CD Laboratory for Material Mechancis of High Performance Alloys

Research activities are focussed on the influence of microstructure on the mechanical properties of special materials and components. Of particular interest are high-performance alloys and the processes involved in their manufacture.

To optimise the use of materials, key quality characteristics such as the desired mechanical properties, the surface quality or the residual stress state of materials and components must be specifically controlled during production. This is only possible with precise knowledge of the microstructure and its influence on the mechanical properties of the materials. These are investigated and analysed in detail. The focus is on high-performance alloys for sheet metal applications, such as multiphase steels. Forging applications with nickel or titanium-based alloys are also of interest. Alloys that are used in tools for forming processes are also analysed.

The processes that take place during the production and processing of the alloys are a key aspect in the characterisation of the materials and their properties. These processes are central to the changes in material properties. The materials are adapted and optimised with the help of thermal effects, mechanical loads and deformations. The changes and developments of the material in the different processing phases and under the different conditions are analysed.

The research work is predominantly experimental. Among other things, single-axis and multi-axis deformation experiments are used. These include, for example, the hole expansion test, which provides parameters for describing the properties of thin sheets. Each phase of the test includes a detailed analysis of microstructural variables and an estimation of the residual stress state of the material. In this way, suitable parameters are identified that allow statements to be made about the formability, damage and fracture behaviour of the alloys.

Based on the deformation behaviour of the various microstructure components (continuum mechanics), the knowledge gained from the investigations can be used to create models that enable the production process to be optimised.

The data from the research experiments is incorporated into mathematical models and simulations. Both application-related research and basic research focus primarily on materials, components and manufacturing processes that are already being used in industry or are planned for the near future. Last but not least, optimised high-performance alloys are used in automotive and aircraft construction.