 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 12804 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8044
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| In English (Mech. Solids): | | 4760 |
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| << Previous article | Volume 57, Issue 3 / 2022 | Next article >> |
| Josef Tomas, Markus Merkel, and Holm Altenbach, "On the Optical Thermography in Selective Laser Melting Process," Mech. Solids. 57 (3), 597-603 (2022) |
| Year |
2022 |
Volume |
57 |
Number |
3 |
Pages |
597-603 |
| DOI |
10.3103/S0025654422030207 |
| Title |
On the Optical Thermography in Selective Laser Melting Process |
| Author(s) |
Josef Tomas (Aalen University of Applied Sciences, Beethovenstr. 1, 73430, Aalen, Germany, josef.tomas@hs-aalen.de)
Markus Merkel (Aalen University of Applied Sciences, Beethovenstr. 1, 73430, Aalen, Germany, markus.merkel@hs-aalen.de)
Holm Altenbach (Otto-von-Guericke University Magdeburg, Universitaetsplatz 2, 39106, Magdeburg, Germany, holm.altenbach@ovgu.de) |
| Abstract |
In recent years, additive manufacturing has attracted great attention worldwide. This new production process makes it possible to manufacture highly complex components without the need for special tools. In addition, the plastic and metal printed components are successfully used in industries such as mechanical engineering, plant construction, automotive engineering, and aerospace. For this reason, many materials were tested for their properties such as hardness, surface quality, and material behavior. In the aerospace industry, for example, the main objective is to increase the strength to weight ratio to make aircraft lighter, which is why most of the materials used in this area are plastics, aluminum, and titanium alloys.
Selective laser beam melting is one of the additive manufacturing methods where the metal powder is completely melted. The components are created layer by layer during the process by completely melting the powder and partially melting the underlying layer. The layer-wise generation and the melting of the powder in the process lead to high temperature gradients and to anisotropic material behavior. In addition to the composition of the molten pool, the heat balance, characterized by local temperatures, dwell times and local cooling gradients are the determining properties for the later material phases. These thermal influences are challenges in the metallic 3D-printing process. There are several methods to record these thermal effects.
In this work, an off-axis optical thermographic camera monitors the selective laser beam melting process. During the 3D printing process, the camera records the temperature of each layer after coating. These fields are used to monitor the process and for early detection of errors like delamination of layers or overheating of components. In addition, the temperature curves over the height are generated to determine the phase transformation of the layers. These experiments were carried out with different materials. They have been characterized by microscopy, computed tomography, electron backscatter diffraction, and others. |
| Keywords |
additive manufacturing, emissivity, quality assurance, thermographic imaging |
| Received |
22 December 2018 | Revised |
24 January 2019 | Accepted |
25 January 2019 |
| Link to Fulltext |
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