Abstract
This work is a continuation of the studies of the possibility of formation of a one-piece blisk unit for gas turbine engines by solid-phase pressure welding (PW) of a single-crystal [001] Ni3Al-based VKNA-type blade alloy with a wrought EP975 disk nickel superalloy. The influence of the PW temperature at a strain of 10 and 24% on the structure and mechanical properties of welded specimens at room temperature is investigated. An increase in the process temperature by 50°C to 1175°C is shown not to change the structure of the VKNA-25 alloy, and the γ-phase grain sizes in the EP975 alloy increase from 7–8 to 15–18 μm. During tensile tests, the welded specimens fail through the VKNA-25 alloy, and the strength of the welded specimens fabricated at 1175°C is almost twice as high as that of the specimens fabricated by PW at 1125°C at the same strain of the EP975 alloy. Electron backscatter diffraction (EBSD) analysis of the solid-phase bonding zone demonstrates that the VKNA-25 alloy retains its single-crystal structure.
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