Special Metals UDIMET® alloy D-979 Fe-Ni Alloy

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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
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Physical Properties	Metric	English	Comments

Density	8.19 g/cc	0.296 lb/in³

Mechanical Properties	Metric	English	Comments
Rupture Strength	69.0 MPa @Temperature 871 °C, Time 3.60e+6 sec	10000 psi @Temperature 1600 °F, Time 1000 hour
	145 MPa @Temperature 816 °C, Time 3.60e+6 sec	21000 psi @Temperature 1500 °F, Time 1000 hour
	250 MPa @Temperature 760 °C, Time 3.60e+6 sec	36300 psi @Temperature 1400 °F, Time 1000 hour
	380 MPa @Temperature 704 °C, Time 3.60e+6 sec	55100 psi @Temperature 1300 °F, Time 1000 hour
	515 MPa @Temperature 649 °C, Time 3.60e+6 sec	74700 psi @Temperature 1200 °F, Time 1000 hour

Thermal Properties	Metric	English	Comments
CTE, linear	13.7 µm/m-°C @Temperature 93.0 °C	7.61 µin/in-°F @Temperature 199 °F
Thermal Conductivity	12.6 W/m-K	87.4 BTU-in/hr-ft²-°F
Melting Point	1220 - 1390 °C	2230 - 2530 °F
Solidus	1220 °C	2230 °F
Liquidus	1390 °C	2530 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	0.75 - 1.3 %	0.75 - 1.3 %
Boron, B	0.0080 - 0.016 %	0.0080 - 0.016 %
Carbon, C	<= 0.080 %	<= 0.080 %
Chromium, Cr	14 - 16 %	14 - 16 %
Iron, Fe	20.804 - 34.542 %	20.804 - 34.542 %	Balance
Manganese, Mn	<= 0.75 %	<= 0.75 %
Molybdenum, Mo	3.0 - 4.5 %	3.0 - 4.5 %
Nickel, Ni	42 - 48 %	42 - 48 %
Silicon, Si	<= 0.75 %	<= 0.75 %
Titanium, Ti	2.7 - 3.3 %	2.7 - 3.3 %
Tungsten, W	3.0 - 4.5 %	3.0 - 4.5 %

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