Development of a methodology for microstructural and thermal verification of the quality of an industrial Ti-10V-2Fe-3Al triple vacuum arc remelted ingot

A.T. Mamutova; T.A. Chepushtanova; B. Mishra

doi:10.31643/2028/6445.08

Authors

A.T. Mamutova Ust-Kamenogorsk Titanium and Magnesium Plant JSC
T.A. Chepushtanova Satbayev University
B. Mishra Worcester Polytechnic Institute

DOI:

https://doi.org/10.31643/2028/6445.08

Keywords:

Ti-10V-2Fe-3Al triple-remelt alloy, vacuum arc melting, DSC–DTG and SEM–EDS analyses, α/β phase transformations, thermal decomposition analysis.

Abstract

The article is devoted to the development of a methodology for microstructural and thermal verification of the quality of an industrial Ti-10V-2Fe-3Al triple vacuum arc remelted ingot produced by UK TMP JSC. It was established that all zones of the ingot demonstrate a two-stage thermal evolution characteristic of the β-metastable Ti-10V-2Fe-3Al alloy: decomposition of the metastable β phase (≈520–570 °C) and an endothermic α→β phase transformation (≈950–1120 °C). It was found that the enthalpy of the exothermic decomposition of the β matrix increases by approximately 60–80% in the lower zone of the ingot. The width of the phase transition (ΔT) correlates with an increase in microsegregation. It was also determined that the enthalpy of the endothermic α→β transformation decreases from the bottom part of the ingot toward the steady-state crystallization zone (Middle-1), which correlates with a reduction in the microsegregation parameters obtained from SEM–EDS profiles (ΔC_max, σC, L_corr). Thus, thermal analysis confirms the absence of a pronounced vertical gradient of structural stability and can be used as a validating criterion for the integral electrode quality index. For the first time, a quantitative correlation between SEM–EDS profiles and DSC–DTG characteristics has been proposed. Thermal analysis is suggested as an independent validator of microsegregation. An approach to the quantitative evaluation of microsegregation based on SEM–EDS profiles using the parameters ΔC_max, σC, L_corr, and ΔCO_(local) has been developed. Additionally, the use of an integral chemical index I_chem, and a critical threshold I^crit_chem is proposed for electrode quality control using thermal analysis results.

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Author Biographies

A.T. Mamutova, Ust-Kamenogorsk Titanium and Magnesium Plant JSC

President of Titanium and Magnesium Plant JSC, Ust-Kamenogorsk; PhD student of the Mining and Metallurgical Institute, Satbayev University, Almaty, Kazakhstan.

T.A. Chepushtanova, Satbayev University

Candidate of Technical Sciences, PhD, Professor, Head of Laboratory ’Metallurgical processes, heat engineering and powder metallurgy, Mining and Metallurgical Institute, Satbayev University, Almaty, Kazakhstan.

B. Mishra, Worcester Polytechnic Institute

Professor and MPI Director of Mechanical and Materials Engineering, Worcester Polytechnic Institute, USA, Worcester.

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