caa a22 4500 463231201 CHVBK 20180405153242.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-0650-2 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0650-2 Mechanical response of nanocrystalline steel obtained by mechanical attrition [Elektronische Daten] [R. Rodríguez-Baracaldo, J. Benito, J. Cabrera, J. Prado] The mechanical properties of bulk specimens of nanocrystalline 0.55% C steel with a grain size of 30nm and a relative density higher than 97% have been determined. Samples were obtained by cold compaction and warm sintering at 425°C of nanocrystalline powders obtained by mechanical attrition in a planetary ball mill. In both processes an Ar protective atmosphere was used in order to avoid oxygen contamination. X-ray diffraction (XRD) and Transmission electron microscopy (TEM) analysis indicated that a volume-averaged grain size of 30nm is maintained after the warm consolidation processes. TEM studies also showed equiaxed ferrite with no dislocations inside the grains. However, the grain size distribution was no homogeneous as large grains of 100nm were observed. An average hardness of 8.5GPa was obtained, in good agreement with other bulk specimens of nanocrystalline Fe or eutectoid carbon steel prepared by other authors. Compression tests of bulk specimens at a strain rate of 10−4s−1 showed a compression strength near 2,500MPa with an absolute lack of ductility. Nanoindentation measurements at room temperature provided a strain rate sensitivity parameter of 0.012, indicating that the deformation mechanism is somehow governed by diffusion mechanisms. Springer Science+Business Media, LLC, 2006 Rodríguez-Baracaldo R. Departament of Engineering, Universidad Nacional de Colombia, Campus la Nubia, Manizales, Colombia aut Benito J. Department of Materials Science and Metallurgy, EUETIB, Technical University of Catalonia (UPC), Comte d'Urgell 187, 08036, Barcelona, Spain aut Cabrera J. Centre Tecnològic de Manresa, CTM, Av. Bases de Manresa 1, 08240, Manresa, Spain aut Prado J. Centre Tecnològic de Manresa, CTM, Av. Bases de Manresa 1, 08240, Manresa, Spain aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1757-1764 0022-2461 42:5<1757 2007 42 10853 https://doi.org/10.1007/s10853-006-0650-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0650-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rodríguez-Baracaldo R. Departament of Engineering, Universidad Nacional de Colombia, Campus la Nubia, Manizales, Colombia aut NATIONALLICENCE 700 1- Benito J. Department of Materials Science and Metallurgy, EUETIB, Technical University of Catalonia (UPC), Comte d'Urgell 187, 08036, Barcelona, Spain aut NATIONALLICENCE 700 1- Cabrera J. Centre Tecnològic de Manresa, CTM, Av. Bases de Manresa 1, 08240, Manresa, Spain aut NATIONALLICENCE 700 1- Prado J. Centre Tecnològic de Manresa, CTM, Av. Bases de Manresa 1, 08240, Manresa, Spain aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1757-1764 0022-2461 42:5<1757 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer