For the production of lightweight components with high strength and good formability, optimized materials are needed. Metallic compounds offer the opportunity for application-oriented material properties. In the following example the compound production through accumulative roll bonding (ARB) for a TRIP-TWIP material is shown. The monolithic materials are respectively an X3CrMnNi-16-7-6 and an X3CrMnNi-16-7-9 steel. A special role is attributed to the surface properties and the cladding parameters. The influence of those parameters will be shown with experiments and numerical simulation.
Accumulative roll bonding was used to produce steel composite materials with improved ductility at a higher tensile strength. With ARB this process is repeated with the already roll bonded materials to achieve a fine or ultra-fine-grained structure. [1] While producing a TRIP-TWIP layered compound is a first step, the challenge consists in an improvement of the necessary bond strength while keeping the reduction at 50 % to ensure an industrial application. In order to achieve these goals, experiments with and without an intermediate layer of nickel foil were conducted. Different foil thicknesses between 25 and 150 µm were used to determine an optimum layer ratio with a rolling temperature of 440 °C.
To further improve the understanding of the roll bonding process and the development of the bond strength, a fast rigid-plastic analytical simulation for material flow and bond strength development was adopted, which is based on the works of Schmidtchen [2]. The collection of further experimental data aimed at refining the simulation for better process insights is an ongoing task.


References
[1] Y. Saito; Acta mater., 1999, Vol. 47, 579-583.
[2] M. Schmidtchen; Freiberger Forschungshefte, 2016, Vol. 372.