@misc{BuhlHaertelBesong, author = {Buhl, Johannes and H{\"a}rtel, Sebastian and Besong, Lemopi Isidore}, title = {Temperature Control of the Two-Point Incremental Forming Process to Achieve Homogeneous Martensite Content Based on Finite Element Simulations}, series = {Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity, ICTP 2023 - Volume 1}, journal = {Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity, ICTP 2023 - Volume 1}, editor = {Mocellin, Katia}, publisher = {Springer}, address = {Cham}, isbn = {978-3-031-41022-2}, issn = {2195-4356}, doi = {10.1007/978-3-031-41023-9_74}, pages = {739 -- 747}, abstract = {Deformation-induced martensite has been observed in the incremental sheet forming of metastable austenitic stainless steels (MASS). The presence of martensite improves the characteristics of the springs. Martensite transformation usually occurs at low temperatures (<70 ℃). Depending on the tool speed, incremental forming of disk springs requires between 3 to 5 min. The forming time needs to be short to increase the process output in industrial settings. However, accelerating the process leads to high temperatures above the martensite transformation temperature that suppress martensite formation, necessitating temperature control during forming. It is suggested to enhance the martensite content of the blank by cooling during the forming operation. In this contribution, two-point incremental sheet forming is conducted to determine the influence of process temperature on the phase content of MASS disk springs. A temperature-dependent phase change material model that includes the strain rate effect is implemented in finite element (FE) simulations to predict the martensite content. FE simulations are performed to investigate the convection coefficients and cooling time leading to process temperatures below 70 ℃. The framework can be used to control and speed up the incremental forming of disk springs while maintaining a high martensite content.}, language = {en} } @misc{HussainHassanWeietal., author = {Hussain, G. and Hassan, Malik and Wei, Hongyu and Buhl, Johannes and Xiao, Maohua and Iqbal, Asif and Qayyum, Hamza and Riaz, Asim Ahmed and Muhammad, Riaz and Ostrikov, Kostya}, title = {Advances on Incremental forming of composite materials}, series = {Alexandria Engineering Journal}, volume = {Vol. 79}, journal = {Alexandria Engineering Journal}, issn = {1110-0168}, doi = {10.1016/j.aej.2023.07.045}, pages = {308 -- 336}, language = {en} } @misc{HartRawungHornBuhletal., author = {Hart-Rawung, Thawin and Horn, Alexander and Buhl, Johannes and Bambach, Markus and Merklein, Marion}, title = {A unified model for isothermal and non-isothermal phase transformation in hot stamping of 22MnB5 steel}, series = {Journal of Materials Processing Technology}, volume = {313}, journal = {Journal of Materials Processing Technology}, issn = {1873-4774}, doi = {10.1016/j.jmatprotec.2023.117856}, language = {en} } @incollection{IsrarBuhl, author = {Israr, Rameez and Buhl, Johannes}, title = {An Introduction to Additive Manufacturing (AM) of Metals and Its Trends in Wire-Arc Additive Manufacturing (WAAM) Simulations}, series = {Machine Tools : An Industry 4.0 Perspective}, booktitle = {Machine Tools : An Industry 4.0 Perspective}, editor = {Khan, Wasim Ahmed}, publisher = {CRC Press}, address = {Boca Raton}, doi = {10.1201/9781003220985}, pages = {12}, language = {en} }