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Contents of the issue
1E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
2I.M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine
3 Krzhyzhanovskyi Str., 0312, Kyiv, Ukraine
Abstract In the work the authors studied the problems of laser welding of joints of high-entropy alloy of Nb–Cr–Ti–Al–Zr system.
The results of differential thermal analysis of the initial material are presented. Results of X-ray phase analysis
of the alloy were analyzed. A conclusion was made about existence of bcc solid solution based on niobium and solid
solution based on ZrCr2 intermetallics in the alloy, as well as existence of two niobium-based solid solutions with
different chemical composition in the alloy. Analysis of the influence of alloy crystallization rate on its microstructure
was performed. It is shown that the ratio of the quantity of dendrites and eutectic can change, depending on the cooling
rate. Obtained results of investigations on formation of a dendrite structure were furtheron used at optimization of laser
welding modes. In this work the authors studied the influence of such parameters as radiation power and laser welding
speed on weld microstructure formation. Mechanical properties of butt joints at uniaxial static tension were studied.
It was found that material softening which leads to destruction is influenced by the feature of distribution of residual
thermal stresses that is determined by the mode of heat input and removal during welding. It is shown that formation
of the majority of the defects is related to a feature of nonequilibrium crystallization of multicomponent high-entropy
high-temperature alloys. In order to prevent their formation, it is rational to take measures for optimizing the technology
parameters, aimed at increasing the melt cooling rate, in order to produce a more equilibrium structure. 15 Ref.,
Keywords: multicomponent high-entropy alloy, laser welding, butt joints, structure, mechanical properties, defects
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