Institute for Applied Materials – Materials Science and Engineering

Development and characterization of austenitic nanocluster ODS steels for high temperature applications

Dipl.-Ing. Sascha Seils

Motivation

A main aspect of modern energy supply is the efficient and environmental production and conversion of energy, as well as its storage. Conventional high temperature steels are applicable at temperatures up to about 600 °C. Increasing the working temperature of power stations would raise the degree of effectiveness and decrease CO2 emission at the same time. Investigations on ferritic Oxide Dispersion-Strengthend (ODS) steels already exhibit improved mechanical properties at high temperatures. Further improvements are expected by the introduction of oxide particels in austenite, a phase with superior strength, creep and oxidation behavior in comparison with ferrite. Another interesting property of austenitic ODS steels might be their good irradiation resistance which make them a possible candidate for applications in fusion reactors in the future.

Goals

  • production of a austenitic ODS steel by powder metallurgy route in cooperation with the partners of the project
  • understanding of the formation of so-called nanoclusters and their evolution during the material’s production
  • collection of empirical values for adaptation of the ODS steel to given requirements
  • investigation of the formation of nanoclusters in dependence of different alloying elements

Techniques

  • parameter study on the synthesis of an austenitic ODS steel by powder metallurgy route
  • microstructural characterization of the ODS steel by scanning electron microscopy and transmission electron microscopy
  • characterization of oxide nanoclusters by 3D atom probe tomography
  • evaluation of the microstructural development at high temperatures and under ion irradiation