This dataset contains the results of investigations carried out on two newly developed high-strength austenitic steels with the following chemical compositions: 21Mn–1.5Si–4Al–Nb–Ti and 23Mn–1.5Si–1Al–Nb–Ti. The chemical composition of both alloys was verified in an accredited chemical analysis laboratory.
The experimental heats were produced in a medium-frequency induction melting furnace (Radyne AMF 45/150) equipped with a rammed refractory crucible. The molten steel was cast into ceramic moulds under controlled processing conditions.
The cast ingots were subsequently subjected to hot open-die forging using a laboratory hydraulic press with a maximum press capacity of 5 MN, followed by hot rolling on a laboratory two-high rolling mill equipped with 300 mm diameter work rolls.
The structural characterization dataset includes X-ray diffraction (XRD) patterns, optical microscopy (OM) micrographs, scanning electron microscopy (SEM) images, fracture surface observations, and elemental distribution maps obtained by energy-dispersive X-ray spectroscopy (EDS).
The dataset also contains the results of high-temperature brittleness investigations performed using a Gleeble 3800 thermomechanical simulator. Based on high-temperature tensile tests, the following characteristic temperatures were determined: Nil-Strength Temperature (NST), Nil-Ductility Temperature (NDT), Ductility Recovery Temperature (DRT).
These data were subsequently used to determine the High-Temperature Brittleness Range (HTBR) of the investigated steels.
In addition, the dataset includes thermodynamic simulation results used to determine the liquidus temperature, as well as experimental thermal analysis data obtained using Differential Scanning Calorimetry (DSC) for verification of the simulated results.
(2026-06-09)
