Dresden 2017 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 6: Structural Materials
MM 6.2: Vortrag
Montag, 20. März 2017, 10:30–10:45, IFW D
Micromechanical behavior in dependence of the microstructure of nickel-based superalloys — •Robert Lawitzki1, Jonas Woste2, Michael Hofmann3, Christian Krempaszky2, Di Wang4, Guido Schmitz1, and Julia Wagner1 — 1Universität Stuttgart, Institut für Materialwissenschaft, 70569 Stuttgart — 2TU München, Lehrstuhl für Werkstoffkunde und Werkstoffmechanik, 85748 Garching — 3TU München, FRM II, 85747 Garching — 4KIT, Institut für Nanotechnologie (INT), 76344 Eggenstein-Leopoldshafen
Nickel-based superalloys have a huge field of applications, particularly in the high-temperature regions of gas turbines. For those applications the reliable knowledge of residual stresses on different length scales is crucial since they affect the material properties strongly. Beside macroscopic stresses, which influence directly the life time of components, intergranular strains should be taken into account as well, since they always superpose the macroscopic stress state. Those type II stresses, which reflect the micromechanical material behavior, are strongly dependent on the microstructure of the samples.
In this contribution, we present results of mechanical in-situ neutron diffraction tests on the two nickel-based superalloys Inconel 718 and Haynes282. Our data show, that the micromechanical behavior and thus the mechanisms of plastic deformation differ for IN718 and Haynes282. The neutron diffraction results will be discussed in detail with respect to the different observed microstructures, which were characterized in detail by means of electron microscopy like SEM and TEM.