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擠壓態7075鋁合金再結晶經驗模型及應用
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-08-19
通過等溫壓縮試驗和定量金相分析研究擠壓態7075鋁合金在變形溫度為250~450℃、應變速率0.01~10 s-1下的變形行為和組織演化規律，得到不同變形條件下的真應力—應變曲線、平均晶粒尺寸、再結晶晶粒尺寸及再結晶分數。基于Yada模型通過統計回歸建立擠壓態7075鋁合金動態再結晶經驗模型并進行驗證。
擠壓態7075鋁合金再結晶經驗模型及應用Empirical recrystallization model and its application of
as-extruded aluminum alloy 7075
通過等溫壓縮試驗和定量金相分析研究擠壓態7075鋁合金在變形溫度為250~450℃、應變速率0.01~10
s-1下的變形行為和組織演化規律，得到不同變形條件下的真應力—應變曲線、平均晶粒尺寸、再結晶晶粒尺寸及再結晶分數。基于Yada模型通過統計回歸建立擠壓態7075鋁合金動態再結晶經驗模型并進行驗證。結果表明：所建立的Yada再結晶模型誤差平均值達到5%；通過二次開發實現了再結晶模型與Deform-3D軟件的結合，并進行單向墩粗模擬驗證，結果表明該模型預報精度較好。采用所建立的Yada再結晶模型研究7075鋁合金三通件多向加載成形過程組織演化，獲得加載路徑對工件晶粒尺寸特征的影響規律。
Using isothermal compression test and quantitative
metallographic analysis, the deformation behavior and microstructure evolution
of as-extruded aluminum alloy 7075 were studied within a temperature range of
250-450 ℃ and a strain rate range of 0.01-10s-1. The true
stress—strain curves, average grain size, recrystallized grain size,
recrystallization volume fraction under different deformation conditions were
obtained. Based on Yada recrystallization model, an empirical dynamic
recrystallization model of the as-extruded aluminum alloy 7075 was established
by means of statistical regression method. The results show that the average
error of the model is less than 5%. Through secondary development, the
established recrystallization model was implanted in the software Derform-3D,
simulation validation shows that the prediction accuracy of the model can meet
the requirements. Then, adopting the established model, the microstructure
evolution in multi-way loading forging process of the as extruded 7075 triple
valve workpiece was studied, and the grain size and distribution laws of the
workpiece under the two loading paths were obtained.
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