Improving the crash behavior of structural components made of advanced high strength steel by local heat treatment

IDDRG2016 conference on "Challenges in Forming High-Strength Sheets".

Conrads, L.^1 ; Daamen, M.^1 ; Hirt, G.^1 ; Bambach, M.^2

Institute of Metal Forming, RWTH Aachen University, Intzestr. 10, Aachen

52056, Germany^1

Department of Mechanical Design and Manufacturing, BTU Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, Cottbus

03046, Germany^2

关键词: Advanced high strength steel;    Deformation path;    High manganese;    Local heat treatment;    Microstructure and mechanical properties;    Second generation;    Strip materials;    Structural component;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/159/1/012024/pdf
DOI  :  10.1088/1757-899X/159/1/012024

来源: IOP

【 摘 要 】

High manganese TWIP steel belongs to the second generation of advanced high strength steels. During the production of strip material, the microstructure and hence the mechanical properties of TWIP steel can be adapted to the specific needs of crash relevant structures. Whereas typically the whole steel strip is heat-treated after cold rolling, a local heat treatment can be applied to tailor the properties accordingly. In this work, a method is presented to identify a suitable process window for the local laser heat treatment of TWIP steel. The material is strain hardened and afterwards heat-treated at various temperatures for a short time. The influence of the respective heat treatment on microstructure and mechanical properties is evaluated and the most appropriate heat treatment is then reproduced using laser heating. To verify the effect of a local laser heat treatment at a structural component, crash boxes with different heat treatment patterns were produced and tested. The dynamic crash tests show that the local heat treatment can be used to improve the crash behavior of structural components. In addition, their deformation path can be influenced by using adapted heat treatment patterns and the crash behavior can be controlled.