AFM for diagnosis of nanocrystallization of steels in hardening processes (Articolo in rivista)

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  • AFM for diagnosis of nanocrystallization of steels in hardening processes (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Pompeo G., Girasole M., Longo G., Cricenti A., Bailo D. Ronci F. Maras A., Serracino M., Moretti P. F. (2008)
    AFM for diagnosis of nanocrystallization of steels in hardening processes
    in Journal of microscopy (Online)
    (literal)
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  • Pompeo G., Girasole M., Longo G., Cricenti A., Bailo D. Ronci F. Maras A., Serracino M., Moretti P. F. (literal)
Pagina inizio
  • 218 (literal)
Pagina fine
  • 223 (literal)
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  • 230 (literal)
Rivista
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  • http://dx.doi.org/10.1111/j.1365-2818.2008.01978.x (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • CNR, Ist Struttura Mat, I-00133 Rome, Italy CNR, Ist Geol Ambientale & Geoingn, I-00133 Rome, Italy Univ Roma La Sapienza, Dipartimento Sci Terra, I-00133 Rome, Italy Ist Tecn Ind Statale E Fermi, I-00135 Rome, Italy (literal)
Titolo
  • AFM for diagnosis of nanocrystallization of steels in hardening processes (literal)
Abstract
  • Introduction: The aim of this study is to investigate the nanocrystallization of steels caused by the transformation from the austenitic to the martensitic phase induced by a severe plastic deformation (SPD) treatment. In this framework, we applied an air blast shot peening treatment, which is a simple protocol widely used for industrial purposes. Methods: AISI 286 and AISI 316 specimens were peened for different times and polished using diamond pastes in order to remove corrugations higher than 1 mu m. The characterization of the steel surfaces was performed by atomic force microscopy (AFM) operating in contact mode. Additional EDXD measurements were performed to confirm the phase transition. Results and Discussion: An AFM-based characterization at nanometric level of the steel surfaces is provided. When the peening exceeds a threshold time that, as expected, depends on the steel composition, a uniform nanostructuration is detected. It is well known that such rearrangement is associated to the growth of a martensitic phase. To date, AFM has been employed in this field only for few applications and to solve specific problems. On the other hand, our results demonstrate that this is a useful technique for the characterization of hardened surfaces, especially when non-destructive sample preparation treatments are required. Moreover, we show that AFM can be a useful tool also for in situ industrial diagnostics of metallic parts. (literal)
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