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

Autor(es)

Almeida Junior, D. R. ^[1] ; Zilnyk, K. D. ^[2] ; Raabe, D. ^[3] ; Sandim, H. R. Z. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, EEL, Lorena Sch Engn, BR-12602810 Lorena, SP - Brazil

^[2] ITA, BR-12228900 Sao Jose Dos Campos, SP - Brazil

^[3] MPI E, D-40237 Dusseldorf - Germany

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF NUCLEAR MATERIALS; v. 516, p. 185-193, APR 1 2019.
• Citações Web of Science: 0

Resumo

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. (C) 2019 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/23304-8 - Influência de parâmetros de austenitização na transformação martensítica e nas relações de orientação gama/alfa-linha em aços ferrítico-martensíticos para uso nuclear
• Beneficiário: Kahl Dick Zilnyk
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/19197-9 - Estudo comparativo da transformação martensítica nos aços Eurofer-97 e ODS-Eurofer para uso em fusão nuclear
• Beneficiário: Hugo Ricardo Zschommler Sandim
• Linha de fomento: Auxílio à Pesquisa - Regular