Material characterization on tubular parts through temperature assisted media based forming

In this project, the recently developed high-temperature tube expansion test (“Hot-Tube-Bulge-Test”) is to be developed further. In this process, steel tubes are first heated to temperatures of up to 1000 °C by direct resistance heating. Subsequently, internal pressure is applied by gas in combination with a superposed axial feed to set different strain paths on the tube surface. From this, friction-free failure criteria in the form of high-temperature forming limit curves (FLCs) can be derived in post-processing. In addition, this project aims to investigate the potential of determining flow curves using the Hot-Tube-Bulge-Test.

Particular focus will be placed on verifying the results with regard to parameter changes (temperature, strain rate, wall thickness, etc.) and the applicability of the failure criteria in hot forming processes. By controlling the expansion locus, the possibility of characterizing the mechanical properties of weld seams in welded tubes will also be investigated.

M. Kamaliev, F. Kolpak, A. E. Tekkaya, 2022

Isothermal hot tube material characterization – Forming limits and flow curves of stainless steel tubes at elevated temperatures. Journal of Materials Processing Technology (309).
https://doi.org/10.1016/j.jmatprotec.2022.117757