High temperature Materials
Prof. Dr.-Ing. Tilmann Beck
The group explores the complex interactions between mechanical properties, particularly isothermal and thermomechanical fatigue, and the microstructures of metallic high temperature materials such as Ni based alloys and martensitic 9-12% Cr steels. The focus is on the consequences of elastic and plastic anisotropy of fatigue damage of cast Ni based alloys as well as the time and load dependent evolution of microstructures during high temperature loadings. For fatigue testing, we apply servo-hydraulic systems capable of both, axial and superimposed push-pull / torsional loading. For microstructural analyses, we use light microscopy, and scanning electron microscopy (SEM), including electron backscatter diffraction (EBSD) and energy dispersive X-ray spectroscopy (EDX).
Analysis of the influence of hardening precipitates and their evaluation under operational conditions on the temperature-, time- and stress-dependent fatigue behaviour of high-temperature martensitic Cr steels and lave-phase hardened ferrites (BMU / DFG)
Experimental analysis and simulation using digital material twins of the elastic-plastic grain anisotropy of wrought Ni alloys (DFG) and cast Ni alloys (BMWK / AG-Turbo)
Analysis of the influence of mean stress, microstructure and temperature on the formation of fine grain zones (FGA) during ultra-high cycle fatigue of Cr-(Mo-) alloyed steels (DFG: applied for)
Probabilistic evaluation of the interaction of creep damage and high-cycle fatigue in conventionally solidified Ni-based casting alloys (BMWK / AG-Turbo)