Description

UDIMET D-979

UDIMET D-979 (UNS N09979)

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.

 

Physical Constants

Table 2 – Physical Constants

Density, lb/in³………………………………………………………… 0.296

g/cm³…………………………………………………………. 8.19

Melting Range, °F………………………………………….. 2225-2530

°C………………………………………….. 1220-1390

Coefficient of Expansion, 70-200°F, 10^-6 in/in•°F………….. 7.60

21-93°C, µm/m•°C………………. 13.7

Thermal Conductivity, Btu•in/ft²•h•°F…………………………… 87

W/m•°C…………………………………. 12.6

Typical Mechanical Properties

Table 3 – 1000-Hour Rupture Strength of Precipitation- Hardened UDIMET alloy D-979

Chromium………………………………………………………. 14.0-16.0

Molybdenum………………………………………………………. 3.0-4.5

Tungsten…………………………………………………………… 3.0-4.5

Titanium……………………………………………………………. 2.7-3.3

Aluminum………………………………………………………… 0.75-1.3

Nickel……………………………………………………………. 42.0-48.0

Carbon………………………………………………………….. 0.08 max.

Silicon…………………………………………………………… 0.75 max.

Manganese……………………………………………………. 0.75 max.

Boron…………………………………………………………. 0.008-0.016

Iron………………………………………………………………… Balance*

 

*Reference to the ‘balance’ of a composition does not guarantee this is exclusively of the element mentioned but that it predominates and others are present only in minimal quantities.

 

 

Available Products and Specifications

Temperature Rupture Strength °F °C ksi MPa 1200 649 75 515 1300 704 55 380 1400 760 36 250 1500 816 21 145 1600 871 10 69

UDIMET alloy D-979 is designated UNS N09979 and is available as forging billet and bar.

Major specifications: AMS 5746

Figure 1. Typical mechanical properties of precipitation-hardened UDIMET alloy D-979

Publication Number SMC-107 Copyright © Special Metals Corporation, 2004 (Sept 04)

UDIMET is a trademark of the Special Metals Corporation group of companies.