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ECONOMIC AND RELIABLE TURBINE BLADING BY LOW COST SINGLE CRYSTAL ALLOY, CASTING PROCESS AND NON DESTRUCTIVE TESTING

Objective


Material

MC2 as Re-free alloy proved to be competitive to Re-containing alloys up to 1.100 C, with significantly lower material costs, oxidation resistance of MC2+ proved to be excellent.

Casting process

The process, based on natural cooling, proved to be suitable for standard furnaces, in particular for DS-structures (multiple grains) and components up to 200 mm long. Engine tests will be performed.

NDT method

Turbomeca's work resulted in significant progress in understanding the interactions of e.g. spurious grains and X-rays wall thickness effects covered by their CRISTAL AND REFOCALISATION-system. Automatisation is still an objective to be dealt with.
The availability of affordable and reliable single crystal components for high temperature applications, in particular in gas turbines, is an essential aspect for competitive engines. New approaches are necessary to reduce the costs of these components, which are still to high for certain applications.

This project consists of three complementary objectives which combined will significantly decrease costs of single crystal components with high performance potential.

The first objective is to improve the performance of the single crystal material by careful balancing of conventional Ni-base alloy chemistry (rather than following the conventional method of adding extremely expensive elements like Re).

The second objective is to significantly lower production costs by utilizing conventional vacuum casting furnaces available even in smaller investment foundries and by reducing cycle times. Process parameters will be controlled by mould design rather than by heating/cooling devices.

The third objective is to lower quality assurance costs for detecting orientation and grain structure defects by simultaneously increasing the reliability of quality control test results.

Coordinator

MTU AERO ENGINES GMBH
Address
Dachauer Strasse, 665
Muenchen
Germany

Participants (6)

Calcom SA
Switzerland
Address
Bellerive 34
1007 Lausanne
Gebruder Sulzer Aktiengesellschaft
Switzerland
Address

8401 Winterthur
Office National d'Études et de Recherches Aérospatiales (ONERA)
France
Address
29 Avenue De La Division Leclerc
92322 Châtillon
Precicast SA
Switzerland
Address
Via Resiga
6883 Novazzano
Société Turbomeca
France
Address

64320 Bordes
Thyssen Guss AG
Germany
Address
Bessemerstraße 80
4630 Bochum