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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Bibliography

References

(1) - MORGAN (E.J.) - Atmospher Control Criteria for Welding Titanium - . Conference Proceedings from Advanced in Welding Processes, Harrogate (1978).
(2) - SMITH (L.S.), GITTOS (M.F.) - A Review of Weld Metal Porosity and Hydrid Cracking...

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...