New Protocol for Orientation Reconstruction from Martensite to Austenite in Steels
43 Pages Posted: 20 Jun 2019 Publication Status: Accepted
Abstract
This work presents an approach for reconstructing the orientation of prior austenite using the martensite crystallography from an electron backscatter diffraction dataset. To optimize the accuracy and speed of reconstruction, the algorithm comprises three steps: orientation relationship refinement, orientation coalescence and regional voting. Martensitic stainless steel with/without retained austenite was used to demonstrate this approach. The reconstruction parameters can be determined theoretically or semi-theoretically in this algorithm. Moreover, mis-indexing near twinning boundaries of prior austenite is minimized in the regional voting process. Although some issues remain unsolved, this approach provides a balance between accuracy and efficiency in austenite reconstruction.
Keywords: prior austenite, reconstruction, martensitic phase transformation, steels, electron backscattering diffraction, orientation relationship
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