Multiscale Crack Regeneration – Application of Selective Single Crystal Repair Welding on High Pressure Turbine Blades (T23#)

• Subject Area: Materials in Sintering Processes and Generative Manufacturing Processes ; Mechanical Properties of Metallic Materials and their Microstructural Origins ; Thermodynamics and Kinetics as well as Properties of Phases and Microstructure of Materials
• Term: since 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 119193472

The objective of this transfer project is the transfer of single-crystal (SX-) repair from subproject B5 to crack patterns, both in the oxidized and in the non-oxidized state, in use of an identical powder material. The crack patterns are multiscaled and artificially applied to the tips of high-pressure turbine blades and to high-pressure shrouds. In addition, the mentioned SX-repairs are mechanically characterized in a hot tensile test. With these two key areas of investigation, the SX repair is expanded to include new alloys, material conditions and components from flight operations without prior dissimilar repairs.

• DFG Programme: Collaborative Research Centres (Transfer Project)
• Subproject of: SFB 871: Regeneration of Complex Capital Goods
• Applicant Institution: Gottfried Wilhelm Leibniz Universität Hannover
• Business and Industry: MTU Maintenance Hannover GmbH; Luftfahrt, Maschinenbau; Dr. Frank Seidel
• Project Heads: Professor Dr.-Ing. Stefan Kaierle; Professor Dr.-Ing. Volker Wesling