@article{60040, author = {{Pfeffer, Nina and Jäger, Stefanie Nicole and Kaiser, Maximilian Alexander and Meyer, Thomas and Stark, Andreas and Höppel, Heinz Werner}}, issn = {{0921-5093}}, journal = {{Materials Science and Engineering: A}}, publisher = {{Elsevier BV}}, title = {{{Enhancing mechanical strength of Ti-6Al-4V sheet material by short-time sub-β-transus solution heat treatment and additional short-time annealing}}}, doi = {{10.1016/j.msea.2025.147787}}, volume = {{926}}, year = {{2025}}, } @article{61139, author = {{Pfeffer, Nina and Kaiser, Maximilian Alexander and Feix, Werner and Kälble, Nils and Merten, Mathias and Stark, Andreas and Haufe, Andre and Meyer, Thomas and Tröster, Thomas and Höppel, Heinz Werner}}, issn = {{0921-5093}}, journal = {{Materials Science and Engineering: A}}, publisher = {{Elsevier BV}}, title = {{{Energy- and material-efficient Ti-6Al-4V sheet part fabrication by the novel TISTRAQ-process, including resistance heating and tool-based quenching: Insights into test stand design and material potential}}}, doi = {{10.1016/j.msea.2025.149015}}, volume = {{945}}, year = {{2025}}, } @inproceedings{49430, abstract = {{Within the current energy and environmental crisis, new material- and energy-saving processes are needed. For this reason, this study focuses on the development of a new forming technology for Ti-6Al-4V sheet metal. It is based on combination of solution treatment by resistive heating with rapid tool-based quenching and subsequent annealing. This new “TISTRAQ” process is comparable with press-hardening already known for steels and hot die quenching known for aluminium alloys. One of the main influencing factors for this process is the heat transfer coefficient (HTC). It is an important driver for adjustment of basic parameters, as selection of tool material or the forming speed but also plays an important role while elaborating temperature distribution in the numerical model. Therefore, a new and unique test rig was developed to determine the HTC and to perform tool-based heat treatment at specimen level under laboratory conditions. The test rig was used to investigate the influence of the titanium-tool-lubricant system on HTC and cooling rate. Further the effect of heat treatment in the test rig and tool-based quenching on microstructure and mechanical properties was studied. To improve the prediction of the temperature distribution of the titanium during cooling, the HTC was integrated into the numerical process simulation}}, author = {{Kaiser, Maximilian Alexander and Höschen, Fabian and Pfeffer, Nina and Merten, Mathias and Meyer, Thomas and Marten, Thorsten and Rockicki, Pawel and Höppel, Heinz Werner and Tröster, Thomas}}, booktitle = {{IOM3. Chapter 14: Forming, Machining & Joining [version 1; not peer reviewed]}}, keywords = {{Interfacial heat transfer coefficient, Ti-6Al-4V, nonisothermal forming, thermomechanical processing, TISTRAQ process}}, location = {{Edinburgh}}, title = {{{The new TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - investigation on heat transfer coefficient and influence on cooling rates}}}, doi = {{doi.org/10.7490/f1000research.1119929.1}}, year = {{2024}}, } @inproceedings{49437, abstract = {{The phase and TTT diagrams of the Ti-6Al-4V system allow the development of a new forming process for a more energy- and materialefficient production of sheet metal parts. This new “TISTRAQ” process is composed of two steps. In terms of process technology, the first step is comparable to a direct press-hardening process already well known for steels. In this step, the Ti-6Al-4V sheet material is resistively heated to a temperature below β-transus Tβ and, after a very short holding time, simultaneously formed and quenched by use of water cooled tools. Thereby, the β phase undergoes a martensitic transformation. The second step is a subsequent short-time annealing, which leads to a hardening of the material. In this work, a new test rig using resistive heating technique was used in order to produce different solution treated and tool quenched (STQ) and subsequently annealed (STA) states. In this paper, the effects of heating rate, solution treatment temperature and holding time on microstructure and mechanical properties are addressed. For the characterisation, tensile testing and scanning electron microscopy were used. By the systematic variation of applied processing parameters, dominating effects on microstructure and mechanical properties were evaluated. For example, the solution treatment temperature was found to have a significant effect on microstructural features and characteristic strength and strain values. The obtained results reveal a high potential for future technical applications.}}, author = {{Pfeffer, Nina and Kaiser, Maximilian Alexander and Meyer, Thomas and Göken, Mathias and Höppel, Heinz Werner}}, booktitle = {{IOM3. Chapter 14: Forming, Machining & Joining [version 1; not peer reviewed]}}, keywords = {{Ti-6Al-4V, thermomechanical processing, resistive heating, quench-forming, process parameter-microstructure-properties relationship}}, location = {{Edinburgh}}, title = {{{The new TISTRAQ process: Solution treatment with rapid quenching and annealing for Ti-6Al-4V sheet metal part forming - the effect of processing parameters on microstructure and mechanical properties}}}, doi = {{https://doi.org/10.7490/f1000research.1119929.1}}, year = {{2024}}, } @article{56089, abstract = {{Additive manufacturing (AM) technologies enable near-net-shape designs and demand-oriented material usage, which significantly minimizes waste. This points to a substantial opportunity for further optimization in material savings and process design. The current study delves into the advancement of sustainable manufacturing practices in the automotive industry, emphasizing the crucial role of lightweight construction concepts and AM technologies in enhancing resource efficiency and reducing greenhouse gas emissions. By exploring the integration of novel AM techniques such as selective laser melting (SLM) and laser metal deposition (LMD), the study aims to overcome existing limitations like slow build-up rates and limited component resolution. The study’s core objective revolves around the development and validation of a continuous process chain that synergizes different AM routes. In the current study, the continuous process chain for DMG MORI Lasertec 65 3D’s LMD system and the DMG MORI Lasertec 30 3D’s was demonstrated using 316L and 1.2709 steel materials. This integrated approach is designed to significantly curtail process times and minimize component costs, thus suggesting an industry-oriented process chain for future manufacturing paradigms. Additionally, the research investigates the production and material behavior of components under varying manufacturing processes, material combinations, and boundary layer materials. The culmination of this study is the validation of the proposed process route through a technology demonstrator, assessing its scalability and setting a benchmark for resource-efficient manufacturing in the automotive sector.}}, author = {{Chalicheemalapalli Jayasankar, Deviprasad and Gnaase, Stefan and Kaiser, Maximilian Alexander and Lehnert, Dennis and Tröster, Thomas}}, issn = {{2075-4701}}, journal = {{Metals}}, keywords = {{additive manufacturing (AM), selective laser melting (SLM), laser metal deposition (LMD), hybrid manufacturing, process optimization, 316L, 1.2709}}, number = {{7}}, publisher = {{MDPI AG}}, title = {{{Advancements in Hybrid Additive Manufacturing: Integrating SLM and LMD for High-Performance Applications}}}, doi = {{10.3390/met14070772}}, volume = {{14}}, year = {{2024}}, } @inproceedings{49436, author = {{Kaiser, Maximilian Alexander and Reitz, Alexander and Konrad, Stefan and Meyer, Thomas and Marten, Thorsten and Tröster, Thomas}}, booktitle = {{Workshop Warmblechumformung}}, editor = {{Merklein, Marion}}, isbn = {{978-3-00-077160-6}}, keywords = {{Presshärten, resistive Schnellerwärmung, Energieeffizienz}}, location = {{Fürth}}, pages = {{99--118}}, publisher = {{Lehrstuhl für Fertigungstechnologie}}, title = {{{Untersuchung energieeffizienter und serientauglicher Erwärmungsstrategien mittels resistiver Erwärmung für den Presshärteprozess}}}, volume = {{18}}, year = {{2023}}, } @inproceedings{49424, abstract = {{Der Beitrag liefert einen Überblick über die Möglichkeiten der gekoppelten multiphysikalischen numerischen Simulation mit dem Finite Elemente-Löser LS-DYNA. Am Beispiel der resistiven Schnellerwärmung einer Titanlegierung im Forschungsprojekt TISTRAQ erfolgt die Beschreibung der Vorgehensweise, der Eingangs- und Ergebnisgrößen sowie der weiteren Anwendung der Simulation im Forschungsprojekt. Im Fokus steht dabei die Ermittlung der lokalen Temperaturverläufe, deren Kenntnis eine Grundvoraussetzung für die Berechnung prozessabhängiger Materialkennwerte darstellt.}}, author = {{Merten, Mathias and Klöppel, Thomas and Haufe, André and Kaiser, Maximilian Alexander and Wesendahl, Jan-Niklas and Konrad, Stefan}}, booktitle = {{Workshop Warmblechumformung}}, editor = {{Merklein, Marion}}, location = {{Fürth}}, publisher = {{Lehrstuhl für Fertigungstechnologie}}, title = {{{Gekoppelte Simulation des resistiven Schnellerwärmens für Fertigungsprozesse mit integrierter Wärmebehandlung am Beispiel der Titanlegierung Ti-6Al-4V}}}, volume = {{17}}, year = {{2022}}, } @inproceedings{49433, author = {{Kaiser, Maximilian Alexander and Rockicki, Pawel and Höschen, Fabian and Wesendahl, Jan-Niklas and Konrad, Stefan and Meyer, Thomas and Marten, Thorsten and Tröster, Thomas}}, keywords = {{Ti-6Al-4V, heat transfer coefficient}}, location = {{Orlando}}, title = {{{ Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy}}}, year = {{2022}}, } @inproceedings{49435, author = {{Kaiser, Maximilian Alexander and Wesendahl, Jan-Niklas and Meyer, Thomas}}, location = {{Berlin}}, title = {{{Isothermal hot forming of Titanium sheet metal - From parameter identification to custom parts}}}, year = {{2022}}, }