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挤压态7075铝合金再结晶经验模型及应用
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-19
通过等温压缩试验和定量金相分析研究挤压态7075铝合金在变形温度为250~450℃、应变速率0.01~10 s-1下的变形行为和组织演化规律，得到不同变形条件下的真应力—应变曲线、平均晶粒尺寸、再结晶晶粒尺寸及再结晶分数。基于Yada模型通过统计回归建立挤压态7075铝合金动态再结晶经验模型并进行验证。
挤压态7075铝合金再结晶经验模型及应用Empirical recrystallization model and its application of
as-extruded aluminum alloy 7075
通过等温压缩试验和定量金相分析研究挤压态7075铝合金在变形温度为250~450℃、应变速率0.01~10
s-1下的变形行为和组织演化规律，得到不同变形条件下的真应力—应变曲线、平均晶粒尺寸、再结晶晶粒尺寸及再结晶分数。基于Yada模型通过统计回归建立挤压态7075铝合金动态再结晶经验模型并进行验证。结果表明：所建立的Yada再结晶模型误差平均值达到5%；通过二次开发实现了再结晶模型与Deform-3D软件的结合，并进行单向墩粗模拟验证，结果表明该模型预报精度较好。采用所建立的Yada再结晶模型研究7075铝合金三通件多向加载成形过程组织演化，获得加载路径对工件晶粒尺寸特征的影响规律。
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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