7075铝合金切削加工晶粒尺寸演化过程研究
Study on Grain Size Evolution Mechanism of 7075 Aluminum Alloy during Machining
郑广花 1刘孟阳 1张嘉慧 1黄留洋 1付宏鸽1
作者信息
- 1. 北华航天工业学院,河北廊坊 065000
- 折叠
摘要
金属材料在切削加工过程中,表层晶粒在机械载荷和热载荷的剧烈冲击作用下快速再结晶使表面形成晶粒细化层,该细化层严重影响材料使役性能.在研究切削加工晶粒尺寸演化机制的基础上,通过DEFORM仿真软件实现7075铝合金晶粒尺寸演化过程,开展单因素法试验,构建了晶粒尺寸关于切削速度、进给量的预测模型.结果表明:切削速度增加,表层晶粒尺寸增大,细化层厚度减小;进给量增加,晶粒尺寸和细化层厚度在温度和塑性变形共同作用下先增加后减小.通过实验验证,该模型能够较为准确地预测材料表面晶粒尺寸.
Abstract
During the cutting process of metal materials,the surface grains rapidly recrystallize under the severe impact of mechanical and thermal loads,forming a grain refinement layer on the surface,which seriously affects the material's service performance.On the basis of studying the evolution mechanism of grain size in cutting machining,this article uses DEFORM simulation software to achieve the evolution process of grain size in 7075 aluminum alloy,conducts single factor method ex-periments,and constructs a prediction model of grain size regarding cutting speed and feed rate.The results show that as the cutting speed increases,the surface grain size increases,and the thickness of the refined layer decreases;as the feed rate in-creases,the grain size and refined layer thickness first increase and then decrease under the combined effect of temperature and plastic deformation;experimental verification shows that the model accurately predicts the surface grain size of materials.
关键词
7075铝合金/晶粒尺寸/细化层/DEFORMKey words
7075 aluminum alloy/grain size/refinement layer/DEFORM引用本文复制引用
出版年
2024
NETL
NSTL
万方数据