TY - GEN A1 - Santhanakrishnan Balakrishnan, Venkateswaran A1 - Hart-Rawung, Thawin A1 - Buhl, Johannes A1 - Seidlitz, Holger A1 - Bambach, Markus T1 - Impact and damage behaviour of FRP-metal hybrid laminates made by the reinforcement of glass fibers on 22MnB5 metal surface T2 - Composites Science and Technology Y1 - 2020 U6 - https://doi.org/10.1016/j.compscitech.2019.107949 SN - 1879-1050 SN - 0266-3538 VL - Vol. 187 ER - TY - GEN A1 - Imran, Muhammad A1 - Szyndler, Joanna A1 - Afzal, Muhammad Junaid A1 - Bambach, Markus T1 - Dynamic recrystallization-dependent damage modeling during hot forming T2 - International Journal of Damage Mechanics Y1 - 2020 U6 - https://doi.org/10.1177/1056789519848477 SN - 1530-7921 VL - 29 IS - 2 SP - 335 EP - 363 ER - TY - GEN A1 - Bambach, Markus A1 - Imran, Muhammad T1 - Extended Gurson–Tvergaard–Needleman model for damage modeling and control in hot forming T2 - Cirp Annals - Manufacturing Technology Y1 - 2019 U6 - https://doi.org/10.1016/j.cirp.2019.04.063 SN - 0007-8506 VL - 68 IS - 1 SP - 249 EP - 252 ER - TY - GEN A1 - Stendal, Johan Andreas A1 - Bambach, Markus A1 - Eisentraut, Mark A1 - Sizova, Irina A1 - Weiß, Sabine T1 - Applying Machine Learning to the Phenomenological Flow Stress Modeling of TNM-B1 T2 - Metals N2 - Data-driven or machine learning approaches are increasingly being used in material science and research. Specifically, machine learning has been implemented in the fields of materials discovery, prediction of phase diagrams and material modelling. In this work, the application of machine learning to the traditional phenomenological flow stress modelling of the titanium aluminide (TiAl) alloy TNM-B1 (Ti-43.5Al-4Nb-1Mo-0.1B) is investigated. Three model types were developed, analyzed and compared; a physics-based phenomenological model (PM) originally developed for steel by Cingara and McQueen, a purely data-driven machine learning model (MLM), and a hybrid model (HM), which uses characteristic points predicted by a learning algorithm as input for the phenomenological model. The same amount of data was used to both fit the PM and train the MLM and HM. The models were analyzed and compared based on the accuracy of their predictions, development and computing time, and their ability to predict on interpolated and extrapolated inputs. The results revealed that for the same amount of experimental data, the MLM was more accurate than the PM. In addition, the MLM was better able to capture the characteristic peak stress in the TNM-B1 the flow curves, and could be developed and computed faster. Furthermore, the MLM was able to make realistic predictions for inputs outside the experimental data used for training. The HM showed comparable accuracy to the PM for the experimental conditions. However, the HM was able to produce a better fit for input conditions outside the training data. KW - machine learning KW - phenomenological modeling KW - titanium aluminide KW - hot isothermal forging Y1 - 2019 UR - https://www.mdpi.com/2075-4701/9/2/220 U6 - https://doi.org/10.3390/met9020220 SN - 2075-4701 VL - 9 IS - 2 ER - TY - GEN A1 - Maqbool, Fawad A1 - Hajavifard, Ramin A1 - Walther, Frank A1 - Bambach, Markus T1 - Engineering the residual stress state of the metastable austenitic stainless steel (MASS) disc springs by incremental sheet forming (ISF) T2 - Production Engineering Y1 - 2019 U6 - https://doi.org/10.1007/s11740-018-0864-6 SN - 0944-6524 SN - 1863-7353 VL - Vol. 13 IS - 2 SP - 139 EP - 148 ER - TY - GEN A1 - Besong, Lemopi Isidore A1 - Buhl, Johannes A1 - Bambach, Markus T1 - Investigations on hole-flanging by paddle forming and a comparison with single point incremental forming T2 - International Journal of Mechanical Sciences Y1 - 2019 U6 - https://doi.org/10.1016/j.ijmecsci.2019.105143 SN - 0020-7403 VL - vol. 164 ER - TY - GEN A1 - Eisentraut, Mark A1 - Bolz, Sebastian A1 - Sizova, Irina A1 - Bambach, Markus A1 - Weiß, Sabine T1 - Development of a heat treatment strategy for the γ-TiAl based alloy TNM-B1 to increase the hot workability T2 - SN Applied Sciences Y1 - 2019 U6 - https://doi.org/10.1007/s42452-019-1563-4 SN - 2523-3963 SN - 2523-3971 VL - 1 IS - 11 ER - TY - GEN A1 - Stendal, Johan Andreas A1 - Eisentraut, Mark A1 - Sizova, Irina A1 - Bolz, Sebastian A1 - Bambach, Markus A1 - Weiß, Sabine T1 - Effect of heat treatment on the workability of hot isostatically pressed TNM-B1 T2 - AIP Conference Proceedings Y1 - 2019 SN - 978-0-7354-1847-9 U6 - https://doi.org/10.1063/1.5112544 VL - 2113 IS - 1 ER - TY - GEN A1 - Imran, Muhammad A1 - Szyndler, Joanna A1 - Afzal, Muhammad Junaid A1 - Bambach, Markus T1 - Towards the damage evolution for hot forming processes using Gurson-Tvergaard Needleman model – Coupled to dynamic recrystallization T2 - AIP Conference Proceedings Y1 - 2019 SN - 978-0-7354-1847-9 U6 - https://doi.org/10.1063/1.5112741 VL - 2113 IS - 1 ER - TY - GEN A1 - Maqbool, Fawad A1 - Bambach, Markus T1 - Experimental and Numerical Investigation of the Influence of Process Parameters in Incremental Sheet Metal Forming on Residual Stresses T2 - Journal of Manufacturing and Materials Processing Y1 - 2019 U6 - https://doi.org/10.3390/jmmp3020031 SN - 2504-4494 VL - 3 IS - 2 ER - TY - GEN A1 - Emdadi, Aliakbar A1 - Sizova, Irina A1 - Bambach, Markus A1 - Hecht, Ulrike T1 - Hot deformation behavior of a spark plasma sintered Fe-25Al-1.5Ta alloy with strengthening Laves phase T2 - Intermetallics Y1 - 2019 U6 - https://doi.org/10.1016/J.intermet.2019.03.017 SN - 0966-9795 VL - Vol. 109 SP - 123 EP - 134 ER - TY - GEN A1 - Buhl, Johannes A1 - Israr, Rameez A1 - Bambach, Markus T1 - Modeling and convergence analysis of directed energy deposition simulations with hybrid implicit / explicit and implicit solutions T2 - Journal of Machine Engineering Y1 - 2019 U6 - https://doi.org/10.5604/01.3001.0013.4086 SN - 2391-8071 SN - 1895-7595 VL - Vol. 19 IS - 3 SP - 94 EP - 107 ER - TY - GEN A1 - Fügenschuh, Armin A1 - Buhl, Johannes A1 - Bambach, Markus ED - Fortz, Bernard ED - Labbé, Martine T1 - Trajectory Optimization for Wire-Arc Additive Manufacturing T2 - Operations Research Proceedings 2018 ; selected papers of the Annual International Conference of the German Operations Research Society (GOR), Brussels, Belgium, September 12-14, 2018 Y1 - 2019 SN - 978-3-030-18499-5 SN - 978-3-030-18500-8 U6 - https://doi.org/10.1007/978-3-030-18500-8 SP - 331 EP - 337 PB - Springer CY - Cham ER - TY - GEN A1 - Besong, Lemopi Isidore A1 - Buhl, Johannes A1 - Bambach, Markus T1 - Paddle shape optimization for hole-flanging by paddle forming through the use of a predefined strain path in finite element analysis T2 - Journal of Machine Engineering Y1 - 2019 U6 - https://doi.org/10.5604/01.3001.0013.2226 SN - 1895-7595 SN - 2391-8071 VL - Vol. 19 IS - 2 SP - 83 EP - 98 ER - TY - GEN A1 - Hajavifard, Ramin A1 - Maqbool, Fawad A1 - Schmiedt-Kalenborn, Anke A1 - Buhl, Johannes A1 - Bambach, Markus T1 - Integrated Forming and Surface Engineering of Disc Springs by Inducing Residual Stresses by Incremental Sheet Forming T2 - Materials Y1 - 2019 U6 - https://doi.org/10.3390/ma12101646 SN - 1996-1944 VL - 12 IS - 10 ER - TY - GEN A1 - Maqbool, Fawad A1 - Hajavifard, Ramin A1 - Walther, Frank A1 - Bambach, Markus T1 - Experimental investigation and finite element modelling of residual stress control in disc springs made of metastable austenitic stainless steel (MASS) using incremental sheet forming (ISF) T2 - Procedia Manufacturing Y1 - 2019 U6 - https://doi.org/10.1016/j.promfg.2019.02.099 SN - 2351-9789 VL - Vol. 29 SP - 12 EP - 20 ER - TY - GEN A1 - Bambach, Markus A1 - Herty, Michael T1 - Model Predictive Control of the Punch Speed for Damage Reduction in Isothermal Hot Forming T2 - Materials Science Forum Y1 - 2019 U6 - https://doi.org/10.4028/www.scientific.net/MSF.949.1 VL - 949 ER - TY - GEN A1 - Silze, Frank A1 - Schnick, Michael A1 - Sizova, Irina A1 - Bambach, Markus T1 - Laser Metal Deposition of Ti-6Al-4V with a Direct Diode Laser Set-up and Coaxial Material Feed T2 - Procedia Manufacturing Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.156 SN - 2351-9789 VL - 47 SP - 1154 EP - 1158 ER - TY - GEN A1 - Klöppel, Thomas A1 - Merten, Mathias A1 - Haufe, Andre A1 - Buhl, Johannes A1 - Bambach, Markus ED - Bambach, Markus T1 - On the Numerical Prediction of Process-Dependent Properties of Current High-Performance Materials with Material Model *MAT_254 in LS-DYNA T2 - Procedia Manufacturing : 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.341 SN - 2351-9789 VL - 47 SP - 1520 EP - 1525 ER - TY - GEN A1 - Nguyen, Lam A1 - Buhl, Johannes A1 - Bambach, Markus ED - Bambach, Markus T1 - Multi-bead Overlapping Models for Tool Path Generation in Wire-Arc Additive Manufacturing Processes T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.129 SN - 2351-9789 VL - 47 SP - 1123 EP - 1128 ER - TY - GEN A1 - Hama-Saleh, Rebar A1 - Weisheit, Andreas A1 - Schleifenbaum, Johannes Henrich A1 - Ünsal, Ismail A1 - Sviridov, Alexander A1 - Bambach, Markus ED - Bambach, Markus T1 - Formability Analysis of Micro-Alloyed Sheet Metals Reinforced by Additive Manufacturing T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.317 SN - 2351-9789 VL - 47 SP - 1023 EP - 1028 ER - TY - GEN A1 - Michl, Dennis A1 - Sydow, Benjamin A1 - Bambach, Markus ED - Bambach, Markus T1 - Ring Rolling of Pre-forms Made by Wire-arc Additive Manufacturing T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.275 SN - 2351-9789 VL - 47 SP - 342 EP - 348 ER - TY - GEN A1 - Meiners, Frank A1 - Ihne, Jörg A1 - Jürgens, Pascal A1 - Hemes, Susanne A1 - Mathes, Michael A1 - Sizova, Irina A1 - Bambach, Markus A1 - Hama-Saleh, Rebar A1 - Weisheit, Andreas ED - Bambach, Markus T1 - New Hybrid Manufacturing Routes Combining Forging and Additive Manufacturing to Efficiently Produce High Performance Components from Ti-6Al-4V T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.215 SN - 2351-9789 VL - 47 SP - 261 EP - 267 ER - TY - GEN A1 - Hart-Rawung, Thawin A1 - Buhl, Johannes A1 - Bambach, Markus ED - Bambach, Markus T1 - A Fast Approach for Optimization of Hot Stamping Based on Machine Learning of Phase Transformation Kinetics T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.218 SN - 2351-9789 VL - 47 SP - 707 EP - 712 ER - TY - GEN A1 - Mishurova, Tatjana A1 - Sydow, Benjamin A1 - Thiede, Tobias A1 - Sizova, Irina A1 - Ulbricht, Alexander A1 - Bambach, Markus A1 - Bruno, Giovanni T1 - Residual Stress and Microstructure of a Ti-6Al-4V Wire Arc Additive Manufacturing Hybrid Demonstrator T2 - Metals Y1 - 2020 U6 - https://doi.org/10.3390/met10060701 SN - 2075-4701 VL - 6 IS - 10 ER - TY - GEN A1 - Nguyen, Lam A1 - Buhl, Johannes A1 - Bambach, Markus T1 - Continuous Eulerian tool path strategies for wire-arc additive manufacturing of rib-web structures with machine-learning-based adaptive void filling T2 - Additive Manufacturing Y1 - 2020 U6 - https://doi.org/10.1016/j.addma.2020.101265 SN - 2214-8604 VL - Vol. 35 ER - TY - GEN A1 - Bambach, Markus A1 - Sizova, Irina A1 - Sydow, Benjamin A1 - Hemes, Susanne A1 - Meiners, Frank T1 - Hybrid manufacturing of components from Ti-6Al-4V by metal forming and wire-arc additive manufacturing T2 - Journal of Materials Processing Technology Y1 - 2020 U6 - https://doi.org/10.1016/j.jmatprotec.2020.116689 SN - 0924-0136 IS - Vol. 282 ER - TY - GEN A1 - Gagliardi, Francesco A1 - Ambrogio, Giuseppina A1 - Conte, Romina A1 - Bambach, Markus T1 - Extruded joining elements manufactured by friction stir forming: an investigation of the process parameters T2 - The International Journal of Advanced Manufacturing Technology Y1 - 2020 U6 - https://doi.org/10.1007/s00170-020-04992-w SN - 1433-3015 VL - 106 IS - 11-12 SP - 5559 EP - 5570 ER - TY - GEN A1 - Imran, Muhammad A1 - Afzal, Muhammad Junaid A1 - Buhl, Johannes A1 - Bambach, Markus A1 - Dunlap, Anthony A1 - Schwedt, Alexander A1 - Aretz, Anke A1 - Wang, Shuhan A1 - Lohmar, Johannes A1 - Hirt, Gerhard T1 - Evaluation of process-induced damage based on dynamic recrystallization during hot caliber rolling T2 - Production Engineering Y1 - 2020 U6 - https://doi.org/10.1007/s11740-019-00932-0 SN - 1863-7353 SN - 0944-6524 VL - 14 IS - 1 SP - 5 EP - 16 ER - TY - GEN A1 - Alimov, Artem A1 - Sizova, Irina A1 - Biba, Nikolai A1 - Bambach, Markus ED - Bambach, Markus T1 - Prediction of Mechanical Properties of Ti-6Al-4V Forgings Based on Simulation of Microstructure Evolution T2 - Procedia Manufacturing : 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/J.promfg.2020.04.326 SN - 2351-9789 VL - 47 SP - 1468 EP - 1475 ER - TY - GEN A1 - Afzal, Muhammad Junaid A1 - Maqbool, Fawad A1 - Hajavifard, Ramin A1 - Buhl, Johannes A1 - Walther, Frank A1 - Bambach, Markus ED - Bambach, Markus T1 - Modeling the Residual Stresses Induced in the Metastable Austenitic Stainless Steel Disc Springs manufactured by Incremental Sheet Forming by a Combined Hardening Model with Phase Transformation T2 - Procedia Manufacturing : Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.300 SN - 2351-9789 VL - 47 SP - 1410 EP - 1415 ER - TY - GEN A1 - Besong, Lemopi Isidore A1 - Buhl, Johannes A1 - Ünsal, Ismail A1 - Bambach, Markus A1 - Polte, Mitchel A1 - Blumberg, Julian A1 - Uhlmann, Eckart ED - Bambach, Markus T1 - Development of Tool Paths for Multi-axis Single Stage Incremental Hole-flanging T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.290 SN - 2351-9789 VL - 47 SP - 1392 EP - 1398 ER - TY - GEN A1 - Neumann, Andreas A1 - Brykarczyk, Daniel A1 - Lenz, Wolfgang A1 - Bambach, Markus A1 - Pfeifer, Herbert ED - Bambach, Markus T1 - Using Vault Structure Steels to Improve the Lifetime of Radiant Tubes T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.240 SN - 2351-9789 VL - 47 SP - 1288 EP - 1292 ER - TY - GEN A1 - Emdadi, Aliakbar A1 - Sizova, Irina A1 - Stryzhyboroda, Oleg A1 - Hecht, Ulrike A1 - Buhl, Johannes A1 - Bambach, Markus ED - Bambach, Markus T1 - Hot Workability of a Spark Plasma Sintered Intermetallic Iron Aluminide Alloy Above and Below the Order-disorder Transition Temperature T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.238 SN - 2351-9789 VL - 47 SP - 1281 EP - 1287 ER - TY - GEN A1 - Israr, Rameez A1 - Buhl, Johannes A1 - Bambach, Markus ED - Bambach, Markus T1 - Numerical Analysis of Different Fixation Strategies in Direct Energy Deposition Processes T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming; edited by Markus Bambach Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.145 SN - 2351-9789 VL - 47 SP - 1184 EP - 1189 ER - TY - GEN A1 - Bambach, Markus A1 - Fügenschuh, Armin A1 - Buhl, Johannes A1 - Jensch, Felix A1 - Schmidt, Johannes ED - Bambach, Markus T1 - Mathematical Modeling and Optimization for Powder-Based Additive Manufacturing T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.158 SN - 2351-9789 VL - 47 SP - 1159 EP - 1163 ER - TY - GEN A1 - Jedynak, Angelika A1 - Sviridov, Alexander A1 - Bambach, Markus A1 - Beckers, Daniel A1 - Graf, Gregor ED - Bambach, Markus T1 - On the Potential of Using Selective Laser Melting for the Fast Development of Forging Alloys at the Example of Waspaloy T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.138 SN - 2351-9789 VL - 47 SP - 1149 EP - 1153 ER - TY - GEN A1 - Sefidi, Moein Pakdel A1 - Israr, Rameez A1 - Buhl, Johannes A1 - Bambach, Markus ED - Bambach, Markus T1 - Rule-Based Path Identification for Direct Energy Deposition T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/jpromfg.2020.04.133 SN - 2351-9789 VL - 47 SP - 1134 EP - 1140 ER - TY - GEN A1 - Breuß, Michael A1 - Buhl, Johannes A1 - Mansouri Yarahmadi, Ashkan A1 - Bambach, Markus A1 - Peter, Pascal T1 - A Simple Approach to Stiffness Enhancement of a Printable Shape by Hamilton-Jacobi Skeletonization T2 - Procedia Manufacturing N2 - The 3D-Printing technology is ready to produce parts with specific properties like individual stiffness. Based on a predefined outer shape, the inner structure of a printed part defines mainly the mechanical features. By Hamilton-Jacobi skeletonization, a stiffness enhancement of a printable shape can be achieved in a way, that a novel AM-corner includes linear axis function. Originating in the field of shape analysis in computer vision and graphics, the so-called medial axis transform (MAT) is designed for the computation of a structure that resembles the bone structure of biological shapes. The input for MAT computation is typically a shape’s boundary. The arising topological skeletons have proven to provide a useful concept for many applications; however, their computation is generally intricate and also known to rely on many parameters, diminishing the accessibility of skeletonization methods. In this work, the classical Hamilton-Jacobi skeletonization approach is adopted to compute a stability enhancing shape structure. As the basic method has not been designed for the context of additive manufacturing, a set of suitable modifications are introduced to design an algorithm that suits our intended purpose. Unlike the traditional skeletonization schemes, the resulting method appears to be robust and in practice almost completely automated as we can identify useful generic parameter settings. By a finite element method (FEM) study, the elastic stress properties of the AM-corner with linear axis function is validated and printed with in metal (1.4404) with the 3D Selected Laser Melting (SLM) system AconityMIDI. The AM-knot with skeletonization guides approximately 20 times better than a standard knot. While the first obtained results are shown as 2.5 dimensional shapes, it is emphasized that the proposed algorithm offers many possibilities for extensions to three dimensions and variations in context of additive manufacturing. KW - Skeletonization KW - Hamilton-Jacobi skeletonization KW - stiffness enhancement KW - 3D printing KW - additive manufacturing Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.147 SN - 2351-9789 N1 - 23rd International Conference on Material Forming (ESAFORM 2020) VL - Vol. 47 SP - 1190 EP - 1196 ER - TY - GEN A1 - Buhl, Johannes A1 - Hart-Rawung, Thawin A1 - Bambach, Markus T1 - Nutzung von Neuralen Netzen zur effizienten Auslegung des Presshärtens von 22MnB5 T2 - Tagungsband zum 15. Erlanger Workshop Warmblechumformung, Erlangen, den 17. November 2020 Y1 - 2020 SN - 978-3-00-066911-8 SP - 99 EP - 112 PB - Lehrstuhl für Fertigungstechnologie, Friedrich-Alexander-Universität Erlangen-Nürnberg CY - Erlangen ER - TY - GEN A1 - Bähr, Martin A1 - Buhl, Johannes A1 - Radow, Georg A1 - Schmidt, Johannes A1 - Bambach, Markus A1 - Breuß, Michael A1 - Fügenschuh, Armin T1 - Stable honeycomb structures and temperature based trajectory optimization for wire-arc additive manufacturing T2 - Optimization and Engineering N2 - We consider two mathematical problems that are connected and occur in the layer-wise production process of a workpiece using wire-arc additive manufacturing. As the first task, we consider the automatic construction of a honeycomb structure, given the boundary of a shape of interest. In doing this, we employ Lloyd’s algorithm in two different realizations. For computing the incorporated Voronoi tesselation we consider the use of a Delaunay triangulation or alternatively, the eikonal equation. We compare and modify these approaches with the aim of combining their respective advantages. Then in the second task, to find an optimal tool path guaranteeing minimal production time and high quality of the workpiece, a mixed-integer linear programming problem is derived. The model takes thermal conduction and radiation during the process into account and aims to minimize temperature gradients inside the material. Its solvability for standard mixed-integer solvers is demonstrated on several test-instances. The results are compared with manufactured workpieces. KW - Mixed-integer linear programming KW - Geometric optimization KW - Eikonal equation KW - Heat transmission KW - Additive manufacturing KW - Centroidal Voronoi tesselation Y1 - 2021 U6 - https://doi.org/10.1007/s11081-020-09552-5 SN - 1573-2924 VL - 22 IS - 2 SP - 913 EP - 974 ER - TY - GEN A1 - Eisentraut, Mark A1 - Stendal, Johan Andreas A1 - Bolz, Sebastian A1 - Bambach, Markus A1 - Weiß, Sabine T1 - Applying a softening adapted acceleration to the hot deformation of TNM-B1 T2 - MRS Fall Meeting 2020 N2 - Hot isostatically forged TiAl turbine blades made of TNM-B1 are commercially used in aircraft engines, as they offer significantly lower weight than the traditional nickel-based blades while exhibiting similar strength. Like other TiAl alloys, TNM-B1 displays high peak stress followed by a strong softening behavior (i.e. stress reduction) during hot deformation. This softening can be used to accelerate the deformation process by reducing the processing time and in turn the costs for TNM-B1 parts. In order to avoid increased damage during the accelerated process, a pre-heat treatment (HT) for the hot isostatically pressed material (HIP) is required. To simulate the accelerated forming process, hot compression tests were performed with a DIL805A/D/T dilatometer from TA Instruments (New Castle, Delaware, USA) with different strain rates (0.0013, 0.005, 0.01 and 0.05) and temperatures (T=1150, 1175 and 1200°C). Deformation of the heat-treated state revealed lower flow stress (in both, peak stresses and steady state stresses) and fewer voids compared to the HIP state (Fig. 1.a). The compression test data were used to develop material and temperature specific strain rate profiles based on a material model. Subsequently, hot compression tests were performed with different strain rate profiles (starting strain rates 0.0013 and 0.0052) for the HIP and the HT state. The results were evaluated with regard to their microstructure, deformation, and damage behavior. A reduction of the processing time for all tested strain rates profiles by factors 2-3 could be achieved compared to constant strain rates. Furthermore, the results indicated that the deformation with strain rate profiles (compared to constant strain rates) did not significantly change the resulting microstructure or damage tolerance of the HT state. 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