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    Defect Occurrence and Modeling for the Thermomechanical Processing of Aerospace Alloys

    Source: Journal of Engineering Materials and Technology:;2008:;volume( 130 ):;issue: 002::page 21001
    Author:
    S. L. Semiatin
    ,
    P. D. Nicolaou
    ,
    J. P. Thomas
    ,
    T. J. Turner
    DOI: 10.1115/1.2840958
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Mechanism-based models for the evolution of defects during the thermomechanical processing of aerospace titanium- and nickel-based alloys are reviewed. These defects include those comprising microstructural/metal-flow irregularities and those that are damage related (i.e., cracks and cavities). The development of undesirable/nonuniform microstructures and cavities during the mill processing of alpha/beta titanium alloys is addressed first. Relatively simple, diffusion-based models of spheroidization and coarsening are applied to quantify the propensity for microstructure nonuniformities. Similarly, first-order micromechanical models have been formulated to estimate the effect of local crystallographic texture on nonuniform flow, the generation of triaxial stresses, and cavity growth/closure in alpha/beta titanium alloys with a colony-alpha microstructure. The occurrence of nonuniform grain structures (and so-called ALA, or “as large as,” grains) in cast, wrought, and powder-metallurgy superalloys is also discussed. A physics-based model to treat the topology of recrystallization and the evolution of ALA grains in such materials is proposed.
    keyword(s): Alloys , Product quality , Recrystallization , Titanium alloys , Stress , Aerospace industry , Cavities , Thermomechanical treatment , Superalloys , Diffusion (Physics) , Modeling , Cavitation AND Nickel ,
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      Defect Occurrence and Modeling for the Thermomechanical Processing of Aerospace Alloys

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    http://yetl.yabesh.ir/yetl1/handle/yetl/138080
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    contributor authorS. L. Semiatin
    contributor authorP. D. Nicolaou
    contributor authorJ. P. Thomas
    contributor authorT. J. Turner
    date accessioned2017-05-09T00:28:12Z
    date available2017-05-09T00:28:12Z
    date copyrightApril, 2008
    date issued2008
    identifier issn0094-4289
    identifier otherJEMTA8-27105#021001_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138080
    description abstractMechanism-based models for the evolution of defects during the thermomechanical processing of aerospace titanium- and nickel-based alloys are reviewed. These defects include those comprising microstructural/metal-flow irregularities and those that are damage related (i.e., cracks and cavities). The development of undesirable/nonuniform microstructures and cavities during the mill processing of alpha/beta titanium alloys is addressed first. Relatively simple, diffusion-based models of spheroidization and coarsening are applied to quantify the propensity for microstructure nonuniformities. Similarly, first-order micromechanical models have been formulated to estimate the effect of local crystallographic texture on nonuniform flow, the generation of triaxial stresses, and cavity growth/closure in alpha/beta titanium alloys with a colony-alpha microstructure. The occurrence of nonuniform grain structures (and so-called ALA, or “as large as,” grains) in cast, wrought, and powder-metallurgy superalloys is also discussed. A physics-based model to treat the topology of recrystallization and the evolution of ALA grains in such materials is proposed.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleDefect Occurrence and Modeling for the Thermomechanical Processing of Aerospace Alloys
    typeJournal Paper
    journal volume130
    journal issue2
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.2840958
    journal fristpage21001
    identifier eissn1528-8889
    keywordsAlloys
    keywordsProduct quality
    keywordsRecrystallization
    keywordsTitanium alloys
    keywordsStress
    keywordsAerospace industry
    keywordsCavities
    keywordsThermomechanical treatment
    keywordsSuperalloys
    keywordsDiffusion (Physics)
    keywordsModeling
    keywordsCavitation AND Nickel
    treeJournal of Engineering Materials and Technology:;2008:;volume( 130 ):;issue: 002
    contenttypeFulltext
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