Lightweight Design Using Local Heat Treatment of Cold Rolled Steels
- 49 Downloads
The Institute of Metal Forming and Fraunhofer ILT combine cold rolling of steel sheets with subsequent local laser heat treatment. This enables them to produce sheets with customized formability and crash behavior that at the same time offer potential for automotive lightweight design.
Partially Heated Steel
Current lightweight design concepts promote the development of high strength steels, which often involve limited formability. In order to benefit from the advantages of high strength, the approach of so-called Tailor Heat Treated Blanks (THTB) is to restore the formability locally before the actual forming process . The critical areas in the sheet are subjected to a heat treatment, while the remaining areas retain their high strength. The subsequent forming operation takes place at room temperature. In addition to increasing the formability of semi- finished products, the adjustment of a tailored property distribution can be used to improve the functionality of the finished...