Microstructural characterization of the ODS Eurofer 97 EU-batch

• Author(s): Mateus, R. ; Carvalho, P. A. ; Nunes, D. ; Alves, L. C. ; Franco, N. ; Correia, J. Brito ; Alves, E.
• Date: 2010
• Persistent ID: http://hdl.handle.net/10400.9/1145
• Origin: Repositório do LNEG
• Subject(s): ODS RAFM steel; Chemical composition; Microstructure studies
• Document Type: Conference Object
• Language: English

Description

Four as-processed forms (Plate 16, Plate 6, Rod 20 and Rod 12.5) of the ODS Eurofer 97 EU-batch produced under different thermomechanical conditions have been investigated by scanning nuclear microprobe, scanning and transmission electron microscopy, energy dispersive X-ray spectroscopy, electron backscattered diffraction, hightemperature X-ray diffraction and microhardness measurements. The materials presented a ferritic microstructure with a homogeneous distribution of Y. The thicker plate presented a fine carbide dispersion while the other forms showed carbide morphologies corresponding to pseudo-pearlitic and pseudo-bainitic transformations with wellmatched hardness values. Hot rolling induced crystallographic textures of the {101}<101> type, rotary swaging resulted in a complex texture, and extrusion produced a strong <101> fiber texture. X-ray diffraction experiments at high temperature showed that at a cooling rate of 5 ºC/min the complete austenite-to-ferrite transformation occurs between 760 and 750 ºC compromising the material quenchability.