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Udimet 500 and 700 have effectively been superseded by types 520 and 720, and are no longer listed by Special Metals Corp.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 1400/1700ºF (760/925ºC) 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 2025ºF (1105ºC) and to give required mechanical properties normally undergo aging treatments at 1550ºF (845ºC) for 24h and 1400ºF (760ºC) 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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