大型环形件用2219铝合金的动态再结晶行为
Dynamic Recrystallization Behavior of 2219 Aluminum Alloy for Large-Scale Rings
摘 要
选用Gleeble-3500型热模拟试验机在变形温度330~450 ℃、应变速率10-2~10 s-1、压缩变形量60%条件下对2219铝合金进行热压缩试验，研究了其在热变形过程中的动态再结晶行为；通过对试验数据进行分析拟合，建立了以Z参数表示的热变形特征参数模型，基于改进Avrami方程的动态再结晶动力学模型以及以变形温度、应变速率表示的再结晶晶粒尺寸模型。结果表明：在低应变速率和高变形温度下，2219铝合金更易于发生动态再结晶；根据动态再结晶动力学模型，最佳热加工条件为应变速率0.1 s-1、温度360 ℃，此时2219铝合金的动态再结晶程度最高；动态再结晶晶粒尺寸模型预测精度较高，线性相关系数达0.95。
动态再结晶模型
热压缩
晶粒尺寸
2219 aluminum alloy
dynamic recrystallization model
thermal compression
grain size
Abstract
Hot compression tests were conducted on 2219 aluminum alloy at deformation temperatures of 330-450 ℃, strain rates of 10-2-10 s-1, and compression deformation of 60% on a Gleeble-3500 thermal simulation machine, and the dynamic recrystallization behavior during hot deformation was studied. Through analysis and fitting of the experimental data, the thermal deformation characteristic parameter model based on the Z parameter, the dynamic recrystallization kinetic model based on the improved Avrami equation, and the dynamic recrystallized grain size model based on deformation temperatures and strain rates were established. The results show that at a low strain rate and a high deformation temperature, 2219 aluminum alloy was more prone to dynamic recrystallization. According to the dynamic recrystallization kinetic model, the optimal hot working conditions were determined as a strain rate of 0.1 s-1 and a temperature of 360 ℃. Under this condition, the dynamic recrystallization degree of 2219 aluminum alloy was the highest. The prediction accuracy of the dynamic recrystallized grain size model was high, and the linear correlation coefficient reached 0.95.
中图分类号 V252.2 TG146.2 DOI 10.11973/jxgccl202108007
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（51405248）；浙江省自然科学基金资助项目（LY18E050006）；宁波市自然科学基金资助项目（2017A610088）；宁波市科技创新2025重大专项（2018B10004；2019B10100）
收稿日期 2020/9/7
修改稿日期 2021/7/14
网络出版日期
作者单位点击查看
备注邹杰(1996-),男,浙江湖州人,硕士研究生
引用该论文: ZOU Jie,PENG Wenfei,CHEN Zhenyang. Dynamic Recrystallization Behavior of 2219 Aluminum Alloy for Large-Scale Rings[J]. Materials for mechancial engineering, 2021, 45(8): 37～44
邹杰,彭文飞,陈镇扬. 大型环形件用2219铝合金的动态再结晶行为[J]. 机械工程材料, 2021, 45(8): 37～44
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