Comportamiento en fatiga de una aleación de Ti-6Al-4V fabricada mediante Binder Jetting

  1. J.M. Alegre 1
  2. A. Díaz 1
  3. R. García 2
  4. L.B. Peral 1
  5. M. Lorenzo 1
  6. I.I. Cuesta 1
  1. 1 University of Burgos. Escuela Politécnica Superior
  2. 2 HIP Innovation Center, Hiperbaric S.L., C. Condado de Treviño
Journal:
Revista española de mecánica de la fractura

ISSN: 2792-4246

Year of publication: 2023

Issue: 5

Pages: 275-280

Type: Article

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Abstract

Binder Jetting (BJ) is an additive manufacturing technique based on the generation of a part by selective bonding of powder by means of an adhesive, and subsequent high temperature sintering process to densify the material and obtain parts with acceptable properties. Due to the high initial porosity of the material after sintering, hot isostatic pressing (HIP) post-treatments can be applied to increase the density of the material and improve the mechanical and fatigue properties of the resulting component. This work analyses the fatigue behaviour of a Ti-6Al-4V alloy, fabricated by BJ and subjected to two different HIP processes, one at 920ºC/100MPa for 4h, and a second one at high pressure but lower temperature (HIP-HPLT) at 850ºC/200MPa for 2h. The effect of HIP on the densification, microstructure, mechanical behaviour, and fatigue properties is studied. Fatigue and fracture micromechanisms indicate that the oxygen content generated by the decomposition of the binder during the sintering processes plays a critical role in the resulting mechanical properties, reducing the ductility and fatigue life, and moving away from the behaviour obtained by other additive manufacturing techniques such as SLM.

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