Title:
COBALT-BASED ALLOY PRODUCT AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/049717
Kind Code:
A1
Abstract:
A Co-based alloy product according to the present invention is characterized by having a chemical composition containing, in % by mass, 0.08 to 0.25% of C and 0.003 to 0.2% of N in which the total of C and N is 0.083 to 0.28%, also containing 0.1% or less of B and 10 to 30% of Cr, also containing 5% or less of Fe and 30% or less of Ni in which the total of Fe and Ni is 30% or less, also containing W and/or Mo in which the total of W and Mo is 5 to 12%, also containing 3% or less of Al, 0.5% or less of Si and 0.5% or less of Mn, and also containing 0.5 to 4% of an M component that is a transition metal other than W and Mo and having an atomic radius of more than 130 pm, with the remainder comprising Co and impurities, in which the product is a polycrystal body composed of matrix phase crystal grains, segregation cells in which the M component is segregated in boundary regions are formed in the matrix phase crystal grains, the article has a first region and a second region in which the average sizes of the segregation cells are different from each other, the average size of the segregation cells in the first region is 0.13 to 1.3 μm, inclusive, the average size of the segregation cells in the second region is 0.25 to 2 μm, inclusive, and the ratio of the average size of the segregation cells in the second region to that in the first region is 1.3 or more.
Inventors:
WANG YUTING (JP)
IMANO SHINYA (JP)
IMANO SHINYA (JP)
Application Number:
PCT/JP2020/033547
Publication Date:
March 10, 2022
Filing Date:
September 04, 2020
Export Citation:
Assignee:
MITSUBISHI POWER LTD (JP)
International Classes:
C22C19/07; B22F3/105; B22F3/16; B33Y70/00; B33Y80/00; F01D9/02; F01D25/00
Foreign References:
| JP2019173175A | 2019-10-10 | |||
| JP2019049022A | 2019-03-28 | |||
| JP2016102257A | 2016-06-02 | |||
| JP2017145483A | 2017-08-24 | |||
| JPS6311638A | 1988-01-19 | |||
| JPH029290B2 | 1990-03-01 |
Other References:
See also references of EP 4006188A4
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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