The effect of thermomechanical processing on the creep behavior of Alloy 690

    Research output: Contribution to journalArticle

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    Abstract

    The effect of thermomechanical processing on the microstructure and elevated-temperature creep behavior of Alloy 690 was investigated. Commercially available sheet was subjected to four cycles of cold rolling to 25% deformation followed by annealing at 1000 °C for 1 h. Both the resultant microstructure and the original microstructure were characterized using electron backscattered diffraction. The thermomechanically processed microstructure exhibited a slightly lower fraction of twins and a smaller average grain size than the original microstructure. Tensile-creep experiments were performed in an open-air environment at temperatures between 650 and 690 °C and stresses between 75 and 172 MPa. The measured creep stress exponents (4-5) activation energies (320-368 kJ/mol) suggested that dislocation creep with lattice self-diffusion was dominant. The thermomechanically processed microstructure exhibited significantly worse creep resistance than the original as-processed microstructure. Thus, cyclic strain and annealing processing, which has been shown to improve the ductility-dip cracking susceptibility of Alloy 690, is not recommended for enhancing the creep resistance.

    Original languageEnglish (US)
    Pages (from-to)233-237
    Number of pages5
    JournalMaterials Science and Engineering A
    Volume473
    Issue number1-2
    DOIs
    StatePublished - Jan 25 2008

    Profile

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    Keywords

    • Creep
    • Electron backscattered diffraction
    • Microstructure
    • Nickel-based alloy

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    The effect of thermomechanical processing on the creep behavior of Alloy 690. / Boehlert, C. J.

    In: Materials Science and Engineering A, Vol. 473, No. 1-2, 25.01.2008, p. 233-237.

    Research output: Contribution to journalArticle

    Boehlert, C. J. / The effect of thermomechanical processing on the creep behavior of Alloy 690.

    In: Materials Science and Engineering A, Vol. 473, No. 1-2, 25.01.2008, p. 233-237.

    Research output: Contribution to journalArticle

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    abstract = "The effect of thermomechanical processing on the microstructure and elevated-temperature creep behavior of Alloy 690 was investigated. Commercially available sheet was subjected to four cycles of cold rolling to 25% deformation followed by annealing at 1000 °C for 1 h. Both the resultant microstructure and the original microstructure were characterized using electron backscattered diffraction. The thermomechanically processed microstructure exhibited a slightly lower fraction of twins and a smaller average grain size than the original microstructure. Tensile-creep experiments were performed in an open-air environment at temperatures between 650 and 690 °C and stresses between 75 and 172 MPa. The measured creep stress exponents (4-5) activation energies (320-368 kJ/mol) suggested that dislocation creep with lattice self-diffusion was dominant. The thermomechanically processed microstructure exhibited significantly worse creep resistance than the original as-processed microstructure. Thus, cyclic strain and annealing processing, which has been shown to improve the ductility-dip cracking susceptibility of Alloy 690, is not recommended for enhancing the creep resistance.",
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