Co-based alloy material, co-based alloy product, and method for manufacturing said product

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.