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Influence of laser metal deposition process parameters on a precipitation hardening stainless steel
University West, Department of Engineering Science, Division of Welding Technology. (KAMPT)ORCID iD: 0000-0001-9855-6100
University West, Department of Engineering Science, Division of Welding Technology. (KAMPT)ORCID iD: 0000-0003-3374-6282
University West, Department of Engineering Science, Division of Welding Technology. (KAMPT)
Uddeholms AB, Hagfors (SWE).
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2023 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 67, no 4, p. 1067-1080Article in journal (Refereed) Published
Abstract [en]

The combination of corrosion resistance and mechanical properties of martensitic precipitation hardening stainless steels (MPHSS) makes them well suited for demanding applications in aerospace, high-pressure gas bottles, or in injection molding of corrosive plastics. Directed energy deposition methods and specifically the laser metal deposition process with powder as feedstock (LMDp) have the potential to be applied in the production of such components. It is well-known that the geometrical features of the deposited beads such as aspect ratio and dilution are crucial for process efficiency and deposition quality. Therefore, this work aims at understanding the influence of the process parameters and the resulting microstructure of a MPHSS modified PH 13-8Mo alloy when using LMDp. Design of experiment (DoE) was used to plan and analyze the influence and interaction of the different LMDp process variables in the geometry of the deposits. It was found that height, width, and depth were statistically significantly influenced by speed, while height was also considerably influenced by the powder feeding rate. In terms of laser power, it was the most significant factor for the width and the depth, but it did not significantly affect the height of the beads. The results showed that the as-deposited microstructure of the modified PH 13-8Mo under the LMDp conditions investigated in this work consists of a martensitic matrix with some amount of primary δ ferrite. The presence of a low amount of retained austenite and aluminum-enriched inclusions was confirmed. This work enhances the fundamental process and material understanding of LMDp of the modified PH 13-8Mo alloy as a first stage in the fabrication of additively manufactured components.

Place, publisher, year, edition, pages
Springer, 2023. Vol. 67, no 4, p. 1067-1080
Keywords [en]
Martensitic precipitation hardening stainless steels, Laser metal deposition, Modifed PH 13-8Mo
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20968DOI: 10.1007/s40194-023-01478-7ISI: 000918404500001Scopus ID: 2-s2.0-85147271322OAI: oai:DiVA.org:hv-20968DiVA, id: diva2:1813628
Note

CC BY 4.0

The Knowledge Foundation funded this research via the TAPERTECH: TAiloring of high-PERformance parts through laser and arc additive manufacturing TECHhnologies project (Reference number: 2018/1890 B20).

Available from: 2023-11-21 Created: 2023-11-21 Last updated: 2024-01-08Bibliographically approved

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Aydin, GökçeHögström, MatsAndersson, Joel

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