Authors: Tillmann, Wolfgang
Wojarski, Lukas
Henning, Tim
Title: Investigation of joints from laser powder fusion processed and conventional material grades of 18MAR300 nickel maraging steel
Language (ISO): en
Abstract: Even though the buildup rate of laser powder bed fusion processes (LPBF) has steadily increased in recent years by using more and more powerful laser systems, the production of large-volume parts is still extremely cost-intensive. Joining of an additively manufactured complex part to a high-volume part made of conventional material is a promising technology to enhance economics. Today, constructors have to select the most economical joining process with respect to the individual field of application. The aim of this research was to investigate the hybrid joint properties of LBPF and conventionally casted 18MAR300 nickel maraging steel depending on the manufacturing process and the heat treatment condition. Therefore, the microstructure and the strength of the hybrid joints manufactured by LPBF or vacuum brazing were examined and compared to solid material and joints of similar material. It was found that the vacuum-brazed hybrid joints using a 50.8-μm-thick AuNi18 foil provide a high tensile strength of 904 MPa which is sufficient for a broad field of application. Furthermore, the additively manufactured hybrid samples offered with 1998 MPa a tensile strength more than twice as high but showed a considerable impact of buildup failures to the strength in general.
Subject Headings: Economical manufacturing
Nickel maraging steel
Laser powder bed fusion (LPBF)
Vacuum brazing
Joint strength
Subject Headings (RSWK): Kostengünstiges Verfahren
Martensitaushärtender Stahl
Selektives Laserschmelzen
Issue Date: 2021-03-01
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Appears in Collections:Lehrstuhl für Werkstofftechnologie

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