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Detailed evaluation of topographical effects of Hirtisation post-processing on electron beam powder bed fusion (PBF-EB) manufactured Ti-6Al-4V component
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes. Chalmers University of Technology, Sweden.ORCID iD: 0000-0003-3656-1806
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0000-0003-2991-2911
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
2024 (English)In: Precision engineering, ISSN 0141-6359, E-ISSN 1873-2372, Vol. 85, p. 319-327Article in journal (Refereed) Published
Abstract [en]

Metal additive manufacturing surface topographies are complex and challenging to characterise due to e.g. steep local slopes, re-entrant features, varying reflectivity and features of interest in vastly different scale ranges. Nevertheless, average height parameters such as Ra or Sa are commonly used as sole parameters for characterisation. In this paper, a novel method for selecting relevant parameters for evaluation is proposed and demonstrated using a case study where the smoothing effects after three processing steps of the electro chemical post-process Hirtisation of a metal AM surface are quantified. The method uses a combination of conventional areal texture parameters, multiscale analysis and statistics and can be used to efficiently achieve a detailed and more relevant surface topography characterisation. It was found that the three process steps have different effects on the surface topography regarding the types and sizes of features that were affected. In total, Sdq was reduced by 97 %, S5v was reduced by 81 % and Sa was reduced by 78 %. A surface texture with much lower average roughness, less deep pits and less steep slopes was produced, which is expected to be beneficial for improved fatigue properties.

Place, publisher, year, edition, pages
Elsevier Inc. , 2024. Vol. 85, p. 319-327
Keywords [en]
Aluminum alloys; Textures; Titanium alloys; Topography; Average height; Electron-beam; Hirtisation; Metal additives; Multi scale analysis; PBF-EB/M/ti6al4v; Post-processing; Powder bed; Surface topography characterization; Topographical effects; Surface topography
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-67955DOI: 10.1016/j.precisioneng.2023.10.007Scopus ID: 2-s2.0-85175704403OAI: oai:DiVA.org:ri-67955DiVA, id: diva2:1814648
Note

J.B. is grateful for the support from Vinnova, the Swedish Innovation Agency, by means of grant 2022-03111 . This research did not receive any other specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Available from: 2023-11-27 Created: 2023-11-27 Last updated: 2023-11-27Bibliographically approved

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