Abstract
ABSTRACT Hot stamping is an effective method to improve both the elongation and plasticity of ultra-high strength steels, thus a higher specific strength could be achieved, making it possible for weight reduction in motor vehicles. However, due to the die temperature rise and the cooling liquid within hot stamping applications, the friction in its forming stage is always a non-isothermal mode. Therefore, a high-temperature sliding-on-sheet-strip (SOSS) tribo-tester to simulate sliding friction in hot stamping of 22MnB5 hot stamping steel sheet was designed and custom-made. Then, it was employed to exploit High-temperature friction behavior and mechanism of bare 22MnB5 hot-stamping boron steel sheet under different die temperature and extra cooling conditions. Results show that the friction coefficient obtained under the pure die cooling conditions is lower than that obtained under extra cooling conditions, which is attributed to the formation of thicker oxide layers on the surface of specimen during the cooling process. In addition, the friction coefficient is obviously decreased when the die temperature increased to 200 °C, which is ascribed to the co-action of the destruction of the oxide layers and the formation of bainite.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
