An additive manufactured article formed of a cobalt based alloy, the cobalt based alloy having a chemical composition comprising: 0.08 to 0.25 mass % of carbon; 0.1 mass % or less of boron; 10 to 30 mass % of chromium; 30 mass % or less in total of iron and nickel, the iron being in an amount of 5 mass % or less; 5 to 12 mass % in total of tungsten and/or molybdenum; optionally 2 mass % or less of rhenium, wherein the total amount of the tungsten, the molybdenum and rhenium is 12 mass % or less; 0.5 to 2 mass % in total of titanium, zirconium, niobium and/or tantalum; 0.5 mass % or less of silicon; 0.5 mass % or less of manganese; 0.003 to 0.04 mass % of nitrogen; and the balance being cobalt and impurities, the impurities including 0.5 mass % or less of aluminum, characterized in that the additive manufactured article is a polycrystalline body comprising crystal grains with an average crystal grain size of 10 to 100 μm, and wherein: a) in the crystal grains of the polycrystalline body, segregation cells with an average size of 0.15 to 1.5 μm are formed, said segregation cells being delimited by boundary regions in which components constituting an MC type carbide phase comprising the titanium, the zirconium, the niobium and/or the tantalum and carbon are segregated, said MC type carbide phase being a carbide phase of titanium, zirconium, niobium and/or tantalum, and/or b) grains of the MC type carbide phase are precipitated at an average intergrain distance of 0.15 to 1.5 μm. 0.08 to 0.25 mass % of carbon; 0.1 mass % or less of boron; 10 to 30 mass % of chromium; 30 mass % or less in total of iron and nickel, the iron being in an amount of 5 mass % or less; 5 to 12 mass % in total of tungsten and/or molybdenum; optionally 2 mass % or less of rhenium, wherein the total amount of the tungsten, the molybdenum and rhenium is 12 mass % or less; 0.5 to 2 mass % in total of titanium, zirconium, niobium and/or tantalum; 0.5 mass % or less of silicon; 0.5 mass % or less of manganese; 0.003 to 0.04 mass % of nitrogen; and the balance being cobalt and impurities, the impurities including 0.5 mass % or less of aluminum, characterized in that the additive manufactured article is a polycrystalline body comprising crystal grains with an average crystal grain size of 10 to 100 μm, and wherein: a) in the crystal grains of the polycrystalline body, segregation cells with an average size of 0.15 to 1.5 μm are formed, said segregation cells being delimited by boundary regions in which components constituting an MC type carbide phase comprising the titanium, the zirconium, the niobium and/or the tantalum and carbon are segregated, said MC type carbide phase being a carbide phase of titanium, zirconium, niobium and/or tantalum, and/or b) grains of the MC type carbide phase are precipitated at an average intergrain distance of 0.15 to 1.5 μm. a) in the crystal grains of the polycrystalline body, segregation cells with an average size of 0.15 to 1.5 μm are formed, said segregation cells being delimited by boundary regions in which components constituting an MC type carbide phase comprising the titanium, the zirconium, the niobium and/or the tantalum and carbon are segregated, said MC type carbide phase being a carbide phase of titanium, zirconium, niobium and/or tantalum, and/or b) grains of the MC type carbide phase are precipitated at an average intergrain distance of 0.15 to 1.5 μm.