Effect of creep and cyclic loading on pulsating fatigue behavior for various ti alloys under stress ratio R = 0

Gen Ichiro Nagatani, Rumi Kitazawa, Makoto Yoshida, Susumu Horibe

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    It is well known that creep at room temperature remarkably occurs in alpha-Ti alloys. Cyclic creep also appears. Moreover, Ti alloys have different crystal structures and various mechanical properties. Although the cyclic creep behavior and the cyclic softening behavior have been studied, integrated effect of them on fatigue life has not been clarified yet. In this study, fatigue behavior under stress ratio R=0, on Ti alloys of three crystal structures, is investigated. Influence of the cyclic creep and fatigue damage, and influence of the crystal structure to fatigue life are examined. As the results, it is found that as to the alpha-Ti, creep is the dominant damage factor. On the other hand, as to the beta-Ti alloy, fatigue is the dominant damage factor. As to the alpha + beta-Ti alloy, both creep and fatigue are the dominant damage factors (intermediate type). Furthermore, it is found that the area ratio and grain diameter of alpha phase, the spacing between different phases, should influence on cyclic creep strain rate.

    Original languageEnglish
    Pages (from-to)455-460
    Number of pages6
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume77
    Issue number10
    DOIs
    Publication statusPublished - 2013 Oct

    Fingerprint

    stress ratio
    Creep
    Fatigue of materials
    damage
    fatigue life
    crystal structure
    Crystal structure
    softening
    strain rate
    Fatigue damage
    spacing
    mechanical properties
    Strain rate
    room temperature
    Mechanical properties

    Keywords

    • Creep
    • Crystal structure
    • Fatigue
    • Titanium alloy

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Materials Chemistry
    • Metals and Alloys
    • Condensed Matter Physics

    Cite this

    Effect of creep and cyclic loading on pulsating fatigue behavior for various ti alloys under stress ratio R = 0. / Nagatani, Gen Ichiro; Kitazawa, Rumi; Yoshida, Makoto; Horibe, Susumu.

    In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 77, No. 10, 10.2013, p. 455-460.

    Research output: Contribution to journalArticle

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    AU - Kitazawa, Rumi

    AU - Yoshida, Makoto

    AU - Horibe, Susumu

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    AB - It is well known that creep at room temperature remarkably occurs in alpha-Ti alloys. Cyclic creep also appears. Moreover, Ti alloys have different crystal structures and various mechanical properties. Although the cyclic creep behavior and the cyclic softening behavior have been studied, integrated effect of them on fatigue life has not been clarified yet. In this study, fatigue behavior under stress ratio R=0, on Ti alloys of three crystal structures, is investigated. Influence of the cyclic creep and fatigue damage, and influence of the crystal structure to fatigue life are examined. As the results, it is found that as to the alpha-Ti, creep is the dominant damage factor. On the other hand, as to the beta-Ti alloy, fatigue is the dominant damage factor. As to the alpha + beta-Ti alloy, both creep and fatigue are the dominant damage factors (intermediate type). Furthermore, it is found that the area ratio and grain diameter of alpha phase, the spacing between different phases, should influence on cyclic creep strain rate.

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