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Phase transformations in Ti-6Al-4V-xH alloys

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Abstract

Microstructures, phases, and phase transformations in Ti-6Al-4V alloy specimens containing 0, 10, 20, and 30 at. pct hydrogen were investigated using optical microscopy (OM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and microhardness testing. Alloying with hydrogen was achieved by holding the specimens in a pure hydrogen atmosphere of different pressures at 780 °C for 24 hours. The phases present in the temperature range of 20 °C to 1000 °C were determined by microstructural characterization of the specimens quenched from different temperatures. Increasing the hydrogen addition from 0 to 30 at. pct lowered the beta-transus temperature of the alloy from 1005 °C to 815 °C, significantly slowed down the kinetics of the beta-to-alpha transformation, and led to formation of an orthorhombic martensite instead of the hexagonal martensite found in quenched specimens containing 0 pct H. A hydride phase was detected in specimens containing 20 and 30 at. pct hydrogen. The time-temperature-transformation (TTT) diagrams for beta-phase decomposition were determined at different hydrogen concentrations. The nose temperature for the beginning of the transformation decreased from 725 °C to 580 °C, and the nose time increased from 12 seconds to 42 minutes when the hydrogen concentration was increased from 0 to 30 at. pct.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, the University of Idaho, 83844-3026, Moscow, ID

    J. I. Qazi (Postdoctoral Candidate) & J. Rahim (Master’s Student)

  2. Institute for Materials and Advanced Processes, the University of Idaho, 83844-3026, Moscow, ID

    F. H. (SAM) Fores (Director, Chair)

  3. Department of Materials, Metallurgical, Mining and Geological Engineering, the University of Idaho, 83844-3026, Moscow, ID

    F. H. (SAM) Fores (Director, Chair)

  4. UES, Inc., 45432-1894, Dayton, OH

    O. N. Senkov (Senior Scientist)

  5. the Metallurgical Engineering Department, Istanbul Technical University, 80626, Maslak-Istanbul, Turkey

    A. Genc (Postdoctoral Student)

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  1. J. I. Qazi
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  2. J. Rahim
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  3. F. H. (SAM) Fores
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  4. O. N. Senkov
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  5. A. Genc
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Qazi, J.I., Rahim, J., (SAM) Fores, F.H. et al. Phase transformations in Ti-6Al-4V-xH alloys. Metall Mater Trans A 32, 2453–2463 (2001). https://doi.org/10.1007/s11661-001-0035-8

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  • DOI: https://doi.org/10.1007/s11661-001-0035-8

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