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Experimental-numerical approach to efficient TTT-generation for simulation of phase transformations in thermomechanical forming processes

Autoren:Behrens, B.-A.; Chugreev, A.; Kock, C.
Kategorie:Zeitschriften/Aufsätze (reviewed)
Jahr:2018
Veröffentlichung:IOP Conference Series: Materials Science and Engineering. 461:012040
DOI:10.1088/1757-899X/461/1/012040

Abstract

Residual stresses in components are an important issue in most manufacturing processes, as they influence the performance of the final part. Regarding hot forming processes there is a great potential of defining a targeted residual stress state, due to numerous adjustment parameters like deformation state or temperature profile. In order to ensure appropriate numerical modelling of resulting residual stresses in a thermomechanical process, comprehensive material data regarding phase transformation are required. This paper presents an experimental-numerical procedure to efficiently determine time-temperature-transformation diagrams for cooling simulations after hot forming. The transformation behaviour of the steel alloys 42CrMo4 and 100Cr6 is determined by experiments as well as FE-simulations. Finally, the simulation model is validated by dilatometric experiments and metallographic investigations.