Ni-Based Alloy Product and Method for Producing Same, and Ni-Based Alloy Member and Method for Producing Same

Patent metadata

Field	Value
Publication number	US-2016160334-A1
Application number	US-201314905075-A
Country	US
Kind code	A1
Filing date	Jul 17, 2013
Priority date	Jul 17, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

There are provided: an Ni-based alloy member including a γ′ phase precipitation with 36 to 60 volume % and exhibiting a high durable temperature and good cold workability; a method for producing the member; an Ni-based alloy product to be used as a precursor of the member; and a method for producing the product. The Ni-based alloy product has a two-phase structure composed of a γ phase and a γ′ phase being incoherent to the γ phase, the incoherent γ′ phase being present at a ratio of 20 volume % or higher. The Ni-based alloy member produced by cold working the Ni-based alloy product and subsequently by conducting heat treatment comprises a γ phase and a γ′ phase being coherent to the γ phase, the coherent γ′ phase being present at a ratio of 36 to 60 volume %, and has a predetermined shape.

First claim

1 . An Ni-based alloy product, having a two-phase structure composed of a γ (gamma) phase and a γ′ (gamma prime) phase that is incoherent with the γ phase,
wherein the γ′ phase is present at a ratio of 20 volume % or higher.

2 . The Ni-based alloy product according to claim 1 ,
wherein each crystalline grain of the γ phase and the γ′ phase is 100 μm or smaller in grain size.

3 . An Ni-based alloy member produced through cold working and annealing of the Ni-based alloy product according to claim 1 , the Ni-based alloy member comprising a γ (gamma) phase and a γ′ (gamma prime) phase that is coherent with the γ phase,
wherein the γ′ phase is present at a ratio of 36 to 60 volume %, and
wherein the Ni-based alloy member has a predetermined shape.

4 . A method for producing an Ni-based alloy product, the method comprising the step of hot-forging an Ni-alloy at temperatures equal to or higher than 1000° C.,
wherein the Ni-based alloy product has a two-phase structure composed of a γ (gamma) phase and a γ′ (gamma prime) phase that is incoherent with the γ′ phase, and
wherein the γ′ phase is present at a ratio of 20 volume % or higher.

5 . The method for producing an Ni-based alloy product according to claim 4 ,
wherein each crystalline grain of the γ phase and the γ′ phase is 100 μm or smaller in grain size.

6 . A method for producing an Ni-based alloy member, comprising the steps of:
cold-working the Ni-based alloy product produced by the production method according to claim 4 to make a precursor of the Ni-based alloy member that has a predetermined shape; and subjecting the precursor of the Ni-based alloy member to solution and aging heat treatments, wherein the Ni-based alloy member comprises a γ (gamma) phase and a γ′ (gamma prime) phase that is coherent with the γ phase, and wherein the γ′ phase is present at a ratio of 36 to 60 volume %.

7 . The method for producing an Ni-based alloy member according to claim 6 , further comprising the steps of, before the step of cold-working the Ni-based alloy product:
subjecting the Ni-based alloy product to homogenization heat treatment at temperatures equal to or higher than 1000° C. and at which two phases of the γ phase and the γ′ phase coexist; and slow-cooling the Ni-based alloy product to a temperature 100° C. or more below the homogenization heat treatment temperatures.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Imano Shinya
• Kamoshida Hironori

Classifications

• C22C19/007

  with a light metal (alkali metal Li, Na, K, Rb, Cs; earth alkali metal Be, Mg, Ca, Sr, Ba, Al Ga, Ge, Ti) or B, Si, Zr, Hf, Sc, Y, lanthanides, actinides, as the next major constituent · CPC title

• C22C19/05

  with chromium · CPC title

• C22C19/056

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

• C21D9/0068

  for particular articles not mentioned below · CPC title

• C22F1/10 Primary

  of nickel or cobalt or alloys based thereon · CPC title