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Static and Dynamic Mechanical Behaviour of Hybrid-PBF-LB/M-Built and Hot Isostatic Pressed Lattice Structures

  • We report on a comprehensive study of the mechanical properties of maraging steel body-centred cubic lattice structures fabricated by a hybrid additive manufacturing technology that combines laser powder bed fusion with in situ high-speed milling. As the mechanical properties of additive manufactured components are inferior to, e.g., cast components, surface modifications can improve the mechanical behaviour. Different hybrid additive manufacturing technologies have been designed using additive and subtractive processes, improving process quality. Following this, mechanical testing is performed with respect to static tensile properties and dynamic stress, hardness, and porosity, comparing specimens manufactured by laser powder bed fusion only to those manufactured by the hybrid approach. In addition, the influence of different heat-treatment techniques on the mechanical behaviour of the lattice structures is investigated, namely solution and aging treatment as well as hot isostatic pressing. Thus, the influence of the superior surface quality due to the hybrid approach is evaluated, leading to, e.g., an offset of about 14–16% for the static testing of HIP lattice structures. Furthermore, the dynamic load behaviour can be improved with a finished surface, heading to a shift of the different zones of fatigue behaviour in the testing of hybrid-built specimens.

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Metadaten
Author:David Sommer, Cemal Esen, Ralf HellmannORCiD
URL:https://www.mdpi.com/1996-1944/16/9/3556
DOI:https://doi.org/https://doi.org/10.3390/ma16093556
Parent Title (German):Mechanical Properties of Polymeric, Metallic, and Composite Materials
Document Type:Article
Language:German
Year of Completion:2023
Release Date:2024/03/11
Tag:Fatigue behaviour; Hot isostatic pressing; Hybrid additive manufacturing; Lattice structures
GND Keyword:Isostatisches Heißpressen; Selektives Laserschmelzen
Volume:16
Issue:9
First Page:1
Last Page:14
Urheberrecht:1
Institutes:Fakultät Ingenieurwissenschaften / Labore / Angewandte Lasertechnik und Photonik (alp)
research focus :Materials / Innovative Material Processing
Reviewed:ja
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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