PSI - Issue 77

Roman Hofmann et al. / Procedia Structural Integrity 77 (2026) 237–247 Roman Hofmann et al. / Structural Integrity Procedia 00 (2026) 000–000

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Limitations and Outlook This study is subject to several limitations. First, no strategy-specific parameter optimization was performed; base line process settings were only minimally adapted for comparability. The thermographic analysis was limited to qual itative snapshots, and more extensive recordings together with automated evaluation routines are currently under development. The number of fatigue specimens was small, and surface roughness in the gauge section was not quan tified, although this factor is known to strongly a ff ect fatigue performance. Furthermore, metallographic analysis of the cantilever specimens has not yet been carried out; such data would provide valuable correlations between thermal history, residual stress, and microstructural features. The Voronoi strategy in particular o ff ers considerable freedom in terms of cell seeding, hatch orientation within individual fields, and zone-specific parameterization. While it was originally developed to locally assign di ff erent parameter sets and thereby influence microstructure and properties, this potential has not yet been systematically explored. Deeper investigations, for example by employing (Electron Backscatter Di ff raction) EBSD to resolve grain morphology and texture, will be essential to fully exploit this approach. Future work will therefore (i) perform strategy-specific parameter optimization, (ii) quantify thermography with temperature and gradient metrics, (iii) carry out detailed microstructure analysis (EBSD) to establish mechanistic links, (iv) systematically study surface-roughness e ff ects on fatigue, (v) refine Voronoi implementations (seeding, contouring, multi-parameter zoning) to enable local tailoring of properties, and (vi) extend the evaluation to multi laser systems and additional alloys.

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Acknowledgements

The work was partially funded by the German Federal Ministry of Education and Research (BMBF) under grant number 03LB208A. The project was managed by the Project Management Ju¨lich (PtJ).

Furthermore the used machhine for this study Evobeam SLaVAM 300 machine (DFG object number: 657480) was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – INST 41 / 1098-1 FUGG.