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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 16a
SUMMARY:Medium manganese steels for press hardening application
DESCRIPTION:Press hardening of manganese-boron steels is one of the most efficient production processes for high strength automotive sheet components. However, the energy absorption capacity of these components is greatly limited by the formation of fully martensitic microstructure during in-die quenching. In order to extend the application range of press hardened components, the use of third-generation advanced high strength steels, especially medium manganese steels, achieves increasing attention. The alloying concept of these steels allows the critical cooling rate and the Ac3-temperature to be significantly lowered compared to manganese-boron steels, resulting in a lower austenitizing temperature and shorter cycle times. 
Aim of the presented research is to analyze the potential of press hardening of lean medium manganese steels with an integrated intercritical annealing or quenching & partitioning treatment. Therefore, different heat treatments were performed on Fe-0.3%C-5%Mn-1.5%Si and Fe-0.2%C-7%Mn-0.2%Si. By adjusting the heat treatment parameters, the microstructure and hence the mechanical properties can be modified to fit the application´s load requirements. The results demonstrate that both treatment strategies lead to complex multi-phase microstructures, which have been analyzed in detail by a combination of EBSD and EPMA. Optimization in heat treatment results not only in high tensile strength, comparable to martensitic 22MnB5, but also in significantly improved total elongation. Regarding the ductility, it was shown that besides the adjustment of a sufficient retained austenite content, the reduction of fresh martensite is indispensable to prevent brittle failure. Finally, selected heat treatments were reproduced in a laboratory-scale press hardening with temperature-controlled hat-shaped pressing tool.

CLASS:PUBLIC
DTSTART:20230614T143000
DTEND:20230614T145000
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