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4. Hot rotors
4.1 Choice of materials
The materials selected for hot compressor and turbine rotor discs must have high mechanical strength properties: burst strength, low-cycle fatigue strength (disc bore) and creep-elongation strength (disc rim), over a temperature range from 450 ˚C for the first disc, up to 700 ˚C for the last high-pressure compressor disc or high-pressure turbine disc.
The alloys chosen by engine manufacturers are exclusively from the nickel superalloy family (table 2 ), and are processed by hot forging, which enables the development of fine, fatigue-resistant microstructures. These nickel-matrix alloys are both strengthened by solid solution (Co, Cr, Mo, Hf...), for creep resistance, and by...
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Hot rotors
Bibliography
References
Standardization
- Aerospace series – Welded and brazed assemblies for aerospace construction – Weldability and solderability of materials – Part 10: General information. - NF L06-380-10 - 2-03
- Aerospace series – Welded and brazed assemblies for aerospace construction – Weldability and solderability of materials – Part 20: homogeneous assemblies of aluminum and aluminum alloys. - NF L06-380-20 - 2-03
- Aerospace series – Welded...
Tuboreactor manufacturers
(non-exhaustive list)
SNECMA (SAFRAN Group) http://www.snecma.com
General Electric http://www.ge.com
...
Research centers
(non-exhaustive list)
Edison Welding Institute (EWI) http://www.ewi.org
Welding Institute (IS Group) http://www.isgroupe.com
TWI (The Welding Institute) http://www.twi.co.uk
...Standards bodies
American Welding Society (AWS) http://www.aws.org
Bureau de normalisation de l'aéronautique et de l'espace (BNAE) (French Aerospace Standardization Bureau) http://www.bnae.asso.fr
European Association of aerospace industries (AECMA)...
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