D02: Application of orientation contrast microscopy for the investigations of phase transformations and plastic deformation

Belongs to:
TopicD: Characterisation

Orientation microscopy or orientation contrast microscopy on the basis of EBSD (electron backscatter diffraction) in the SEM or spot diffraction in the TEM is a powerful technique for comprehensive microstructure characterization. The technique allows studying a wide range of crystalline materials and a large number of microstructure formation processes. In this symposium we will focus on two particular fields of application of this technique, namely the study of phase transformation microstructures and that of deformation microstructures. Contributions are welcome, for example, on the measurement of plastic strain, the determination of dislocation densities, or the effect of grain boundaries on the micro-mechanisms of deformation. In the field of phase transformation we invite orientation microscopy-based investigations on diffusive and displacive transformations.

A special place in this symposium will be reserved for investigations on the development and application of crystallographic techniques that allow reconstructing the parent phase microstructure from an orientation contrast map (EBSD map) of the product phase. These methods are of particular importance for better understanding of the deformation and phase transformations in hot-rolled high-strength steels, titanium alloys and other metallic materials that exhibit a martensitic, bainitic or other phase transformations with well-defined orientation relations between the phases. By dedicated crystallographic software, it is possible to reveal the parent austenite structure with a resolution that cannot be matched by traditional metallographic techniques. The progress in this field is expected to contribute to a more accurate control of the thermo-mechanical controlled processing of high strength steels, for example.

Wednesday (28.09.2016)