Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 74: Structural Materials (Steels, light-weight materials, high-temperature materials)
MM 74.3: Vortrag
Freitag, 16. März 2018, 11:45–12:00, H 0106
Advanced microstructural characterization of nanoprecipitates in nickel-based superalloys — Robert Lawitzki1, Salman Ul-Hassan1, Lukas Karge2, Julia Wagner1, Michael Hofmann2, •Ralph Gilles2, and Guido Schmitz1 — 1Universität Stuttgart, Institut für Materialwissenschaft — 2TU München, FRMII
Nickel-based superalloys are high performance alloys that can be found in high temperature structural applications like aero and land-based gas turbine engines. Most important for the mechanical properties of these alloys is the presence of nanoprecipitates. The addition of elements like Al, Ti or Nb and a suited heat treatment are the requirement for their controlled precipitation. Finding the optimum heat treatment depends on the solubility of the nanoprecipitates and often requires associated studies by electron microscopy of small samples in the micrometer scale.
In this contribution, we present results of the microstructural characterization of differently heat treated nickel-based superalloys Inconel 718, which were further characterized by small angle neutron scattering (SANS). Information about the morphology - obtained by electron microscopy - and about the composition - obtained by atom probe tomography - of nanoprecipitates, are used as input parameters to simulate the SANS data. The obtained models give information about the volume fraction and size of precipitates in the mm-scale and can be further used for in situ neutron experiments during heat treatment or plastic deformation on bulk samples.