US 11,884,995 B2
Co-based alloy material, co-based alloy product, and method for manufacturing said product
Atsuo Ota, Tokyo (JP); and Shinya Imano, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Aug. 30, 2022, as Appl. No. 17/898,986.
Claims priority of application No. 2021-142631 (JP), filed on Sep. 1, 2021.
Prior Publication US 2023/0070692 A1, Mar. 9, 2023
Int. Cl. C22C 19/07 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 40/20 (2020.01); B22F 10/28 (2021.01); B22F 10/64 (2021.01); C22F 1/10 (2006.01)
CPC C22C 19/07 (2013.01) [B22F 10/28 (2021.01); B22F 10/64 (2021.01); B33Y 10/00 (2014.12); B33Y 40/20 (2020.01); B33Y 70/00 (2014.12); C22F 1/10 (2013.01); B22F 2301/15 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A Co-based alloy material, having a chemical composition comprising:
Al of 0.1 mass % or more and 10 mass % or less;
W of 3 mass % or more and 45 mass % or less, the total content of the Al and the W being 50 mass % or less;
O of 0.007 mass % or more and 0.05 mass % or less; and
the balance being Co and impurities,
wherein in γ phase crystal grains as a matrix phase of the Co-based alloy material, segregation cells within an average size of 0.15 μm or more and 1.5 μm or less are formed,
wherein in the segregation cells, γ′ phase grains within a size of 0.01 μm or more and 0.5 μm or less including Co, Al and W are dispersively precipitated, and
wherein on boundary regions of the segregation cells and grain boundaries of the γ phase crystal grains, μ phase grains within a size of 0.005 μm or more and 2 μm or less including Co and W are dispersively precipitated.