Microstructural and mechanical characteristics of EUROFER'97 processed by equal channel angular pressing

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EUROFER'97 was processed by equal channel angular pressing (ECAP) at 823 K for a total of 4 or 8 passes, using a die angle of 105°, and its microstructure and tensile behavior in temperature range 568 873 K investigated. A single ECAP pass developed a deformation texture {1 1 0} 〈0 1 1〉 that was practically stable during subsequent ECAP passes. The materials processed by 1 or 2 passes exhibited a fine microstructure of recovered subgrains and tensile behavior very similar to that for the tempered material in the as-received condition. The materials processed using 4 or 8 passes exhibited nearly equiaxial submicron grained structures with a high density of high-angle grain boundaries. These materials became softer than the as-received material at a testing temperature of ~8764;823 K. EUROFER ECAP processed under the present conditions exhibited hardening ratio somewhat higher than that of the as-received material.
Proceedings of : 14th International Conference on Fusion Reactor Materials (ICFRM-14), 6-11 september, 2009. Sapporo Convention Center Sapporo, Japan.
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Journal of Nuclear Materials 417 (2011) 1-3, pp. 20–24