| 退火工艺对T2纯铜线材组织和性能的影响 |
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| 引用本文： | 毛西秦,肖秋雷,欧梅桂,梁宇,龙玮.退火工艺对T2纯铜线材组织和性能的影响[J].金属热处理,2020,45(7):7-10. |
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| 作者姓名： | 毛西秦 肖秋雷 欧梅桂 梁宇 龙玮 |
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| 作者单位： | 1. 贵州大学 材料与冶金学院, 贵州 贵阳 550025;2. 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;3. 贵州固达电缆有限公司, 贵州 安顺 561000 |
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| 基金项目： | 贵州省教育厅工程研究中心项目;贵州省科技计划 |
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| 摘 要： | 通过冷拉拔塑性成形制备了T2纯铜线材,然后对其进行了400 ℃×60 min低温长时退火和850 ℃×(20,40,60) s高温短时退火试验。通过光学显微镜、扫描电镜、万能试验机和直流双臂电桥等,研究了不同状态线材的微观组织、力学和电学性能。研究表明:拉拔态纯铜线材的纤维状组织在退火后形成了再结晶晶粒,并伴有退火孪晶出现。随着850 ℃退火保温时间的增加,退火线材的再结晶晶粒不断长大,晶粒形貌更趋向等轴晶,组织均匀性得到提高。退火态线材的平均抗拉强度约是拉拔态的57.1%;断后伸长率约是拉拔态10倍;经400 ℃×60 min退火,其导电率比拉拔态线材仅提高约0.3%;经850 ℃×(20,40,60) s退火其平均导电率比拉拔态线材提高约5.2%。高温短时退火后线材的综合力学性能和电学性能不仅比低温长时退火的性能较优,而且其具有较高的退火效率。拉拔态线材经850 ℃×40 s高温短时退火后具有较高的综合力学性能和导电性能。
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| 关 键 词： | 纯铜 退火 力学性能 导电性能 |
| 收稿时间： | 2020-01-12 |
Effect of annealing process on microstructure andproperties of pure copper wire T2 |
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| Mao Xiqin,Xiao Qiulei,Ou Meigui,Liang Yu,Long Wei.Effect of annealing process on microstructure andproperties of pure copper wire T2[J].Heat Treatment of Metals,2020,45(7):7-10. |
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| Authors: | Mao Xiqin Xiao Qiulei Ou Meigui Liang Yu Long Wei |
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| Affiliation: | 1. College of Materials and Metallurgy, Guizhou University, Guiyang Guizhou 550025, China;2. National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology, Guiyang Guizhou 550025, China;3. Guizhou Guda Cable Co., Ltd., Anshun Guizhou 561000, China |
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| Abstract: | T2 pure copper wire was obtained by cold drawing, then low-temperature long-term annealing (400 ℃×60 min) and high-temperature short-term annealing (at 850 ℃ for 20, 40, 60 s, respectively) tests were carried out. The microstructure, mechanical and electrical properties of the wires in different states were studied by means of OM, SEM, universal testing machine and DC wheat stone bridge. The results show that the fibrous structure of the cold drawn T2 pure copper wire forms recrystallized grains after annealing accompanied by annealing twins. With the increase of annealing time at 850 ℃, the recrystallized grains of the wire grow continuously, and the grains morphologies tend to equiaxed, and the uniformity of wire structure is improved. The average tensile strength of annealed wire is about 57.1% of that of drawn wire, the percentage elongation after breaking was about 10 times of that of drawn wire, after annealing at 400 ℃ for 60 min, the conductivity of the wire is only 0.3% higher than that of the drawn wire; after annealing at 850 ℃ for 20,40 and 60 s, the average conductivity of the wire is 5.2% higher than that of the drawn wire. The mechanical and electrical conductivity properties of the wire after high-temperature short-time annealing are not only better than low-temperature long-time annealing, but have a higher annealing efficiency. In conclusion, the wire annealed at 850 ℃ for 40 s has high mechanical properties and electrical conductivity. |
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| Keywords: | pure copper annealing mechanical properties electrical property |
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