Components made from superalloys are frequently used at temperatures between 600°C and 1200°C because nickel-based PM superalloys withstand high mechanical, chemical and thermal loads. Their excellent oxidation and corrosion resistance, together with improved stress-rupture and creep resistance above 700°C compared with other materials, are particularly advantageous.
The superiority of high-temperature-strength PM materials over forged superalloys is due to their higher volume fraction of the γ phase, finer microstructure and the resulting improved mechanical properties.
Typical applications for high-temperature-strength PM superalloys include high-performance engine parts, high-temperature machinery components for the chemical and petrochemical industries, and hot-working and forming tools for the diamond grinding wheel, glass and automotive industries.
Above 700°C, PM superalloys have a strength advantage over both cobalt-based hard alloys and cast or forged high-temperature-strength materials. This makes them well suited as high-temperature structural materials.
| Name | CR | Co | Mo | Al | Ti | Ni |
|---|---|---|---|---|---|---|
| Saratherm 2 | 15 | 18 | 5 | 4 | 3.5 | Balance |
| Saratherm 80 | 20 | 2 | / | 1.6 | 2 | Balance |
| Saratherm 90 | 20 | 18 | / | 1.5 | 2.5 | Balance |