高温长时退火后纯铜丝的组织与性能  

Microstructure and properties of pure copper wire after high temperature long time annealing

作　　者：肖秋雷 毛西秦 欧梅桂[2,3] 梁宇 陈德松[2,3] Xiao Qiulei;Mao Xiqin;Ou Meigui;Liang Yu;Chen Desong(Guizhou Guda Wire and Cable(Group)Co.,Ltd.,Anshun Guizhou 561000,China;School of Materials and Metallurgy,Guizhou University,Guiyang Guizhou 550025,China;National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology,Guiyang Guizhou 550025,China)

机构地区：[1]贵州固达电线电缆(集团)有限公司,贵州安顺561000 [2]贵州大学材料与冶金学院,贵州贵阳550025 [3]高性能金属结构材料与制造技术国家地方联合工程实验室,贵州贵阳550025

出　　处：《金属热处理》2021年第11期152-156,共5页Heat Treatment of Metals

基　　金：贵州省科学技术项目(黔科合支撑[2019]2165号);贵州省教育厅工程研究中心项目(黔教合KY字[2017]016)。

摘　　要：将Ф8 mm退火态T2纯铜棒材,通过工业拉丝机进行多道次冷拉拔变形,最终得到Ф3.5 mm的拉拔态试样,对其进行了600℃保温不同时间的退火试验,并通过组织形貌的观察、力学和电学性能的测试,研究了退火后纯铜试样组织与性能的关系。结果表明:拉拔态纯铜组织经退火后形成新的再结晶晶粒,并伴有退火孪晶比例的增加。随着退火时间的增长,再结晶晶粒不断长大,抗拉强度和断后伸长率小幅波动。退火态试样的平均抗拉强度为拉拔态的67.3%,平均断后伸长率是拉拔态试样的8倍,平均导电率比拉拔态提高约3.3%,且随着退火时间的增加导电性得到逐步提高。Multi-pass cold drawing deformation for Ф8 mm annealed T2 pure copper bar was carried out by the industrial wire drawing machine,and the drawn specimen of Ф3.5 mm was finally obtained.The annealing treatments at 600℃for different time were carried out,and the relationship between the microstructure and properties was analyzed by observing the morphologies and testing the mechanical and electrical properties.The results show that the new recrystallization grains are formed and accompanied by increase of annealing twin ratio after annealing.As the annealing time increase,the recrystallized grains grow continuously,the tensile strength and elongation after breaking fluctuates slightly.The average tensile strength and the elongation of annealed wires are about 67.3%and 8 times of that of as-drawn wires,respectively,and the average conductivity of annealed wires is about 3.3%higher than that of as-drawn wires,and the conductivity is gradually improved with the annealing time increase.

关 键 词：纯铜 高温长时退火 组织均匀性 力学性能 电学性能 

分 类 号：TG156.2[金属学及工艺—热处理]