Applying a modified austenite transformation model into a thermo-mechanical model of hot stamping
Abollahpoor, Amir, Chen, Xiangjun, Pereira, Michael, Asgari, Alireza, Xiao, Namin and Rolfe, Bernard 2013, Applying a modified austenite transformation model into a thermo-mechanical model of hot stamping, in IDDRG 2013 : Proceedings of the International Deep-Drawing Research Group. Conference, Institute of Virtual Manufacturing, Zurich, Switzerland, pp. 155-160.
Hot stamping is an innovative forming process for the production of vehicle body parts with complicated geometries and high strength. In this process, hot sheet metal is formed within a die and cooled down at the same time. The cooling rates are critical to the final microstructure and thus the final mechanical properties of the part in service (strength, ductility, energy absorption ability). Therefore, an accurate model that can predict the thermo-mechanical-metallurgical characteristics of the process is increas-ingly important. In this paper, a thermo-mechanical finite element model of hot stamping is created and a modified phase transformation model based on Scheil’s additive principle has been applied. The comparison between the modeling and experiment shows that the modified phase transformation model coupled with the incubation time provides higher accuracy on the simulation of transformation kinetics history. In the stamp-ing process, the effect of different die materials and increasing the die temperature to reduce the sheet cool-ing rate is analyzed in this paper. This work demonstrates the application of the combined thermo-mechanical-metallurgical model in hot stamping. Additionally, the results provide insights into the use of locally differentiated cooling rates, either via local die material changes or selective heating, to produce tailored mechanical properties in hot stamped components.
Field of Research
091207 Metals and Alloy Materials 091006 Manufacturing Processes and Technologies (excl Textiles)
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