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Open AccessArticle

Cold Isostatic Pressing to Improve the Mechanical Performance of Additively Manufactured Metallic Components

1
Structural Integrity Group, Universidad de Burgos, Avenida Cantabria s/n, 09006 Burgos, Spain
2
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
*
Author to whom correspondence should be addressed.
Materials 2019, 12(15), 2495; https://doi.org/10.3390/ma12152495
Received: 5 July 2019 / Revised: 1 August 2019 / Accepted: 5 August 2019 / Published: 6 August 2019
(This article belongs to the Section Manufacturing Processes and Systems)
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PDF [3179 KB, uploaded 6 August 2019]
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Abstract

Additive manufacturing is becoming a technique with great prospects for the production of components with new designs or shapes that are difficult to obtain by conventional manufacturing methods. One of the most promising techniques for printing metallic components is binder jetting, due to its time efficiency and its ability to generate complex parts. In this process, a liquid binding agent is selectively deposited to adhere the powder particles of the printing material. Once the metallic piece is generated, it undergoes a subsequent process of curing and sintering to increase its density (hot isostatic pressing). In this work, we propose subjecting the manufactured component to an additional post-processing treatment involving the application of a high hydrostatic pressure (5000 bar) at room temperature. This post-processing technique, so-called cold isostatic pressing (CIP), is shown to increase the yield load and the maximum carrying capacity of an additively manufactured AISI 316L stainless steel. The mechanical properties, with and without CIP processing, are estimated by means of the small punch test, a suitable experimental technique to assess the mechanical response of small samples. In addition, we investigate the porosity and microstructure of the material according to the orientations of layer deposition during the manufacturing process. Our observations reveal a homogeneous distribution independent of these orientations, evidencing thus an isotropic behaviour of the material. View Full-Text
Keywords: cold isostatic pressure; metal 3D printing; small punch test; binder jetting cold isostatic pressure; metal 3D printing; small punch test; binder jetting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Cuesta, I.I.; Martínez-Pañeda, E.; Díaz, A.; Alegre, J.M. Cold Isostatic Pressing to Improve the Mechanical Performance of Additively Manufactured Metallic Components. Materials 2019, 12, 2495.

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