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Additive manufacturing is becoming a technique with great prospects for theproduction of components with new designs or shapes that are difficult toobtain by conventional manufacturing methods. One of the most promisingtechniques for printing metallic components is binder jetting, due to its timeefficiency and its ability to generate complex parts. In this process, a liquidbinding agent is selectively deposited to adhere the powder particles of theprinting material. Once the metallic piece is generated, it undergoes asubsequent process of curing and sintering to increase its density (hotisostatic pressing). In this work, we propose subjecting the manufacturedcomponent to an additional post-processing treatment involving the applicationof a high hydrostatic pressure (5000 bar) at room temperature. Thispost-processing technique, so-called cold isostatic pressing (CIP), is shown toincrease the yield load and the maximum carrying capacity of an additivelymanufactured AISI 316L stainless steel. The mechanical properties, with andwithout CIP processing, are estimated by means of the small punch test, asuitable experimental technique to assess the mechanical response of smallsamples. In addition, we investigate the porosity and microstructure of thematerial according to the orientations of layer deposition during themanufacturing process. Our observations reveal a homogeneous distributionindependent of these orientations, evidencing thus an isotropic behaviour ofthe material.

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