摘要
架空导线是重要的输电载体,常用6201铝合金线作为输电材料,人工时效处理是生产中调节其性能的重要工艺环节。行业现在使用的人工时效一般持续4h^8h,长时间的时效降低了6201铝合金线的生产效率。然而,缩短时效时间意味着需要提高时效温度,高温时效处理会导致6201铝合金线位错回复、晶粒和析出相长大,可能导致产品性能不合格。因此,如何在确保6201铝合金线微观组织结构稳定的前提下,开发快速时效工艺制备铝合金线有许多工作要做。基于理论研究,提出了一种快速时效工艺,将时效时间缩短至0.5 h,并且制备了高强高导性能6201铝合金线(抗拉强度341.0 N/mm2,导电率54.73%IACS),强度和导电率均远超国标的;微观组织观察表明,6201铝合金线为超细晶和大量纳米析出相的组织特征,未见位错回复、晶粒和析出相长大现象。这一研究成果对架空导线用6201铝合金线的生产具有指导意义。
Overhead conductors are important transmission carriers.6201 aluminum alloy wires are commonly used as transmission materials.Artificial aging treatment is an important process to adjust their performance in production.The artificial aging currently used in the industry generally lasts for 4 h-8 h,and the long-time aging reduces the production efficiency of 6201 aluminum alloy wire.However,shortening aging time means increasing aging temperature.High temperature aging treatment will lead to dislocation recovery,grain and precipitation growth in 6201 aluminum alloy wire,which may lead to unqualified product performance.Therefore,there is a lot of work to do on how to develop the rapid aging process for aluminum alloy wire under the premise of ensuring the microstructure stability of 6201 aluminum alloy wire.Based on the theoretical research,a rapid aging process was proposed,which shortened the aging time to 0.5 h,and 6201 aluminum alloy wire was prepared with high strength and high conductivity(tensile strength 341.0 N/mm2 and conductivity 54.73%IACS).The strength and conductivity of 6201 aluminum alloy wire far exceeded the internation alloy standard ones.Microstructure observation shows that 6201 aluminum alloy wire is characterized by ultra-fine grains and a large number of nano precipitates,and no dislocation recovery,grain or precipitate growth are observed.This research result has important guiding significance for the production of 6201 aluminum alloy wire for overhead conductor.
作者
李瑞
陈庆吟
蔡新华
董璇
侯嘉鹏
王强
张哲峰
LI Rui;CHEN Qing-yin;CAI Xin-hua;DONG Xuan;HOU Jia-peng;WANG Qiang;ZHANG Zhe-feng(National Quality Supervision&Inspection Center of Electrical Equipment Safety Performance,Zhejiang Huadian Equipment Testing Institute Co.Ltd.,Hangzhou 310015,China;Laboratory of Fatigue and Fracture for Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《轻合金加工技术》
CAS
北大核心
2020年第9期51-57,共7页
Light Alloy Fabrication Technology
基金
国家电网浙江省电力公司项目(5211HD180007)。
关键词
6201铝合金线
人工时效
强度
导电率
微观组织结构
6201 aluminum alloy wire
artificial aging
strength
electrical conductivity
microstructure
