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The paper considers the scientific basis of a new methodological approach for processing bulk and sheet nanostructured semi-finished products from nickel base alloys 718 and 718Plus. This approach involves carrying out severe thermo-mechanical processing (STMP) using primarily schemes of multiple isothermal forging (or forging followed by rolling) at temperatures decreasing gradually from (0.9-0.8)Tm to (0.6-0.5)T m. Such processing results in a step-by-step structure refinement: a coarse-grained macroduplex type structure transforms to a microduplex one (d=1-3μm) and then to a nanoduplex structure (d=0.5–0.05μm). The paper considers examples of production of complex profile turbine engines components from materials with a microduplex type structure and shows the possibility for applying semi-finished products with a nanoduplex type structure in advanced manufacturing procedures of pneumatic forming and pressure welding under low temperature superplasticity (LT SP) conditions.

superalloys

Severe Thermomechanical Processing as an Effective Method for Preparation of Bulk and Sheet Nanostructured Semifinished Products from Nickel Alloys 718 and 718plus