Analysis of the application potential of roll-clad MnB-Cr steel composites for press hardening

• Applicants: Professor Dr.-Ing. Gerhard Hirt; Professor Dr.-Ing. A. Erman Tekkaya
• Subject Area: Primary Shaping and Reshaping Technology, Additive Manufacturing ; Metallurgical, Thermal and Thermomechanical Treatment of Materials
• Term: from 2020 to 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 444548865

• Final Report Year: 2024

Final Report Abstract

In this project a new type of composite material for press hardening was investigated, which promises environmental and energy benefits during press hardening due to the substituted AlSi coating by roll-bonded cover layers. For this purpose, the required thermos-mechanical material parameters (flow behavior/diffusion properties) for production were determined. Rollbonding solutions were successfully realized for the combination of an austenitic cover layer (X5CrNi18-10) and a boron-manganese core (22MnB5) despite the occurring challenges. In addition, the base materials and the resulting semi-finished product were characterized under application-oriented aspects in the temperature range of forming (600-900 °C). Here, the flow behavior (stress and forming limit changes) during forming is considered and rules for predicting the bond are developed. With numerical calculations and material data, a press hardening tool was developed and manufactured for the production of demonstration parts. Finally, the properties of the demonstrator components were analyzed as a function of the compound composition and the usability of the new semi-finished product was confirmed with regards to hardenability and dimensional accuracy.

Publications

• Novel Roll-Bonded Stainless Steel/Boron-Steel Multilayer Under Hot Stamping Conditions. The Minerals, Metals & Materials Series, 2683-2694. Springer International Publishing.
  Kamaliev, Mike; Teller, Marco; Löbbe, Christian; Hirt, Gerhard & Tekkaya, A. Erman
  
• “Bewertung der Verbundfestigkeit von walzplattierten Chrom-Bor-Stahl-Verbunden zum Presshärten,” in Ideen Form geben: 36. ASK Umformtechnik : 26.-27. Oktober 2022, Eurogress Aachen : Tagungsband, 1st ed. Aachen: Verlagshaus Mainz GmbH, 2022.
  M. Stennei & al.
  
• “Evaluation of the Bond Strength of Roll Clad Chromium-Boron Steel Composites for Hot Stamping,” Barcelona, 2022.
  M. Stennei & al.
  
• “Einfluss der Herstellungsroute auf die Umformbarkeit von Cr-Mn-Verbundwerkstoffen für das Presshärten,” 2023.
  M. Stennei & al.
  
• Material Properties of a Roll-Cladded Steel Composite Designed for Press Hardening With Rapid Heating. CHS² 2024 Proceedings, 53-59. AIST.
  Grodotzki, J.; Tekkaya, A. & Stennei, M.
  
• “Experimental and Numerical Studies on the Roll Bonding of Manganese/stainless Steel for Press Hardening,” in Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity, 2024
  M. M. Acuña & al.