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    A Modified Constitutive Model With Grain Rotation for Superplastic Forming of Ti–6Al–4V Alloy

    Source: Journal of Engineering Materials and Technology:;2020:;volume( 142 ):;issue: 002::page 021006-1
    Author:
    Yang, Junzhou
    ,
    Wu, Jianjun
    ,
    Yang, Dongshen
    ,
    Wang, Qishuai
    ,
    Wang, Kaiwei
    ,
    Zhang, Zengkun
    ,
    Wang, Mingzhi
    ,
    Muzamil, Muhammad
    DOI: 10.1115/1.4045364
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A physically based constitutive model with internal state variables (ISVs) is established, it is used to describe the flow stress and microstructure evolution of Ti–6Al–4V alloy in the superplastic forming (SPF). The ISVs in the constitutive model includes the dislocation density, grain size, and the volume fraction of dynamic recrystallization. The flow stress consists of σfd, σta, and σGB, which are related to forest dislocation, thermal activation, and grain boundary sliding (GBS), respectively. The material constants of the constitutive model are determined, and the genetic algorithm (GA) optimization. A modeling method path to optimize the flow stress model is established, which is on the basis of the errors between the predicted and experimental flow stresses. In the modified flow stress constitutive model, the grain rotation (GR) is applied as a hardening mechanism, and the void is treated as a softening mechanism. A new GR model is proposed to describe the flow stress which is related to the GR. The modified constitutive model can accurately predict the evolution of yield stress, grain size and flow stress in SPF. With the calculation results of the multi-scales constitutive model, the mechanism of Ti–6Al–4V in SPF is discussed, and a new deformation map with dominant mechanisms for Ti–6Al–4V is obtained.
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      A Modified Constitutive Model With Grain Rotation for Superplastic Forming of Ti–6Al–4V Alloy

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4275711
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    contributor authorYang, Junzhou
    contributor authorWu, Jianjun
    contributor authorYang, Dongshen
    contributor authorWang, Qishuai
    contributor authorWang, Kaiwei
    contributor authorZhang, Zengkun
    contributor authorWang, Mingzhi
    contributor authorMuzamil, Muhammad
    date accessioned2022-02-04T22:55:21Z
    date available2022-02-04T22:55:21Z
    date copyright4/1/2020 12:00:00 AM
    date issued2020
    identifier issn0094-4289
    identifier othermats_142_2_021006.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4275711
    description abstractA physically based constitutive model with internal state variables (ISVs) is established, it is used to describe the flow stress and microstructure evolution of Ti–6Al–4V alloy in the superplastic forming (SPF). The ISVs in the constitutive model includes the dislocation density, grain size, and the volume fraction of dynamic recrystallization. The flow stress consists of σfd, σta, and σGB, which are related to forest dislocation, thermal activation, and grain boundary sliding (GBS), respectively. The material constants of the constitutive model are determined, and the genetic algorithm (GA) optimization. A modeling method path to optimize the flow stress model is established, which is on the basis of the errors between the predicted and experimental flow stresses. In the modified flow stress constitutive model, the grain rotation (GR) is applied as a hardening mechanism, and the void is treated as a softening mechanism. A new GR model is proposed to describe the flow stress which is related to the GR. The modified constitutive model can accurately predict the evolution of yield stress, grain size and flow stress in SPF. With the calculation results of the multi-scales constitutive model, the mechanism of Ti–6Al–4V in SPF is discussed, and a new deformation map with dominant mechanisms for Ti–6Al–4V is obtained.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Modified Constitutive Model With Grain Rotation for Superplastic Forming of Ti–6Al–4V Alloy
    typeJournal Paper
    journal volume142
    journal issue2
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.4045364
    journal fristpage021006-1
    journal lastpage021006-13
    page13
    treeJournal of Engineering Materials and Technology:;2020:;volume( 142 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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