Hartmut Baur

High-porosity titanium, stainless steel and superalloy parts

The production of highly porous parts from titanium, stainless steel, and nickel-based superalloys is of increasing interest in lightweight constructions. A new space-holder method uses carbamide (urea) and ammonium hydrogen carbonate to produce samples with porosities between 60 and 80 %. Depending on the shape and size distribution of the space holder, spherical and angular pores in the range of 0.1-2.5 mm were obtained.

Domestic object damage investigations on turbine blade material

Abstract Domestic Object Damage (DOD) is a problem, especially for compressor and turbine sections of jet engines. To investigate the influence on the performance and service life of the impacted components, well defined DOD impacts in the laboratory have been performed with consecutive metallurgical investigations and fatigue testing. The paper describes the efforts to upgrade the existing flat coil accelerator at the Fachgebiet Raumfahrttechnik (lrt) to the needs of the DOD tests and documents the experiment set up. Particles were shot on ideal flat specimens of Titanium Aluminides (γ-TiAl based alloys) under realistic service conditions simulating stress and/or temperature of the target. First experimental results are discussed.