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    A Study of Inhomogeneous Plastic Deformation of 1045 Steel

    Source: Journal of Engineering Materials and Technology:;2004:;volume( 126 ):;issue: 002::page 164
    Author:
    Jixi Zhang
    ,
    Yanyao Jiang
    DOI: 10.1115/1.1647125
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: An experimental study was conducted on the inhomogeneous plastic deformation of 1045 steel subjected to monotonic tension and cyclic tension-compression. Small strain gages were used to characterize the local deformation and transmission electron microscopy (TEM) was used to study the microstructures associated with the observed deformation phenomenon. Under monotonic tension, the strain of the Lüders front was lower than the full Lüders strain. The local strains were inhomogeneous even at the work-hardening stage. Under stress-controlled cyclic loading with stress amplitudes below the lower yield stress, cyclic deformation consisted of an incubation stage, a significantly inhomogeneous cyclic softening stage, and a saturation stage. Inhomogeneous cyclic plasticity persisted at the saturation stage. A monotonic tension preload can eliminate the incubation stage in the subsequent cyclic loading. Under asymmetric cyclic loading with a mean stress, the cyclic plastic deformation was accompanied by noticeable inhomogeneous ratcheting deformation. TEM was used to analyze the distribution and evolution of the dislocation structures at different locations of the specimen. With increasing loading cycles, the dislocation substructures evolved in a sequence of loose tangles, thick veins, long walls, elongated cells, and equiaxial cells. Based upon the mechanical experiments and observations of dislocation arrangements, the mechanisms governing inhomogeneous cyclic plastic deformation were discussed.
    keyword(s): Deformation , Steel , Stress , Dislocations , Cycles , Tension , Strain gages , Gages AND Yield stress ,
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      A Study of Inhomogeneous Plastic Deformation of 1045 Steel

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    http://yetl.yabesh.ir/yetl1/handle/yetl/130123
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    contributor authorJixi Zhang
    contributor authorYanyao Jiang
    date accessioned2017-05-09T00:13:11Z
    date available2017-05-09T00:13:11Z
    date copyrightApril, 2004
    date issued2004
    identifier issn0094-4289
    identifier otherJEMTA8-27057#164_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/130123
    description abstractAn experimental study was conducted on the inhomogeneous plastic deformation of 1045 steel subjected to monotonic tension and cyclic tension-compression. Small strain gages were used to characterize the local deformation and transmission electron microscopy (TEM) was used to study the microstructures associated with the observed deformation phenomenon. Under monotonic tension, the strain of the Lüders front was lower than the full Lüders strain. The local strains were inhomogeneous even at the work-hardening stage. Under stress-controlled cyclic loading with stress amplitudes below the lower yield stress, cyclic deformation consisted of an incubation stage, a significantly inhomogeneous cyclic softening stage, and a saturation stage. Inhomogeneous cyclic plasticity persisted at the saturation stage. A monotonic tension preload can eliminate the incubation stage in the subsequent cyclic loading. Under asymmetric cyclic loading with a mean stress, the cyclic plastic deformation was accompanied by noticeable inhomogeneous ratcheting deformation. TEM was used to analyze the distribution and evolution of the dislocation structures at different locations of the specimen. With increasing loading cycles, the dislocation substructures evolved in a sequence of loose tangles, thick veins, long walls, elongated cells, and equiaxial cells. Based upon the mechanical experiments and observations of dislocation arrangements, the mechanisms governing inhomogeneous cyclic plastic deformation were discussed.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Study of Inhomogeneous Plastic Deformation of 1045 Steel
    typeJournal Paper
    journal volume126
    journal issue2
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.1647125
    journal fristpage164
    journal lastpage171
    identifier eissn1528-8889
    keywordsDeformation
    keywordsSteel
    keywordsStress
    keywordsDislocations
    keywordsCycles
    keywordsTension
    keywordsStrain gages
    keywordsGages AND Yield stress
    treeJournal of Engineering Materials and Technology:;2004:;volume( 126 ):;issue: 002
    contenttypeFulltext
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