GAMMA PRIME PRECIPITATION STRENGTHENED NICKEL-BASE SUPERALLOY FOR USE IN POWDER BASED ADDITIVE MANUFACTURING PROCESS

The application relates to the technology of producing three-dimensional articles by means of powder-based additive manufacturing, such as selective laser melting (SLM) or electron beam melting (EBM). It refers to a Nickel-base superalloy powder, wherein said superalloy powder has a chemical composition that allows establishing a gamma-prime precipitation content of 60-70 vol.-% in the superalloy in a heat treated condition. It is characterized in that said powder has a powder size distribution between 10 and 100 µm and a spherical morphology and that the ratios of the content (in weight- %) of the alloying elements C, B, Hf, Zr, Si are the following: C / B = 10 - 32 ; C / Hf > 2 ; C / Zr > 8 ; C / Si > 1. A preferred embodiment consists of the following chemical composition (in weight-%): 7.7-8.3 Cr; 5.0-5.25 Co; 2.0-2.1 Mo;7.8-8.3 W; 5.8-6.1 Ta; 4.7-5.1 Al; 1.1-1.4 Ti; 0.08-0.16 C; 0.005-0.008 B; 0-0.04 Hf ;0-0.01 Zr; 0-0.08 Si; the remainder being Ni and unavoidable impurities.