2219-T8铝合金搅拌摩擦沉积增材初始进料阶段数值模拟研究
Numerical simulation of the initial feed stage in additive friction stir deposition for AA2219-T8
杨天豪 1王诺 2郭维诚 2戴园城2
作者信息
- 1. 哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江 哈尔滨 150001;上海航天设备制造总厂有限公司,上海 200240
- 2. 上海理工大学,上海 200093
- 折叠
摘要
研究了高强铝合金 2219-T8 在搅拌摩擦沉积过程中初始进料阶段的温度、应变和塑性流动,并深入探讨了主轴转速和进料速度对材料流动性的影响规律.采用Arrhenius材料定律建立了三维有限元热力学模型.实验结果表明,在不同的工艺参数下,同一区域的沉积时间存在差异.在当前工艺参数设定下,主轴转速为 350 r/min,进料速度为 0.2 mm/s时,沉积速度最快,增材效率最高;随着主轴转速的增加,进料杆的升温速率增大,材料发生塑性变形的最高温度增加,应变速率也增大;随着进料速度的增加,材料流动性减弱,填补中空旋转工具与基板之间的间隙所需时间增加.
Abstract
The study investigated the temperature,strain,and plastic flow of high-strength aluminum alloy 2219-T8 during the initial feed stage of the additive friction stir deposition process.The influence of spindle rotational speed and material feed rate on material flow was thoroughly discussed.A three-dimensional finite element thermodynamic model was established using Arrhenius'material law.The experimental results indicate that there is a variation in deposition time within the same region under different process parameters.The optimal process parameter settings for achieving the fastest deposition speed and highest material enhancement efficiency are a spindle speed of 350 r/min and a feed rate of 0.2 mm/s.Increasing the spindle speed results in a higher heating rate of the feed rod,which in turn increases the highest temperature at which the material undergoes plastic deformation and the strain rate.On the other hand,increasing the material feed rate decreases the material mobility,which increases the time required to fill the gap between the stirring shaft and the substrate.
关键词
搅拌摩擦沉积增材/数值模拟/温度场/等效塑性应变Key words
additive friction stir deposition/numerical simulation/temperature fields/equivalent plastic strain引用本文复制引用
基金项目
全国重点实验室开放基金(MSV202312)
国防科技重点实验室项目(6142909220208)
出版年
2024
NETL
NSTL
万方数据