title: The effect of post-sintering treatments on the fatigue and biological behavior of Ti-6Al-4V ELI parts made by selective laser melting.
abstract: Fatigue resistance and biocompatibility are key parameters for the successful implantation of hard-tissue prostheses, which nowadays are more and more frequently manufactured by selective laser melting (SLM). For this purpose, the present paper is aimed at investigating the effect of post-sintering treatments on the fatigue behavior and biological properties of Ti samples produced by SLM. After the building process, all samples are heat treated to achieve a complete stress relief. The remaining ones are tribofinished with the aim of reducing the surface roughness of the as-sintered condition. Part of the tribofinished samples are then subjected to one of the following post-sintering treatments: (i) shot peening, (ii) hot isostatic pressing (HIP), and (iii) electropolishing. It is found that shot peening and HIP are the most effective treatments to improve the high and the very-high cycle fatigue resistance, respectively. At the same time, they preserve the good biocompatibility ensured by the biomedical Titanium Grade 23.
authors.affiliation: Department of Industrial Engineering, University of Trento, Trento, Italy. Electronic address: matteo.benedetti@unitn.it.
authors.forename: M
authors.initials: M
authors.lastname: Benedetti
authors.affiliation: Department of Industrial Engineering, University of Trento, Trento, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Torresani
authors.affiliation: Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Leoni
authors.affiliation: Department of Industrial Engineering, University of Trento, Trento, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Fontanari
authors.affiliation: Peen Service Ltd, Bologna, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Bandini
authors.affiliation: Laboratory of Biomolecular Sequence and Structure Analysis for Health, Fondazione Bruno Kessler, Trento, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Pederzolli
authors.affiliation: Laboratory of Biomolecular Sequence and Structure Analysis for Health, Fondazione Bruno Kessler, Trento, Italy; Institute of Biophysics, CNR, Trento, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Potrich
mesh_terms: D000497:Alloys; D006244:Hardness; D006801:Humans; D007834:Lasers; D008422:Materials Testing; D019736:Prostheses and Implants; D013499:Surface Properties; D014025:Titanium / Q000032:analysis*
chemical_list: D000497:Alloys; C031462:titanium alloy (TiAl6V4); D014025:Titanium
keywords: Biocompability; Fatigue; Hot isostatic pressing; Selective laser melting; Shot peening; Ti-6Al-4V ELI