Title: The influence of niobium on the resulting structure of trip steels during the continuous cooling
Authors: Jirková, Hana
Bublíková, Dagmar
Opatová, Kateřina
Volkmannová, Julie
Citation: JIRKOVÁ, H., BUBLÍKOVÁ, D., OPATOVÁ, K., VOLKMANNOVÁ, J. The influence of niobium on the resulting structure of trip steels during the continuous cooling. In: Conference Proceedings - METAL 2018 - 27th International Conference on Metallurgy and Materials. Ostrava: TANGER Ltd., Keltickova 62, 710 00 Ostrava, Czech Republic, EU, 2018. s. 712-717. ISBN 978-80-87294-84-0.
Issue Date: 2018
Publisher: Tanger
Document type: konferenční příspěvek
URI: 2-s2.0-85059401580
ISBN: 978-80-87294-84-0
Keywords in different language: TRIP steel;niobium;continuous cooling;retained austenite
Abstract in different language: High strength multiphase TRIP steels are very often used as structural materials, especially in the automotive industry. Due to their ability to absorb energy during the impact, they are used for safety components of the car body. These parts can be produced by a hot stamping process, which has the advantage of using lower forming forces and a smaller spring back effect. The problem during heat treatment of TRIP steels is the holding time in the region of bainitic transformation, which facilitates bainite formation and stabilization of retained austenite. In the present study, two low-alloy TRIP steels with and without niobium were chosen. Physical simulation was employed to test an alternative route without an isothermal hold during cooling after hot stamping. Several continuous cooling profiles from the tool temperature were applied. The results were compared with isothermal processing in the region of bainitic transformation. Mixed structures consisting of bainite, martensite, ferrite and retained austenite were obtained for both steels. The ultimate strength reached more than 900 MPa with the elongation A20mm over 15 %.
Rights: Plný text je přístupný v rámci univerzity přihlášeným uživatelům.
© Tanger
Appears in Collections:Konferenční příspěvky / Conference Papers (RTI)

Please use this identifier to cite or link to this item: http://hdl.handle.net/11025/30905

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