René 80 is a General Electric trademark cast nickel-base precipitation-hardening superalloy and one of the most widely used and best-documented alloys in the René family. It has been produced by investment precision casting for jet-turbine and industrial gas-turbine blades for decades, with a long-term service temperature rating around 950°C, and remains a benchmark alloy against which newer cast turbine blade grades (including its own successor, René 125) are routinely compared.

Strengthening is provided by a substantial gamma-prime, Ni3(Al,Ti), precipitate volume fraction from the combined aluminum and titanium additions, with chromium providing oxidation and hot-corrosion resistance and molybdenum plus tungsten contributing solid-solution strengthening and creep resistance. In service, René 80 blades must withstand creep in tension and compression, low- and high-cycle fatigue, and hot corrosion/oxidation simultaneously — published rupture data shows 350 MPa for 100 hours at 870°C, dropping to roughly 160 MPa for 100 hours at 980°C, illustrating the alloy's strength retention deep into the turbine's operating temperature range.

As a cast, fully gamma-prime-strengthened turbine blade alloy, René 80 presents the classic difficult-to-machine nickel-superalloy profile in its most concentrated form. Low thermal conductivity concentrates cutting heat at the tool-chip interface rather than clearing it in the chip, and the combined titanium, aluminum, molybdenum, and tungsten content keeps the alloy strong and hard well past the temperature range where a plain carbon steel would soften — so cutting forces and edge temperatures both stay elevated as speed increases rather than easing off.

Work hardening is severe: any rubbing, hesitation, or light interrupted cut immediately hardens the surface layer under mechanical and thermal stress, so a consistent, adequate chip load without dwelling is critical to stay ahead of the hardening front. As a cast structure, René 80 also carries carbide and other secondary-phase particles distributed through the grain boundaries, adding localized abrasive wear on top of the base alloy's already-high hardness.

Nickel's chemical affinity for common tool substrates promotes galling and built-up edge, tearing the finished surface if the cutting edge is not kept sharp and properly honed. Rigid, low-deflection setups, sharp positive-rake carbide with a fine, uniform edge hone, and continuous, well-directed coolant are essential — treat René 80 as one of the more demanding grades in the cast René family and favor the conservative end of the recommended speed range.