Modeling Element Redistribution in the Liquid Phase During Ultrafast Solidification Induced by High-Current Electron Beam Exposure

This article examines approaches to modeling extreme nonequilibrium mass transfer phenomena that occur during the irradiation of high-current electron beams in tool steels, particularly in the context of ultrafast solidification of the molten surface layer. The study investigates the redistribution of elements in P18 steel across the grain area after exposure to a high-current electron beam with an energy of 400 keV, a current density of up to 2 kA/cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>, and a pulse duration of 0.2 μs, A physical and mathematical model of the redistribution process is proposed, and calculations are presented that are consistent with experimental data.