Issues $\rightarrow$ Volume 27, Issue 3 (2026)

Stimulated Structural and Phase Transformations in Near-Surface Layers of Iron-Based Alloys

DANILCHENKO V.Yu., BONDAR V.I., and DZEVIN Ye.M.

G.V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, 36 Acad. Vernadsky Blvd., 03142 Kyiv, Ukraine

Received / final version: 10.09.2025 / 22.07.2026 Download PDF logo PDF

Abstract
The results of studies concerning the formation of the structural state of single crystals and polycrystals of iron and its alloys under sharply unbalanced conditions of pulsed laser treatment are reviewed and analysed. As shown, significant heating–cooling rates during laser treatment result in a decrease in the temperature of the γ–α-transformation and in the formation of the γ-phase. In this case, recrystallization of single crystals of α-iron is observed, as a result of which, a polycrystalline component of α-iron is formed with a b.c.c.-lattice parameter that corresponds to the initial one and, during remelting in a narrow range of energy densities, a single-crystal region of the γ-phase with an increased f.c.c.-lattice parameter and significant texture is formed too. As established, the mechanical properties along the depth of the laser influence zone are determined mainly by structural factors and change according to nonmonotonic curves with a maximum. The influence of energy parameters of pulsed laser irradiation on the formation of wavy microgeometry of the surface is revealed.

Keywords: laser treatment, single crystal of α-iron, structure, austenite, martensite, residual stresses.

DOI: https://doi.org/10.15407/ufm.27.03.***

Citation: V.Yu. Danilchenko, V.I. Bondar, and Ye.M. Dzevin, Laser-Stimulated Structural and Phase Transformations in Near-Surface Layers of Iron-Based Alloys, Progress in Physics of Metals, 27, No. 3: ***–*** (2026)

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