Wear in Hot Stamping by Partition Heating

• Main Authors: Yanhong Mu, Enrico Simonetto, Marco Scagnolari, Andrea Ghiotti
• Format: Article
• Language: English
• Published: MDPI AG 2020-03-01
• Series: Journal of Manufacturing and Materials Processing
• Subjects: tribology; wear; hot stamping; partition heating; boron steel
• Online Access: https://www.mdpi.com/2504-4494/4/1/18

Hot stamping by partition heating of Al−Si coated boron steel sheets is currently utilized to produce parts of the car body-in-white with tailored microstructural and mechanical characteristics. This paper investigates the evolution of the Al−Si coating and its tribological and wear performances in the case of direct heating at the process temperatures of 700 °C, 800 °C, and 900 °C, skipping the preliminary austenitization as it may happen in the case of tailored tempered parts production. A specifically designed pin-on-disk configuration was used to reproduce at a laboratory scale the process thermo-mechanical cycle. The results show the morphological and chemical variation of the Al−Si coating with heating temperature, as well as that the friction coefficient, decreases with increased temperature. Furthermore, the results proved that the adhesive wear is the main mechanism at the lower temperature, while abrasive wear plays the major role at the higher temperature.