Artículos de revistas
Evaluation of microstructure anisotropy on room and medium temperature ECAP deformed F138 steel
Fecha
2015-07Registro en:
de Vincentis, Natalia Soledad; Kliauga, A.; Ferrante, M.; Avalos, Martina Cecilia; Brokmeier, H. G.; et al.; Evaluation of microstructure anisotropy on room and medium temperature ECAP deformed F138 steel; Elsevier Science Inc; Materials Characterization; 107; 7-2015; 98-111
1044-5803
CONICET Digital
CONICET
Autor
de Vincentis, Natalia Soledad
Kliauga, A.
Ferrante, M.
Avalos, Martina Cecilia
Brokmeier, H. G.
Bolmaro, Raul Eduardo
Resumen
Abstract The microstructure developed during severe plastic deformation results in improved mechanical properties because of the decrease in domain sizes and accumulation of defects, mainly dislocation arrays. The characteristic deformation stages observed in low stacking fault energy (SFE) face centered cubic (FCC) materials are highly influenced by the development of the primary and secondary twinning that compete with dislocation glide. In this paper, a low SFE F138 stainless steel is deformed by equal channel angular pressing (ECAP) up to 4 passes at room temperature (RT) and at 300°C to compare the grain refinement and twin boundary development with increasing deformation. Tensile tests were performed to determine the deformation stages reached by the material before and after ECAP deformation, and the resulting microstructure was observed by TEM. X-ray diffraction and EBSD, average technique the first and local the second one, were used to quantify the microstructural changes, allowing the determination of diffraction domain sizes, dislocation and stacking fault densities and misorientation indices, which lead to a complete analysis of the deformation introduced in the material, with comparative correlations between various microstructural parameters.