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Characterization of Microstructure and Chemical Microinhomogeneity of HP40NbTi Cast Alloy After Different Crystallization Rates

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Abstract

The mechanism of formation of chemical inhomogeneity of phases during crystallization at the melt cooling rate in the range of 1–1000 K/s in the heat-resistant HP40NbTi alloy is studied by optical microscopy, electron microscopy, electron microprobe analysis, and x-ray mapping. The forming process of the phase’s chemical compositions in a multicomponent HP40NbTi alloy during crystallization is complex and extremely unstable. The resulting alloy phases are characterized by significant chemical heterogeneity, degree of which is largely determined by the melt cooling rate. The most degree of chemical inhomogeneity of phases occurs when the melt cooling rate is 100–300 K/s, which corresponds to the conditions of welding and cladding, involving the process of alloys drip meltdown of electrode materials and their solidification on cooled surfaces.

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  1. Higher School of Physics and Materials Technologies, Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia, 195251

    Sergey Yu. Kondrat’ev & Grigoriy P. Anastasiadi

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  1. Sergey Yu. Kondrat’ev
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  2. Grigoriy P. Anastasiadi
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Correspondence to Sergey Yu. Kondrat’ev.

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Kondrat’ev, S.Y., Anastasiadi, G.P. Characterization of Microstructure and Chemical Microinhomogeneity of HP40NbTi Cast Alloy After Different Crystallization Rates. Metallogr. Microstruct. Anal. 10, 675–683 (2021). https://doi.org/10.1007/s13632-021-00794-y

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