Research of solid compound formation during thermal deformation effect on intermetallic Ni3AI-alloy with a heat-resistant alloy EP975 and influence on the physical, mechanical and performance properties

摘要

The work is aimed at processing highly efficient one-piece units of gas turbine aircraft engines discs with blades (blisks) to exclude heavy locking joints and to reduce the weight of the units while improving their reliability. Intermetallic γ'+γ alloys based on γ'-Ni3Al phase (refered to as VKNA) selected as blade material and Ni-based high alloy EP975 selected for discs have similar initial melting temperatures (～1340°C and～1300°C, respectively). Solid state joints (SSJ) EP975 //VKNA-mono are obtained at the homologous temperatures of 0.86-0.91 Tm (K). It is shown that the most efficient method for producing solid state joints between the Ni3Al based intermetallic alloys and the heat resistant deformed Ni-based alloys EP975 is a solid state pressure welding under the conditions of high-temperature superplasticity; this technique has been developed in the IMSP RAS (grant RFBR No 13-08-12200).