Reconstructing the austenite parent microstructure of martensitic steels: A case study for reduced-activation Eurofer steels

Almeida Junior, D.R. and Zilnyk, K.D. and Raabe, D. and Sandim, H.R.Z.

Volume: 516 Pages: 185-193
DOI: 10.1016/j.jnucmat.2019.01.022
Published: 2019

A computer program was employed to reconstruct the parent microstructure from electron backscatter diffraction maps taken from martensite. The reconstruction is based on a given user-selected orientation relationship. Two reduced-activation ferritic-martensitic Eurofer steels were austenitized for several times and cooled down at different rates. Two parameters are proposed to assess the quality of the reconstruction: the relative frequency of orientations in a determined sub-portion of the Euler space and the distribution of the angular deviation from a given theoretical orientation relationship. The number of active martensitic orientation variants during the transformation depends on grain size. Coarser grains enable a greater number of active variants improving the reconstruction quality. The distributions of angular deviations reveal that the Greninger-Troiano orientation relationship is the one that best describes the martensitic transformation in both steel grades. © 2019 Elsevier B.V.

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