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Special Metals UDIMET® alloy D-979 Fe-Ni Alloy
Categories: Metal; Nonferrous Metal; Nickel Alloy

Material Notes: UDIMET® alloy D-979 (UNS N09979) is 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.

Information Provided by Special Metals Corporation

Key Words: UNS N09979; AMS 5746
Vendors: Visit metalmen for your metals needs. Products include special chemistry, tight tolerances, custom tempers, odd dimensions/forms, and small quantities. Phone 1-800-767-9494.

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Physical PropertiesOriginal ValueComments
Density 8.19 g/cc
 
Mechanical PropertiesOriginal ValueComments
Rupture Strength 69.0 MPa
@Temperature 871 °C,
Time 3.60e+6 sec
 145 MPa
@Temperature 816 °C,
Time 3.60e+6 sec
 250 MPa
@Temperature 760 °C,
Time 3.60e+6 sec
 380 MPa
@Temperature 704 °C,
Time 3.60e+6 sec
 515 MPa
@Temperature 649 °C,
Time 3.60e+6 sec
 
Thermal PropertiesOriginal ValueComments
CTE, linear 13.7 µm/m-°C
@Temperature 93.0 °C
Thermal Conductivity 12.6 W/m-K
Melting Point 1220 - 1390 °C
Solidus 1220 °C
Liquidus 1390 °C
 
Component Elements PropertiesOriginal ValueComments
Aluminum, Al 0.75 - 1.3 %
Boron, B 0.0080 - 0.016 %
Carbon, C <= 0.080 %
Chromium, Cr 14 - 16 %
Iron, Fe 20.804 - 34.542 %Balance
Manganese, Mn <= 0.75 %
Molybdenum, Mo 3.0 - 4.5 %
Nickel, Ni 42 - 48 %
Silicon, Si <= 0.75 %
Titanium, Ti 2.7 - 3.3 %
Tungsten, W 3.0 - 4.5 %

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