Publication · 2024
RISØ 2024 – L-PBF Ti-6Al-4V & indentation
On-line monitoring and indentation mapping for additively manufactured titanium parts.
Publications & projects
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Journal · July 2022
Pulse current GMAW – S460M
Weld process stability, heat input and local yield behaviour in structural steel joints.
Conference · July 2019
Fine-grained bainitic steels
Improved strength and toughness concepts for fine-grained bainitic material systems.
Technical rule · Nov. 2019
DIN SPEC 4864
Standardised workflow for deriving stress-strain-related data from imprints.
Publications · research projects
Which detailed abstracts and references are available?
Selection of current and past work. Further information on request.
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"On-line monitoring and indentation mapping for L-PBF Ti-6Al-4V."
#RISØ2024 | 2024-08 | Risø International Symposium on Materials Science · P. Zok, M. Busek, P. Reinstädt
Abstract: "Laser powder bed fusion (L-PBF) of Ti-6Al-4V enables high-performance components but requires tightly controlled build conditions. We combine optical monitoring and high-resolution indentation mapping to correlate melt pool stability with micro-mechanical properties. The study shows how in-situ data supports the identification of parameter windows with narrow hardness distributions and balanced residual stresses."
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"Pulse current gas metal arc welding for steel S460M."
#MMI2022 | 2022-07 | Materialwissenschaft und Werkstofftechnik (MMI) · P. Zok, M. Spanier, D. Schubert
Abstract: "Arc stability with pulse current GMAW is investigated for thermomechanically rolled structural steel S460M. Special focus is placed on heat input, filler selection and the resulting mechanical properties of the welded joints. Mechanical testing (instrumented indentation, tensile, Charpy) reveals parameter combinations with higher throughput and more reproducible quality compared to conventional spray arc modes."
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"Fine-grained low carbon bainitic steels with improved properties."
#HRPZBS | 2019-07 | Conference paper on ResearchGate · H. Roelofs, P. Zok, B. Schmaling
Abstract: "Reducing the weight of car components has led to filigree parts and the use of stronger materials. Conventional quenched and tempered steels do not always fulfil the demands regarding reliability, economics and sustainability. Thermomechanically processed bainitic steels provide better combinations of these criteria. Applying the industrial XTP technology enabled fine-grained low carbon bainitic-martensitic bars with significantly lower Charpy transition temperatures compared to conventional hot-rolled bars. Tempering effects and resulting property profiles are discussed in detail."
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"DIN SPEC 4864"
#DS4864 | 2019-11 | Technical rule at Beuth Verlag · A. Braun, T. Chudoba, M. Griepentrog, M. Schäfer, B. Hachmann, B. Schmaling, P. Zok, P. Beisel, P. Reinstädt, F. Menelao
Intro: "This DIN SPEC was created via the PAS procedure by a temporary consortium. It defines a test method to determine flow curves of metallic materials using low-destructive indentation, 3D measurement and FE material modelling. The flow curves provide comparable characteristics to tensile tests per DIN EN ISO 6892-1. The method applies to plastically deformable materials that form a rim pile-up, whose grain size is max. one third of the indentation diameter and that show no lamellar/graphite phases causing tension/compression asymmetry. Material-specific calibration can be added. The method delivers quantitative, direction-independent results and can also be used qualitatively for anisotropic flow curves at low penetration depths."