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

作者：Oliveira V B; Sandim H R Z^*; Raabe D

来源：Journal of Nuclear Materials, 2017, 485: 23-38.

DOI：10.1016/j.jnucmat.2016.12.019

• Eurofer-97 steel
• Abnormal grain growth
• Mesotexture
• Electron backscatter diffraction (EBSD)

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.

• 出版日期2017-3