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首页> 外文期刊>Journal of engineering materials and technology >A Modified Constitutive Model With Grain Rotation for Superplastic Forming of Ti-6AI-4V Alloy
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A Modified Constitutive Model With Grain Rotation for Superplastic Forming of Ti-6AI-4V Alloy

机译：Ti-6Al-4V合金超塑性成形的晶粒旋转修正本构模型

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摘要

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 σ_(fd), σ_(ta), and σ_(GB), 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.
机译：建立了具有内部状态变量（ISV）的基于物理的本构模型，该模型用于描述超塑性成形（SPF）中Ti-6Al-4V合金的流变应力和组织演变。本构模型中的ISV包括位错密度，晶粒尺寸和动态再结晶的体积分数。流应力由σ_（fd），σ_（ta）和σ_（GB）组成，分别与森林错位，热活化和晶界滑动（GBS）有关。确定本构模型的材料常数，并进行遗传算法（GA）优化。基于预测的和实验的流应力之间的误差，建立了优化流应力模型的建模方法路径。在改进的流动应力本构模型中，将晶粒旋转（GR）用作硬化机制，而将空隙视为软化机制。提出了一种新的GR模型来描述与GR相关的流应力。改进的本构模型可以准确预测SPF中的屈服应力，晶粒尺寸和流动应力的演变。利用多尺度本构模型的计算结果，讨论了SPF中Ti-6Al-4V的机理，并获得了具有主导机理的新的Ti-6Al-4V变形图。

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