Schirdewahn S, Spranger F, Hilgenberg K, Merklein M (2019)
Publication Language: English
Publication Type: Conference contribution, Conference Contribution
Publication year: 2019
Publisher: Wissenschaftliche Skripten
Pages Range: 357-365
Conference Proceedings Title: Hot Sheet Metal Forming of High-Performance Steel CHS²
Over the last years, the weight of modern car bodies has risen significantly due to the increasing customers’ demand for comfort and safety equipment. However, this ongoing trend leads to an increasing fuel consumption and thus to higher carbon dioxide emissions. In order to counteract these problems, hot stamping has been established in the automotive industry as a key technology for lightweight construction, regarding the manufacturing of safety-relevant car body components. Hot stamped parts are commonly made out of boron-manganese steel 22MnB5, which is initially austenized and subsequently formed and quenched in one process step. As a result, geometrical complex structures with an ultimate tensile strength of 1500 MPa are generated. The surfaces of the workpieces are coated with an Al-Si layer to avoid oxide scale formation and to ensure corrosion protection. However, the coating system leads to an increased adhesive wear on the tool surface due to the high thermo-mechanical tool stresses. Therefore, a time and cost consuming rework of the hot stamping tools is required. The aim of this study is to increase the tribological performance of hot stamping tools by using a laser implantation process. This technique allows the manufacturing of separated, elevated and dome-shaped microstructures on the tool surface in consequence of a localized dispersing of hard ceramic particles by pulsed laser radiation. The generated surface features offer great potential for reducing the tribological load, due to their high hardness and wear resistance. For this purpose, the friction coefficient of unmodified and laser implanted tool surfaces were examined and compared by using a modified pin-on-disk test. In addition, the surfaces were analyzed by optical measurements in order to quantify the amount of wear.
Schirdewahn, S., Spranger, F., Hilgenberg, K., & Merklein, M. (2019). Tribological performance of localized dispersed X38CrMoV5-3 surfaces for hot stamping of Al-Si coated 22MnB5 sheets. In Oldenburg M, Hardell J, Casellas D (Eds.), Hot Sheet Metal Forming of High-Performance Steel CHS² (pp. 357-365). Luleå, SE: Wissenschaftliche Skripten.
Schirdewahn, Stephan, et al. "Tribological performance of localized dispersed X38CrMoV5-3 surfaces for hot stamping of Al-Si coated 22MnB5 sheets." Proceedings of the 7th International Conference Hot Sheet Metal Forming of High-Performance Steel, Luleå Ed. Oldenburg M, Hardell J, Casellas D, Wissenschaftliche Skripten, 2019. 357-365.