Purpose

Accurate prediction of residual stress requires precise knowledge of the constitutive behavior of as-quenched material. This study aims to model the flow stress behavior for as-quenched Al-Mg-Si alloy.

Design Methodology Approach

In the present work, the flow behavior of as-quenched Al-Mg-Si alloy is studied by the hot compression tests at various temperatures (573–723 K), strain rates (0.1–1 s⁻¹) and cooling rates (1–10 K/s). Flow stress behavior is then experimentally observed, and an Arrhenius model is used to predict the flow behavior. However, due to the fact that materials parameters and activation energy do not remain constant, the Arrhenius model has an unsatisfied prediction for the flow behavior. Considering the effects of temperatures, strain rates and cooling rates on constitutive behavior, a revised Arrhenius model is developed to describe the flow stress behavior.

Findings

The experimental results show that the flow stress increases by the increasing cooling rate, increasing strain state and decreasing temperature. In comparison to the experimental data, the revised Arrhenius model has an excellent prediction for as-quenched Al-Mg-Si alloy.

Originality Value

With the revised Arrhenius model, the flow behaviors at different quenching conditions can be obtained, which is an essential step to the residual stress prediction when the model is implemented in a finite element code, e.g. ABAQUS, in the future.

中文翻译：

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考虑冷却速率影响的淬火态Al-Mg-Si合金的修正Arrhenius模型

目的

残余应力的准确预测需要对淬火材料的本构行为有准确的了解。本研究旨在模拟淬火态 Al-Mg-Si 合金的流动应力行为。

设计方法论

在目前的工作中，通过在不同温度 (573–723 K)、应变速率 (0.1–1 s ^-1 ) 和冷却速率 (1 –10 K/s）。然后通过实验观察流动应力行为，并使用 Arrhenius 模型来预测流动行为。然而，由于材料参数和活化能不保持恒定，Arrhenius 模型对流动行为的预测不令人满意。考虑到温度、应变速率和冷却速率对本构行为的影响，开发了一个修正的 Arrhenius 模型来描述流动应力行为。

发现

实验结果表明，流变应力随着冷却速度的增加、应变状态的增加和温度的降低而增加。与实验数据相比，修正后的 Arrhenius 模型对淬火态的 Al-Mg-Si 合金有很好的预测。

原创价值

通过修正后的Arrhenius模型，可以获得不同淬火条件下的流动行为，这对于未来将该模型在ABAQUS等有限元程序中实现残余应力预测是必不可少的一步。