Udimet D-979 Sheet

An iron-nickel alloy designed for turbine disc applications at temperatures up to 1200–1400°F (649–760°C). Hardened by a complex precipitation of intermetallic phases, the alloy combines corrosion resistance with excellent tensile and stress rupture strength.STANDARD PRODUCT FORMSForging billet and bar.MAJOR SPECIFICATIONSUNS N09979, AMS 5746LIMITING CHEMICAL COMPOSITION, %LimitingCr......14.0 – 16.0Fe ...........BalanceMo .........3.0 – 4.5W ...........3.0 – 4.5Ti ...........2.7 – 3.3Al ........0.75 – 1.3Ni ......42.0 – 48.0C ..........0.08 max.Si .........0.75 max.Mn .......0.75 max.B ...0.008 – 0.016PHYSICAL CONSTANTS AND THERMAL PROPERTIESDensity, Ib/in3........................................................................0.296g/cm3.........................................................................8.19Melting Range, °F...................................................2225 –2530°C ...................................................1220– 1390Coefficient of Expansion, 70 – 200°F, 10-6in/in • °F......7.6021 – 93°C, µm/m • °C ............13.7Thermal Conductivity, Btu • in/ft 2 • h • °F..............................87W/m • °C ..........................................12.6TYPICAL MECHANICAL PROPERTIES