Udimet 500

General characteristics of The Udimet Alloys

These are precipitation-hardenable nickel-based superalloys that were developed to give outstanding high-temperature strength, creep strength and corrosion resistance. The alloys show good toughness after long exposure to high temperatures.

Udimet 500 and 700 have effectively been superseded by types 520 and 720, and are no longer listed by Special Metals Corp. Who in fact invented them.

The alloys are very suitable for forging.

Chemical Analysis Udimet 500
(nominal)
Udimet 520 Udimet 700
(nominal)
Udimet 720
C% 0.1 .02 – .06 0.1 0.1 – .02
Cr% 18.0 18.0 – 20.0 15.0 15.5 – 16.5
Co% 18.5 11.0 – 14.0 18.5 14.0 – 15.5
Mo% 4.0 5.5 – 7.0 5.2 2.75 – 3.25
Ti% 3.0 2.0 – 3.25 3.5 4.75 – 5.25
Al% 3.0 1.8 – 2.3 4.3 2.25 – 2.75
W% 0.8 – 1.2 1.0 – 1.5
B% .004 – .010 .01 – .02
Zr% .025 – .05
Ni% bal bal bal bal

The analyses of Udimets 500 and 700 are shown to illustrate the chemistry changes involved in the development of Udimets 520 and 720.

Applications

Udimet 520 was developed for use at 1400/1700ÂşF (760/925ÂşC) and its primary applications are in blading for aircraft and land-based gas turbines.

Udimet 720 is used primarily in gas-turbine blade and disc applications.

Forging

These alloys would be forged between 2150/2200ºF and 1900/1925ºF – 1175/1205ºC and 1035/1050ºC.

Heat treatment

The alloys are solution treated at 2025ÂşF (1105ÂşC) and to give required mechanical properties normally undergo aging treatments at 1550ÂşF (845ÂşC) for 24h and 1400ÂşF (760ÂşC) for 16h.

Machinability

The alloys are not easy to machine due to their high strength and work hardening rates, and gumminess is likely to occur. Overpowered machinery and positive feeds are necessary to ensure efficient machining and good surface finish.

Weldability

In the event that welding is required for applications of these alloys, which it seldom is, gas-tungsten-arc welding is recommended with a filler metal of Inconel 718, 725NDUR or 617.

 

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