Abstract
The solidification path and the σ-phase precipitation mechanism of UNS S31254 alloy were studied on the basis of directional solidified experiments accompanied by scanning electron microscopy observations and energy dispersive X-ray a nalysis. The resulting temperatures of solidification paths and phase transformation were compared with Gulliver-Scheil and equilibrium calculations predicted using ThermoCalc© software. It was confirmed that the experimental solidification path was in agreement with the thermodynamic calculations. The complementarity of the results have made it possible to propose a solidification path and a σ-phase precipitation mechanism for the UNS31254 steel.
Highlights
Stainless steels are an important class of materials
The directional solidification is achieved by pulling the alumina tube and the sample along the vertical axis at a constant solidification velocity (V = 5.10-5 m/s)
The dendrites grow along a direction close to the thermal gradient
Summary
Stainless steels are an important class of materials. They are used everywhere, from daily life applications as cooking utensils to space vehicles. A quenching directional solidification (QDS) set-up was used in parallel with ThermoCalc© simulations to establish the solidification path and the σphase transformation mechanism of the steel. The directional solidification is achieved by pulling the alumina tube and the sample along the vertical axis at a constant solidification velocity (V = 5.10-5 m/s).
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