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.
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.
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.