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Gleeble-Assisted Investigation and Thermokinetics Simulation of α Phase Isothermal Precipitation during Short-Time Duplex Heat Treatment of Ti-6Al-4V Alloy

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Abstract

The precipitation mechanism and kinetics of the secondary α phase during short-time duplex heat treatment of the Ti-6Al-4V alloy were investigated. The precipitation kinetics was determined by means of in situ isothermal electrical resistivity tests in a Gleeble thermomechanical testing machine in the temperature range of 600-700 °C. The results showed that the higher the aging temperature, the faster the secondary α phase precipitation, which obeys the Kolmogorov–Johnson–Mehl–Avrami (KJMA) equation with an Avrami parameter n = 1. The precipitation process was also investigated by simulation using the thermokinetic software MatCalc. Results of the simulation on MatCalc indicated that the secondary α phase nucleation ended at an earlier stage of the precipitation and that the latter is mainly controlled by the growth of secondary α phase precipitates. Increasing the aging temperature resulted in an increase of the precipitate’s size with an activation energy of Q = 62 kJ/mol for the process. Evolution of the simulated elements contents showed that only the vanadium concentration in the β phase changed significantly during the isothermal aging. Thus, the growth of the secondary α phase is governed by the vanadium diffusion into the β phase.

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Acknowledgments

This work was supported by a Doctorate fund of the Ministry of Higher Education and Scientific Research of Algeria and was a part of a research project at the Research Center in Industrial Technologies (CRTI). Dr. E. Povoden-Karadeniz (Vienna University of Technology) is gratefully acknowledged for graciously making available the thermodynamic and diffusion databases of the Ti-Al-V system for the MatCalc simulation. The Gleeble 3500 machine of Université de Bretagne-Sud was co-funded by the European Regional Development Fund. The authors would like to thank Mr. W. Berckmans (Univ. Bretagne-Sud) for the efforts he has put into completing the Gleeble tests.

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Authors and Affiliations

  1. Research Center in Industrial Technologies CRTI, P.O. BOX 64, 16014, Cheraga, Algiers, Algeria

    Nabil Kherrouba & Riad Badji

  2. IRDL, UMR CNRS 6027, Univ. Bretagne Sud, 56100, Lorient, France

    Denis Carron

  3. Laboratoire de Technologie des Matériaux, Département SDM, Faculté de Génie Mécanique et Génie des Procédés, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria

    Ramdhane Kouba

  4. LGSDS – Ecole Nationale Polytechnique, 10 Avenue Hassan Badi, 16200, El Harrach, Algiers, Algeria

    Mabrouk Bouabdallah

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Kherrouba, N., Carron, D., Kouba, R. et al. Gleeble-Assisted Investigation and Thermokinetics Simulation of α Phase Isothermal Precipitation during Short-Time Duplex Heat Treatment of Ti-6Al-4V Alloy. J. of Materi Eng and Perform 31, 7517–7526 (2022). https://doi.org/10.1007/s11665-022-06775-8

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