热挤压温度对6061铝合金栅格形零件组织性能的影响
Effect of hot extrusion temperature on microstructure and properties of 6061 aluminum alloy grid-shaped parts
单强超 1钱成 1张庆彪 1李祖来 1肖寒1
作者信息
- 1. 昆明理工大学材料科学与工程学院,云南昆明 650093
- 折叠
摘要
以6061铝合金型材为研究对象,对其进行了不同热挤压温度的数值模拟,以确定其合适的热挤压温度,并在合适的热挤压温度下对其进行了热挤压成形;采用光学显微镜、扫描电镜、万能材料试验机以及硬度仪等研究了热挤压温度对6061铝合金栅格形零件组织性能的影响,并确定其最佳的热挤压温度.结果表明:随着热挤压温度的升高,栅格形6061铝合金型材先发生再结晶,后发生晶粒长大,且合金中第二相Mg2Si增多,合金的硬度总体呈上升趋势,抗拉强度先增加后略微减小.6061铝合金栅格形零件较佳的热挤压温度为460 ℃、挤压速度为6 mm/s,此时其抗拉强度为190.4 MPa,硬度为47.8 HV0.3、伸长率为 11.7％.
Abstract
Taking 6061 aluminum alloy profile as the research object,numerical simulations were conducted at different hot extrusion temperatures to determine its appropriate hot extrusion temperature,and hot extrusion forming was carried out at the appropriate hot extrusion temperature.The effect of hot extrusion temperature on microstructure and properties of 6061 aluminum alloy grid-shaped parts was studied by means of optical microscope,scanning electron microscopy,universal material testing machine and hardness tester,and the optimal hot extrusion temperature was determined.The results show that as the hot extrusion temperature increases,the grid-shaped 6061 aluminum alloy profile first undergoes recrystallization,followed by grain growth,the number of the second phase Mg2Si in the alloy increases,the hardness of the alloy generally shows an increasing trend,and the tensile strength first increases and then slightly decreases.The optimal hot extrusion temperature for the 6061 aluminum alloy grid-shaped parts is 460 ℃,extrusion speed is 6 mm/s,and its tensile strength is 190.4 MPa,hardness is 47.8 HV0.3,and elongation is 11.7％.
关键词
6061铝合金型材/热挤压/微观组织/抗拉强度/伸长率Key words
6061 aluminum alloy/hot extrusion/microstructure/tensile strength/elongation引用本文复制引用
基金项目
云南省重大科技专项计划资助项目(202202AG050011)
出版年
2024
NETL
NSTL
万方数据