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© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Binder jetting 3D printing is an additive manufacturing technique based on the creation of a part through the selective bonding of powder with an adhesive, followed by a sintering process at high temperature to densify the material and produce parts with acceptable properties. Due to the high initial porosity in the material after sintering, which is typically around 5%, post-sintering treatments are often required to increase the material density and enhance the mechanical and fatigue properties of the final component. This paper focuses on the study of the benefits of hot isostatic pressing (HIP) after sintering on the mechanical and fatigue properties of a binder jetting Ti-6Al-4V alloy. Two different HIP processes were considered in this study: one at 920 °C/100 MPa for 4 h, and a second at a higher pressure but lower temperature (HIP-HPLT) at 850 °C/200 MPa for 2 h. The effects of the HIP on the densification, microstructure, mechanical behavior, and fatigue properties were investigated. The results show that the HIP-HPLT process produced a significant increase in the mechanical and fatigue properties of the material compared with the as-sintered parts and even with the conventional HIP process. However, the fatigue and fracture micromechanisms suggest that the oxygen content, which resulted from the decomposition of the binder during the sintering process, played a critical role in the final mechanical properties. Oxygen could reduce the ductility and fatigue life, which deviated from the behavior observed in other additive manufacturing techniques, such as powder bed fusion (PBF).

Details

Title
Mechanical and Fatigue Properties of Ti-6Al-4V Alloy Fabricated Using Binder Jetting Process and Subjected to Hot Isostatic Pressing
Author
Alegre, Jesús Manuel 1   VIAFID ORCID Logo  ; Díaz, Andrés 1   VIAFID ORCID Logo  ; García, Ruben 2 ; Luis Borja Peral 3 ; Lorenzo-Bañuelos, Miriam 1   VIAFID ORCID Logo  ; Isidoro Iván Cuesta 1   VIAFID ORCID Logo 

 Escuela Politécnica Superior, University of Burgos, Av de Cantabria s/n, 09006 Burgos, Spain; [email protected] (A.D.); [email protected] (M.L.-B.); 
 HIP Innovation Center, Hiperbaric S.L., C. Condado de Treviño, 6, 09001 Burgos, Spain; [email protected] 
 Materials Science and Metallurgical Engineering Department, Edificio Departamental Este, Campus de Gijón, University of Oviedo, St. Wilfredo Ricart, s/n, 33007 Gijón, Spain; [email protected] 
First page
3825
Publication year
2024
Publication date
2024
Publisher
MDPI AG
e-ISSN
19961944
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3090953772
Copyright
© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.