Xabier Mikel Turrillas Maisterra
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Artigo IPEN-doc 23790 The use of X-ray diffraction for phase identification of press hardened steels2015 - COUTO, C.P.; COSTA, P.D.O.L.; MARTINEZ, L.G.; TURRILLAS, X.; ROSSI, J.L.The numbers of hot stamped components have been steadily increasing in the automotive industry. Press hardened steels are generally used in hot stamping process since at the end of the process, the steel may achieve a tensile strength about 1500 MPa. The hot stamping process consists to heat the steel blank at total austenitization temperature and to transfer the blank into the press tooling for shaping and fast cooling to fully martensitic transformation. The transfer of the blank from the furnace to the press might promote at some extent, steel oxidation. The application of metallic coatings avoids this hindrance. The Al-Si has been the most applied coating on steel. In parallel, alternative coatings such as Zn-Ni have been developed. It is known that the heating causes chemical elements diffusion, which results in intermetallic formation between the elements presents in the coating and in the substrate. This study had the objective of characterizing hot stamped and coated 25MnB5 steel samples with Al-Si and Zn-Ni, with X rays diffraction (XRD) technique. Some literature suggested phases such as Zn-Fe, Zn-Ni-Fe or Al-Fe-Si were not seen on XRD results. Nonetheless, X-ray diffraction detected the presence of ZnO and α-Fe for Zn-Ni coated steel plate and Al5Fe2, AlFe3 and α-Fe for the Al-Si coated steel plate.Artigo IPEN-doc 22321 Synchrotron diffraction characterization of alternative powder diffraction standards2014 - MARTINEZ, L.G.; ICHIKAWA, R.U.; IMAKUMA, K.; ORLANDO, M.T.D.; TURRILLAS, X.Artigo IPEN-doc 22319 Size-strain x-ray line profile analysis and crystallite size distribution of nanostructured ZnO2013 - ICHIKAWA, R.U.; MARTINEZ, L.G.; IMAKUMA, K.; TURRILLAS, X.; GUSATTI, M.; RIELLA, H.G.Artigo IPEN-doc 20764 Size-strain analysis in RE-doped KY3F10 fluorides using X-ray line profile analysis2014 - ICHIKAWA, R.U.; MARTINEZ, L.G.; IMAKUMA, K.; LINHARES, H.M.S.M.D.; RANIERI, I.M.; TURRILLAS, X.Artigo IPEN-doc 20628 Development of a methodology for the application of the Warren-Averbach method2014 - ICHIKAWA, R.U.; MARTINEZ, L.G.; IMAKUMA, K.; TURRILLAS, X.