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Novel approaches to determining residual stresses by ultramicroindentation techniques / E. Frutos in Acta materialia, Vol. 58 N° 12 (Juillet 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4191–4198 Titre : Novel approaches to determining residual stresses by ultramicroindentation techniques : Application to sandblasted austenitic stainless steel Type de document : texte imprimé Auteurs : E. Frutos, Auteur ; M. Multigner, Auteur ; J.L. González-Carrasco, Auteur Année de publication : 2011 Article en page(s) : pp. 4191–4198 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Sand  blasting  Microindentation  Austenitic  steels  Residual  stresses  Microstructure Résumé : This research addresses the determination of residual stresses in sandblasted austenitic steel by ultramicroindentation techniques using a sharp indenter, of which the sensitivity to residual stress effects is said to be inferior to that of spherical ones. The introduction of an angular correction in the model of Wang et al. which relates variations in the maximum load to the presence of residual stresses is proposed. Similarly, the contribution to the hardness of grain size refinement and work hardening, developed as a consequence of the severe plastic deformation during blasting, is determined in order to avoid overestimation of the residual stresses. Measurements were performed on polished cross sections along a length of several microns, thus obtaining a profile of the residual stresses. Results show good agreement with those obtained by synchrotron radiation on the same specimens, which validates the method and demonstrates that microindentation using sharp indenters may be sensitive to the residual stress effect. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002168 [article] Novel approaches to determining residual stresses by ultramicroindentation techniques : Application to sandblasted austenitic stainless steel [texte imprimé] / E. Frutos, Auteur ; M. Multigner, Auteur ; J.L. González-Carrasco, Auteur . - 2011 . - pp. 4191–4198. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4191–4198 Mots-clés : Sand  blasting  Microindentation  Austenitic  steels  Residual  stresses  Microstructure Résumé : This research addresses the determination of residual stresses in sandblasted austenitic steel by ultramicroindentation techniques using a sharp indenter, of which the sensitivity to residual stress effects is said to be inferior to that of spherical ones. The introduction of an angular correction in the model of Wang et al. which relates variations in the maximum load to the presence of residual stresses is proposed. Similarly, the contribution to the hardness of grain size refinement and work hardening, developed as a consequence of the severe plastic deformation during blasting, is determined in order to avoid overestimation of the residual stresses. Measurements were performed on polished cross sections along a length of several microns, thus obtaining a profile of the residual stresses. Results show good agreement with those obtained by synchrotron radiation on the same specimens, which validates the method and demonstrates that microindentation using sharp indenters may be sensitive to the residual stress effect. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002168