A parameterization method of recovery behavior based on initial yield stress – pre-strain diagram for an Al-Si-Cu high pressure die-casting alloy

Yuichi Motoyama, Gota Saito, Hiromi Ono, Makoto Yoshida

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Consideration of recovery behavior in the constitutive equation of alloy is crucially important for accurate thermal stress analysis of the casting process. However, previously reported empirical equations present difficulties when including a coefficient that determines the ratio of the recovery (or strain-hardening) strain component because the alloy recovery behavior has not been investigated systematically. First, this study systematically revealed effects of the temperature and amount of inelastic strain at 200–440 °C on the increase of the initial yield stress of the room temperature (RT) in an Al-Si-Cu high-pressure die casting alloy. Secondly, from those results, an initial yield stress – pre-strain diagram was proposed, demonstrating the effect of the amount of the inelastic strain given at each temperature on the increase of the initial yield stress of RT. Finally, this study newly defined a temperature-dependent contribution ratio of strain hardening to parameterize and duplicate the alloy recovery behavior based on the initial yield stress – pre-strain diagram for the constitutive equation of the alloy. Using this ratio as the coefficient to determine the proportion of the strain contributing the strain hardening for the constitutive equation, thermal stress analysis can produce more accurate duplication of the experimentally determined recovery behavior. Thereby, the residual stress and deformation of the component in the casting process can be predicted more accurately than when using conventional empirical constitutive equations.

    Original languageEnglish
    Pages (from-to)660-667
    Number of pages8
    JournalMaterials Science and Engineering A
    Volume684
    DOIs
    Publication statusPublished - 2017 Jan 27

    Fingerprint

    Die casting
    Parameterization
    parameterization
    Yield stress
    constitutive equations
    recovery
    diagrams
    strain hardening
    Constitutive equations
    Recovery
    Strain hardening
    stress analysis
    thermal stresses
    Stress analysis
    Thermal stress
    Casting
    Temperature
    room temperature
    coefficients
    residual stress

    Keywords

    • Aluminum alloys
    • Constitutive equation
    • Die-casting
    • Recovery behavior
    • Strain-hardening behavior

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    A parameterization method of recovery behavior based on initial yield stress – pre-strain diagram for an Al-Si-Cu high pressure die-casting alloy. / Motoyama, Yuichi; Saito, Gota; Ono, Hiromi; Yoshida, Makoto.

    In: Materials Science and Engineering A, Vol. 684, 27.01.2017, p. 660-667.

    Research output: Contribution to journalArticle

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