About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Characterization of Minerals, Metals and Materials 2022
|
Presentation Title |
Single Crystal Cast Microstructures Characterized by the RVB-EBSD Method |
Author(s) |
Pascal Thome, Felicitas Scholz, Jan Frenzel, Gunther Eggeler |
On-Site Speaker (Planned) |
Pascal Thome |
Abstract Scope |
We present the Rotation Vector Base Line Electron Back Scatter Diffraction (RVB-EBSD) method, a new correlative orientation imaging method for scanning electron microscopy (OIM/SEM). The RVB-EBSD method was developed to study crystal mosaicity in as-cast Ni-base superalloy single crystals (SX). The technique allows to quantify small deviation angles (< 0.5°) between individual dendrites and to visualize the results in an intuitive way. The RVB-EBSD method is based on a cross correlation procedure. It applies Gaussian band pass filtering to improve the quality of more than 500 000 experimental patterns. A rotation vector approximation and a correction procedure, which relies on a base line function, are used. As an example we apply the method to compare two superalloy microstructures. We study competitive growth of dendrites after directional solidification in a Bridgman furnace. We compare the results with microstructures obtained from single crystalline Ni-base superalloys additively manufactured by selective electron beam melting. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Temperature Materials, Additive Manufacturing |