Abnormal grain growth in Eurofer-97 steel in the ferrite phase field

Autor(es)

Oliveira, V. B. ; Sandim, H. R. Z. ; Raabe, D.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF NUCLEAR MATERIALS; v. 485, p. 23-38, MAR 2017.
• Citações Web of Science: 11

Resumo

Reduced-activation ferritic-martensitic (RAFM) Eutofer-97 steel is a candidate material for structural applications in future fusion reactors. Depending on the amount of prior cold rolling strain and annealing temperature, important solid-state softening reactions such as recovery, recrystallization, and grain growth occur. Eurofer-97 steel was cold rolled up to 70, 80 and 90% reductions in thickness and annealed in the ferrite phase field (below approximate to 800 degrees C). Changes in microstructure, micro-, and mesotexture were followed by orientation mappings provided by electron backscatter diffraction (EBSD). Eurofer-97 steel undergoes abnormal grain growth above 650 degrees C and this solid-state reaction seems to be closely related to the high mobility of a few special grain boundaries that overcome pinning effects caused by fine particles. This solid-state reaction promotes important changes in the microstructure and Microtexture of this steel. Abnormal grain growth kinetics for each condition was determined by means of quantitative metallography. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/56436-0 - Encruamento, recuperacao e recristalizacao de um aco ferritico-martensitico (ods-eurofer) endurecido por dispersao de oxidos visando aplicacoes no reator de fusao nuclear iter.
• Beneficiário: Hugo Ricardo Zschommler Sandim
• Modalidade de apoio: Auxílio à Pesquisa - Regular