Title:
COBALT-BASED ALLOY PRODUCT
Document Type and Number:
WIPO Patent Application WO/2020/179081
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a Co-based alloy product having mechanical properties that are equivalent or superior to those of precipitation-hardened Ni-based alloy materials. The Co-based alloy product according to the present invention has a chemical composition which contains 0.08 to 0.25% by mass of C, 0.1% by mass or less of B and 10 to 30% by mass of Cr, also contains 5% by mass or less of Fe and 30% by mass or less of Ni wherein the total amount of Fe and Ni is 30% by mass or less, also contains W and/or Mo wherein the total amount of the at least one component is 5 to 12% by mass and the total amount of W and Mo is 5 to 12% by mass inclusive, also contains 0.5% by mass or less of Si, 0.5% by mass or less of Mn and 0.003 to 0.04% by mass of N, and also contains an M component that is a transition metal other than W and Mo and having an atomic radius of more than 130 pm in an amount of 0.5 to 2% by mass inclusive, with the remainder made up by Co and impurities, wherein the impurities contain 0.5% by mass or less of Al and 0.04% by mass or less of O. The product is characterized in that the product is a polycrystal body of matrix phase crystals, and segregation cells which have an average size of 0.13 to 2 μm inclusive and in which the M component is segregated in boundary regions are formed in crystal grains of the polycrystal body.
Inventors:
WANG YUTING (JP)
IMANO SHINYA (JP)
EGUCHI SHIGENOBU (JP)
IMANO SHINYA (JP)
EGUCHI SHIGENOBU (JP)
Application Number:
PCT/JP2019/009206
Publication Date:
September 10, 2020
Filing Date:
March 07, 2019
Export Citation:
Assignee:
MITSUBISHI HITACHI POWER SYS (JP)
International Classes:
C22C19/07; B22F1/00; C22F1/10; F28F21/08; C22F1/00
Domestic Patent References:
| WO2019031577A1 | 2019-02-14 |
Foreign References:
| JPH09157780A | 1997-06-17 | |||
| JPS61243143A | 1986-10-29 | |||
| JP2017186620A | 2017-10-12 | |||
| JP2016102229A | 2016-06-02 | |||
| CN107513642A | 2017-12-26 | |||
| JP2019049022A | 2019-03-28 | |||
| JPS61243143A | 1986-10-29 | |||
| JPH07179967A | 1995-07-18 | |||
| JP2016535169A | 2016-11-10 |
Other References:
See also references of EP 3725903A4
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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