title: On the fatigue behavior of medical Ti6Al4V roughened by grit blasting and abrasiveless waterjet peening.
abstract: Flat fatigue specimens of biomedical Ti6Al4V ELI alloy were surface-processed by high pressure waterjet peening (WJP) without abrasive particles using moderate to severe conditions that yield roughness values in the range of those obtained by commercial grit blasting (BL) with alumina particles. Fatigue behavior of WJP and BL specimens was characterized under cyclical uniaxial tension tests (R=0.1). The emphasis was put on a comparative analysis of the surface and subsurface induced effects and in their relevance on fatigue behavior. Within the experimental setup of this investigation it resulted that blasting with alumina particles was less harmful for fatigue resistance than abrasiveless WJP. BL specimens resulted in higher subsurface hardening and compressive residual stresses. Specimens treated with more severe WJP parameters presented much higher mass loss and lower compressive residual stresses. From the analysis performed in this work, it follows that, in addition to roughness, waviness emerges as another important topographic parameter to be taken into account to try to predict fatigue behavior. It is envisaged that optimization of WJP parameters with the aim of reducing waviness and mass loss should lead to an improvement of fatigue resistance.
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo no. 8, 28040 Madrid, Spain. Electronic address: marcela@cenim.csic.es.
authors.forename: M
authors.initials: M
authors.lastname: Lieblich
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo no. 8, 28040 Madrid, Spain. Electronic address: s.barriuso@cenim.csic.es.
authors.forename: S
authors.initials: S
authors.lastname: Barriuso
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo no. 8, 28040 Madrid, Spain. Electronic address: jiu@cenim.csic.es.
authors.forename: J
authors.initials: J
authors.lastname: Ibáñez
authors.affiliation: Centro Láser UPM, Campus Sur UPM, Ctra. de Valencia, km 7,3, 28031 Madrid, Spain. Electronic address: leonardo.ruizdelara@upm.es.
authors.forename: L
authors.initials: L
authors.lastname: Ruiz-de-Lara
authors.affiliation: Centro Láser UPM, Campus Sur UPM, Ctra. de Valencia, km 7,3, 28031 Madrid, Spain. Electronic address: marcos.diaz@upm.es.
authors.forename: M
authors.initials: M
authors.lastname: Díaz
authors.affiliation: Centro Láser UPM, Campus Sur UPM, Ctra. de Valencia, km 7,3, 28031 Madrid, Spain. Electronic address: jlocana@etsii.upm.es.
authors.forename: J L
authors.initials: JL
authors.lastname: Ocaña
authors.affiliation: Tecnalia Research and Innovation, Paseo Mikeletegi 7, 20009 Donostia-San Sebastián, Spain. Electronic address: amaia.alberdi@tecnalia.com.
authors.forename: A
authors.initials: A
authors.lastname: Alberdi
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo no. 8, 28040 Madrid, Spain; Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain. Electronic address: jlg@cenim.csic.es.
authors.forename: J L
authors.initials: JL
authors.lastname: González-Carrasco
mesh_terms: D000497:Alloys; D001672:Biocompatible Materials / Q000032:analysis*; D008422:Materials Testing; D011312:Pressure; D013499:Surface Properties; D014025:Titanium / Q000032:analysis*
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; C031462:titanium alloy (TiAl6V4); D014025:Titanium
keywords: Fatigue resistance; Grit blasting; Residual stresses; Surface topography; Ti6Al4V; Waterjet peening