Ni-based alloy has a Cr mass ratio of 19% to 27%.

2. The method of claim 1 , wherein the Co—Ni-based alloy has a composition including, in terms of mass ratio:
28 to 42% of Co, 19% of Cr, 3 to 12% of Mo, 15 to 40% of Ni, 0.1 to 1% of Ti, 1.5% or less of Mn, 0.1 to 26% of Fe, 0.1% or less of C, and an inevitable impurity; and
at least one kind selected from the group consisting of 3% or less of Nb, 5% or less of W, 0.5% or less of Al, 0.1% or less of Zr, and 0.01% or less of B.

3. The method of claim 1 , wherein the cold rolling is conducted at a reduction ratio of less than 90%.

4. The method of claim 1 , wherein after cold rolling the Co—Ni-based alloy has a crystal texture in which a Goss orientation accounts for 35 to 55% of all orientations.

5. The method of claim 1 , wherein, after heat treating, the crystal texture is converted to a texture in which a plurality of low-density dislocation regions are present in high density dislocation regions.

6. The method of claim 5 , wherein, after heat treating, the alloy has a dislocation density of 10 15 m −2 or more.

Assignees

• Chiba Akihiko
• Otomo Takuma
• Akasaka Yasunori
• Kobayashi Tomoo
• Sugawara Ryo
• Seiko Instr Inc
• Univ Tohoku

Inventors

• Chiba Akihiko
• Otomo Takuma
• Akasaka Yasunori
• Kobayashi Tomoo
• Sugawara Ryo

Classifications

• C22C19/056

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• H01F1/147

  Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} · CPC title

• C22F1/10 Primary

  of nickel or cobalt or alloys based thereon · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C21D1/26

  Methods of annealing · CPC title