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首页> 外文期刊>Journal of Materials Engineering and Performance >Impact of Selective Grain Refinement on Superplastic Deformation: Finite Element Analysis
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Impact of Selective Grain Refinement on Superplastic Deformation: Finite Element Analysis

机译：选择性细化晶粒对超塑性变形的影响：有限元分析

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Recently, Friction Stir Processing has been introduced as an effective tool to refine the grain structure of sheet metals and enhance their superplasticity. A possible application of friction stir processing is selective grain refinement to enhance deformation uniformity and minimize localized thinning. This selective treatment will result in a sheet with grain size gradient. Very limited studies have been directed toward investigating the effect of grain size gradient on the superplastic deformation during SPF. In this work, Finite Element simulations for the free bulging of a dome made of 7075A1 alloy were conducted to examine the effects of initial grain size gradient within the sheet on SPF characteristics. The results clearly demonstrate that selective grain refinement can be utilized to eliminate severe thinning and improve the integrity of the superplastic formed part.
机译：最近，摩擦搅拌处理已被引入为一种有效的工具，可以改善钣金的晶粒结构并增强其超塑性。摩擦搅拌工艺的可能应用是选择性晶粒细化，以增强变形均匀性并最大程度地减少局部变薄。这种选择性处理将导致片材具有晶粒尺寸梯度。研究SPF过程中晶粒梯度对超塑性变形的影响的研究非常有限。在这项工作中，进行了由7075A1合金制成的圆顶自由膨胀的有限元模拟，以检查板材中初始晶粒尺寸梯度对SPF特性的影响。结果清楚地表明，可以利用选择性晶粒细化来消除严重的变薄现象并改善超塑性成形零件的完整性。

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