Manufacturing Technology 2025, 25(2):153-160 | DOI: 10.21062/mft.2025.025

Possibilities of Evaluating the Quality of Products Produced by Directed Energy Deposition Technology

Petr Beneš ORCID...^1,2, David Bricín ORCID...², Denisa Janová ORCID...¹

¹ Faculty of Mechanical Engineering, University of West Bohemia, Univerzitni 2732/8, 301 00, Plzeň. Czech Republic

² Centrum výzkumu Řež s.r.o., Morseova 1267/10, 301 00, Plzeň, Czech Republic

It is well known that the porosity of a product can have a negative effect on the mechanical properties of the product. For this reason, its control is very important. Porosity can be assessed by two methods - destructive and nondestructive inspection. However, the identification of very small pores is still very difficult for metallic materials, as the pore size may be below the resolution of most commonly used NDT techniques. In addition, different types of pores may be present in a single part, with one type usually dominating. Proper identification of porosity is essential to estimate the impact on structural properties. For pore assessment, as for other defects, the description of the morphology, distribution and frequency is important. This article deals with the comparison of methods designed to determine the porosity of products that have been manufactured using Laser Directed Energy Deposition – L-DED additive process. The samples were made from AISI 316L stainless steel. The porosity of these samples was assessed using destructive and nondestructive methods. Subsequently, their comparison was made in relation to the detection of different pore sizes. The samples were subsequently subjected to the HIP process (Hot Isostatic Pressing). For these samples, the changes that occurred in the material as a result of this process were subsequently quantified. This process should have a positive effect on improving the quality of the product produced by AM technologies, e.g. by reducing the number and size of pores.

Keywords: AM technology, NDT, DED technology, Material imperfections, HIP process

Grants and funding:

The presented results were obtained thanks to the collaboration with Comtes FHT a.s. The presented work has been realized within Institutional Support by the Ministry of Industry and Trade of the Czech Republic. The presented results were obtained using the CICRR infrastructure, which is financially supported by the Ministry of Education, Youth and Sports - project LM2023041

Received: November 25, 2024; Revised: April 17, 2025; Accepted: April 17, 2025; Prepublished online: May 5, 2025; Published: May 6, 2025  Show citation