Project Details
Projekt
Energy-dispersive analysis of near surface residual stress and microstructure gradients by means of conventional laboratory X-ray sources
Subject Area
Mechanical Properties of Metallic Materials and their Microstructural Origins
Term
from 2014 to 2017
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 261596039
Concerning the analysis of near surface residual stress and structural gradients, energy-dispersive (ED) diffraction recently has become an interesting alternative to the well established angle-dispersive (AD) diffraction methods. The most important advantage of the ED method is that it provides complete diffraction patterns in fixed but arbitrarily selectable measuring directions which do not only contain integral information on composition, phase specific residual stresses, crystallographic texture and microstructure of the material, but also on the depth distribution of these properties. Further dissemination and opening up new fields of application, which would correspond to the high potential of the ED method are currently limited by the restricted access to synchrotron beamlines that are dedicated to energy-dispersive diffraction. Within the scope of this research project it is planned to transfer the ED method from synchrotron to laboratory dimensions. The objective is to create a scientific basis for a measuring and evaluation strategy which is adapted to the lab conditions being distinguished by a much lower photon flux and a larger beam divergence. The possibilities and limitations of the new approach are to be investigated by means of well-defined material conditions. Therefore, the main goal of the project is to exploit the features provided by ED diffraction in order to gain as much as possible information on the near surface material properties while simultaneously keeping the expenditure of time and instrumentation as small as possible.
DFG Programme
Research Grants
