Structure of titanium alloy, modified by electron beams and destroyed during fatigue

S. V. Konovalov, I. A. Komissarova, D. A. Kosinov, Yu F. Ivanov, O. V. Ivanova, V. E. Gromov

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    The present work is aimed to study the fracture surface and state of the defect substructure after high-cycle fatigue failure of titanium alloy VT1–0 preliminarily subjected to an intense pulsed electron beam irradiation with an electron energy 16 keV, pulse rate 0.3 s -1 , pulse duration 150 μs, beam energy flux density 30 J/cm 2 and the number of pulses 3. Electron beam irradiation led to an enhancement of the fatigue life by 20% on average with respect to that of unirradiated samples. It has been established that the fatigue fracture has a multilayered character and is characterized by the presence of a surface layer of 20 to 25 μm thickness, an intermediate layer of 50-55 μm thickness and the bulk of the material. In the surface layer, a sublayer characterized by the presence of micropores adjacent to the irradiation surface can be distinguished. In order to compare with experimental results, the temperature field has been theoretically calculated. The analysis has shown that irradiation of titanium is accompanied by the formation of a relatively thin (about 25 μm) surface layer, which is formed as a result of rapid crystallization. It is shown that the defect substructure of the surface layer in samples failed by fatigue tests consists of a polycrystalline structure based on α-Ti; in the volume of grains, a dislocation substructure is observed, represented by randomly distributed dislocations or dislocations forming networks. It is established that the structure of samples irradiated by electron beam and failed by fatigue tests significantly differs from the structure revealed in unirradiated titanium samples by a subgrain structure in the volumes of grains in a surface layer with the thickness of 5 μm. On a larger distance from irradiated surface (about 20 to 25 μm), a plate-like substructure is observed in the grains. The state of plate-like structure essentially depends on a distance from the irradiated surface. Namely, a transition from a mixed subgrain and plate-like structure to the plate-like one occurs.

    Original languageEnglish
    Pages (from-to)266-271
    Number of pages6
    JournalLetters on Materials
    Volume7
    Issue number3
    DOIs
    Publication statusPublished - 1 Sep 2017

    Fingerprint

    Titanium alloys
    Electron beams
    Fatigue of materials
    Irradiation
    Titanium
    Defects
    Crystallization
    Temperature distribution
    Fluxes
    Electrons

    Keywords

    • Electron-beam treatment
    • High cycle fatigue
    • Structure
    • Titanium alloy VT1-0

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Konovalov, S. V., Komissarova, I. A., Kosinov, D. A., Ivanov, Y. F., Ivanova, O. V., & Gromov, V. E. (2017). Structure of titanium alloy, modified by electron beams and destroyed during fatigue. Letters on Materials, 7(3), 266-271. https://doi.org/10.22226/2410-3535-2017-3-266-271

    Structure of titanium alloy, modified by electron beams and destroyed during fatigue. / Konovalov, S. V.; Komissarova, I. A.; Kosinov, D. A.; Ivanov, Yu F.; Ivanova, O. V.; Gromov, V. E.

    In: Letters on Materials, Vol. 7, No. 3, 01.09.2017, p. 266-271.

    Research output: Contribution to journalArticle

    Konovalov, SV, Komissarova, IA, Kosinov, DA, Ivanov, YF, Ivanova, OV & Gromov, VE 2017, 'Structure of titanium alloy, modified by electron beams and destroyed during fatigue', Letters on Materials, vol. 7, no. 3, pp. 266-271. https://doi.org/10.22226/2410-3535-2017-3-266-271
    Konovalov, S. V. ; Komissarova, I. A. ; Kosinov, D. A. ; Ivanov, Yu F. ; Ivanova, O. V. ; Gromov, V. E. / Structure of titanium alloy, modified by electron beams and destroyed during fatigue. In: Letters on Materials. 2017 ; Vol. 7, No. 3. pp. 266-271.
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