Udimet 700 (W.Nr./DIN 2.4636, DIN designation NiCo15Cr15MoAlTi, SAE/AISI 687, AFNOR NCKD20AT) is one of the most widely used nickel-cobalt-chromium wrought superalloys in gas turbine hot-section engineering. It is precipitation-hardened by gamma-prime (γ') formed from its combined aluminum and titanium content, with a high cobalt addition providing further high-temperature strength and phase stability, and molybdenum contributing solid-solution strengthening. This combination gives Udimet 700 excellent high-temperature strength, superior creep resistance, and high stress-rupture strength.

Udimet 700 is used extensively for turbine disks and blades in jet engines, where it must sustain high stresses at temperatures up to roughly 760°C (1400°F) over long service life. It is normally supplied in wrought condition, though it can also be gas-atomized into pre-alloyed powder and consolidated by hot isostatic pressing for powder-metallurgy turbine disk applications. Its stable microstructure, good weldability relative to other high-strength Ni superalloys, and decades of production history make it one of the better-documented grades in this material family.

Udimet 700 is a demanding cut, consistent with its role as a high-strength turbine disk and blade alloy. Its low thermal conductivity means heat generated at the cutting edge concentrates at the tool-chip interface rather than dissipating into the chip, accelerating crater wear and edge deformation. The alloy work-hardens rapidly under cutting forces, so any hesitation, rubbing, or interrupted engagement at the cutting edge creates a hardened surface layer that is significantly tougher to cut on the next pass - maintaining a constant, adequate chip load throughout the cut is essential.

Udimet 700's high combined aluminum and titanium content produces a substantial gamma-prime fraction, and the alloy retains much of its room-temperature strength and hardness at the elevated temperatures generated during cutting. Tool edges stay under heavy mechanical load even as heat builds, which drives notching and edge chipping if speeds are pushed too aggressively, and the alloy's chemical affinity for common tool materials makes it prone to galling and built-up edge. Rigid setups, sharp and properly honed positive-rake carbide grades suited to superalloys, moderate-to-low cutting speeds, and consistent, generous coolant delivery are the standard countermeasures for this alloy family.