The elevated-temperature fatigue behavior of boron-modified Ti-6Al-4V(wt.%) castings

    Research output: Research - peer-reviewArticle

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    Abstract

    This work investigated the effect of nominal boron additions of 0.1 and 1.0 wt.% on the elevated-temperature (455 °C) fatigue deformation behavior of Ti-6Al-4V(wt.%) castings for maximum applied stresses between 250 and 450 MPa (R = 0.1 and 5 Hz). Boron additions resulted in a dramatic refinement of the as-cast grain size, and larger boron additions resulted in larger titanium-boride (TiB) phase volume percents. The boron-containing alloys exhibited longer average fatigue lives than those for Ti-6Al-4V, which was suggested to be related to the reduced as-cast grain size and the addition of strong and stiff TiB phase. The Ti-6Al-4V-0.1B alloy exhibited the longest average fatigue lives. The TiB phase cracked during the fatigue experiments and this resulted in a decreasing Young's modulus with increased cycle number. Each alloy exhibited α-phase cracking and environmentally assisted surface edge cracking.

    LanguageEnglish (US)
    Pages132-138
    Number of pages7
    JournalMaterials Science and Engineering A
    Volume494
    Issue number1-2
    DOIs
    StatePublished - Oct 25 2008

    Profile

    Boron
    Fatigue of materials
    Temperature
    Castings
    boron
    temperature
    Borides
    Titanium
    titanium boride
    titanium borides
    fatigue life
    casts
    grain size
    Elastic moduli
    Experiments
    titanium alloy (TiAl6V4)
    boron alloys
    modulus of elasticity
    cycles

    Keywords

    • Boron
    • Fatigue
    • Microstructure
    • Titanium

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    The elevated-temperature fatigue behavior of boron-modified Ti-6Al-4V(wt.%) castings. / Chen, W.; Boehlert, C. J.

    In: Materials Science and Engineering A, Vol. 494, No. 1-2, 25.10.2008, p. 132-138.

    Research output: Research - peer-reviewArticle

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    N2 - This work investigated the effect of nominal boron additions of 0.1 and 1.0 wt.% on the elevated-temperature (455 °C) fatigue deformation behavior of Ti-6Al-4V(wt.%) castings for maximum applied stresses between 250 and 450 MPa (R = 0.1 and 5 Hz). Boron additions resulted in a dramatic refinement of the as-cast grain size, and larger boron additions resulted in larger titanium-boride (TiB) phase volume percents. The boron-containing alloys exhibited longer average fatigue lives than those for Ti-6Al-4V, which was suggested to be related to the reduced as-cast grain size and the addition of strong and stiff TiB phase. The Ti-6Al-4V-0.1B alloy exhibited the longest average fatigue lives. The TiB phase cracked during the fatigue experiments and this resulted in a decreasing Young's modulus with increased cycle number. Each alloy exhibited α-phase cracking and environmentally assisted surface edge cracking.

    AB - This work investigated the effect of nominal boron additions of 0.1 and 1.0 wt.% on the elevated-temperature (455 °C) fatigue deformation behavior of Ti-6Al-4V(wt.%) castings for maximum applied stresses between 250 and 450 MPa (R = 0.1 and 5 Hz). Boron additions resulted in a dramatic refinement of the as-cast grain size, and larger boron additions resulted in larger titanium-boride (TiB) phase volume percents. The boron-containing alloys exhibited longer average fatigue lives than those for Ti-6Al-4V, which was suggested to be related to the reduced as-cast grain size and the addition of strong and stiff TiB phase. The Ti-6Al-4V-0.1B alloy exhibited the longest average fatigue lives. The TiB phase cracked during the fatigue experiments and this resulted in a decreasing Young's modulus with increased cycle number. Each alloy exhibited α-phase cracking and environmentally assisted surface edge cracking.

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