TY - GEN A1 - Imran, Muhammad A1 - Afzal, Muhammad Junaid A1 - Bambach, Markus T1 - Analysis of competition between onset of dynamic recrystallization and damage nucleation during hot forming T2 - NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes Y1 - 2019 UR - http://www.programmaster.org/PM/PM.nsf/ApprovedAbstracts/8A21E11BABCC7A4F852583460038CCA3?OpenDocument SN - 978-0-87339-769-8 SP - 231 EP - 234 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 - 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 - 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 - CHAP A1 - Bambach, Markus A1 - Imran, Muhammad A1 - Buhl, Johannes A1 - Härtel, Sebastian A1 - Awiszus, Birgit ED - Szeliga, Danuta ED - Rauch, Łukasz T1 - Towards intelligent materials testing with reduced experimental effort for hot forming T2 - KomPlasTech 2017 : XXIV International Conference on Computer Methods in Materials Technology, January 15-18, 2017, Zakopane, Poland : book of abstracts KW - Intelligent materials testing KW - Hot working Y1 - 2017 SN - 978-83-947091-0-5 SP - 72 EP - 73 PB - AKNET-PRess CY - Krakow ER - TY - GEN A1 - Imran, Muhammad A1 - Bambach, Markus T1 - A new model for dynamic recrystallization under hot working conditions based on critical dislocation gradients T2 - Procedia Engineering KW - Hot working KW - Dynamic recrystallization KW - Dislocation density gradient Y1 - 2017 U6 - https://doi.org/10.1016/j.proeng.2017.10.1111 SN - 1877-7058 N1 - International Conference on the Technology of Plasticity, ICTP 2017, 17-22 September 2017, Cambridge, United Kingdom VL - 207 SP - 2107 EP - 2112 ER - TY - GEN A1 - Imran, Muhammad A1 - Kühbach, Markus A1 - Roters, Franz A1 - Bambach, Markus T1 - Development of a Model for Dynamic Recrystallization Consistent with the Second Derivative Criteron T2 - Materials (Basel) Y1 - 2017 U6 - https://doi.org/10.3390/ma10111259 SN - 1996-1944 VL - 10 IS - 11 ER - TY - GEN A1 - Imran, Muhammad A1 - Bambach, Markus ED - Fratini, Livan ED - Di Lorenzo, Rosa ED - Buffa, Gianluca ED - Ingarao, Guiseppe T1 - Towards the damage evaluation using Gurson-Tvergaard-Needleman (GTN) model for hot forming processes T2 - Proceedings of the 21st International ESAFORM Conference on Material Forming, ESAFORM 2018, Palermo, Italy, 23-25 April 2018 Y1 - 2018 SN - 978-0-7354-1663-5 U6 - https://doi.org/10.1063/1.5035063 PB - AIP Publishing CY - Melville, New York 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 - Bambach, Markus A1 - Imran, Muhammad A1 - Sizova, Irina A1 - Buhl, Johannes A1 - Gerster, Stephan A1 - Herty, Michael T1 - A soft sensor for property control in multi-stage hot forming based on a level set formulation of grain size evolution and machine learning T2 - Advances in Industrial and Manufacturing Engineering Y1 - 2021 U6 - https://doi.org/10.1016/j.aime.2021.100041 SN - 2666-9129 IS - 2 ER - TY - GEN A1 - Bambach, Markus A1 - Herty, Michael A1 - Imran, Muhammad T1 - Feedback stabilization of forming processes T2 - arXiv Y1 - 2021 UR - https://arxiv.org/abs/2104.04985 ER - TY - GEN A1 - Bambach, Markus A1 - Gerster, Stephan A1 - Herty, Michael A1 - Imran, Muhammad T1 - Feedback control for random, linear hyperbolic balance laws T2 - International Journal for Uncertainty Quantification KW - systems of hyperbolic balance laws KW - feedback stabilization KW - Lyapunov function KW - stochastic Galerkin KW - viscoplastic deformations Y1 - 2022 U6 - https://doi.org/10.1615/Int.J.UncertaintyQuantification.2021037183 SN - 2152-5099 VL - 12 IS - 2 SP - 81 EP - 104 ER - TY - GEN A1 - Imran, Muhammad A1 - Deillon, Léa A1 - Sizova, Irina A1 - Neirinck, Bram A1 - Bambach, Markus T1 - Process optimization and study of the co-sintering behaviour of Cu-Ni multi-material 3D structures fabricated by spark plasma sintering (SPS) T2 - Materials & Design KW - Multi-material KW - Spark plasma sintering KW - Sintering behavior KW - Master sintering curve KW - Master sintering surface Y1 - 2022 U6 - https://doi.org/10.1016/j.matdes.2022.111210 SN - 0264-1275 VL - Vol. 223 ER - TY - GEN A1 - Safari, Athar A1 - Imran, Muhammad A1 - Weiss, Sabine T1 - A Comparative Study on Modified Johnson–Cook and Arrhenius-Type Constitutive Models to Predict the Hot Deformation Behaviour of Molybdenum-Hafnium-Carbide Alloy T2 - Journal of Materials Engineering and Performance N2 - Molybdenum alloys are commonly used as tool material for high-temperature deformation processes like forming or forging. For these types of application, the material has to withstand static load at elevated temperatures. To investigate the high-temperature performance of the material, uniaxial hot tensile tests were performed on a Mo-1.2% Hf-0.1% C alloy (MHC) over the temperature range of 1173-1473 K with intervals of 100 K and strain rates of 0.001, 0.01 and 0.1 s−1 up to the fracture of the specimen. The flow stress decreases with increase in temperature and the reduction in strain rate. This behaviour could be related to the increasing rate of restoration mechanisms, i.e. dynamic recrystallization or recovery as well as to the decrease in the strain hardening rate. Microstructure of the two most critical hot deformation conditions were shown and compared. Based on modified Johnson–Cook and strain-compensated Arrhenius-type models, constitutive equations were established to predict the high-temperature flow stress of the respective MHC alloy. The accuracy of both models was evaluated by comparing the predicted stress values and the values obtained from experiments. Correlation coefficient, average absolute relative error, the number of material constants involved and the computational time required for evaluating the constants were calculated to quantify and compare the precision of both models. The flow stress values predicted by the constitutive equations are in good agreement with the experimental results. At lower strain rates (0.001 and 0.01 s−1), distinct deviation from the experimental results can be observed for the modified Johnson–Cook model. Despite the longer evaluation time and the larger number of material constants, the deformation behaviour, tracked by the Arrhenius-type model is more accurate throughout the entire deformation process. KW - constitutive equation KW - flow stress KW - hot tensile deformation KW - molybdenum-hafnium-carbide alloy (MHC) Y1 - 2021 U6 - https://doi.org/10.1007/s11665-021-05464-2 SN - 1059-9495 SN - 1544-1024 VL - 30 IS - 3 SP - 1945 EP - 1956 ER -