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Study of Chemical Inhomogeneity in Beta-Solidifying TiAl Alloys of Various Composition

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Metallurgist Aims and scope

The results of original research into the structure and statistical distribution of elements alloyed into ingots from a new Russian intermetallic TiAl alloy having two variable compositions (Ti–44.5Al–2V–1Nb–1.5Zr/2.5Cr–0.1Gd, at.%) are presented. The experimental ingots having a nominal weight of 3–30 kg were obtained according to two technological schemes: 1 — triple vacuum arc remelting (VAR + VAR + VAR) with a consumable compacted electrode; 2 — VAR → VAR → single vacuum induction melting (VAR + VAR + VIM) in a cold crucible furnace. The statistical processing of the chemical analysis results was carried out using Shewhart charts. The results indicate a minimum degree of volumetric macrosegregation in the ingots and the almost complete absence of segregation inhomogeneity in Zr- and Cr-containing compositions: the maximum range of Al content over the cross section of triple-remelted ingots was no more than 0.84 at.% (0.42 wt.%), while along the height of the ingots, Al content was no more than 1.87 at.% (0.55 wt.%).

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Authors and Affiliations

  1. All-Russian Research Institute of Aviation Materials, Moscow, Russia

    A. S. Kochetkov, P. V. Panin, N. A. Nochovnaya & M. A. Makushina

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  1. A. S. Kochetkov
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  2. P. V. Panin
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  3. N. A. Nochovnaya
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  4. M. A. Makushina
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Correspondence to A. S. Kochetkov.

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Translated from Metallurg, Vol. 64, No. 9, pp. 93–100, September, 2020.

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Kochetkov, A.S., Panin, P.V., Nochovnaya, N.A. et al. Study of Chemical Inhomogeneity in Beta-Solidifying TiAl Alloys of Various Composition. Metallurgist 64, 962–973 (2021). https://doi.org/10.1007/s11015-021-01077-1

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  • DOI: https://doi.org/10.1007/s11015-021-01077-1

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