摘要
以架空导线常用的铝-镁-硅合金线材为研究对象,对其进行退火处理,主要研究退火温度对其强度的影响。研究结果表明:铝-镁-硅合金线在退火过程中强度的变化呈现三阶段特征:第一阶段,退火温度为90℃~150℃,合金线强度几乎不变;第二阶段,退火温度为150℃~250℃,合金线强度迅速下降;第三阶段,退火温度为250℃~300℃,合金线强度几乎不变。微观组织结构观察表明,铝-镁-硅合金线材强化机制为析出强化,细晶强化和织构强化。基于微观组织结构定量统计和理论计算,得出在退火温度为150℃~200℃时,线材强度的衰退是由球状纳米析出相向针状析出相转变引起的;退火温度为200℃~300℃时,析出相长大、晶粒宽度增大和<111>织构体积分数减小是其强度降低的主要原因。
The Al-Mg-Si alloy wire,which is commonly used in overhead conductor,is taken as the research object.And the effect of annealing temperature on its strength was studied.The results show that the strength of Al-Mg-Si alloy wire changes in three stages during annealing.In the first stage,the annealing temperature is 90 ℃ -150 ℃,and the wire strength of the alloy is almost unchanged.In the second stage,the strength of the alloy decreases rapidly when the annealing temperature is 150 ℃ -250 ℃.In the third stage,the annealing temperature is 250 ℃-300 ℃,and the wire strength of the alloy is almost unchanged.The microstructure observation shows that the strengthening mechanism of Al-MgSi alloy wire is precipitation strengthening,fine grain strengthening and texture strengthening.Based on the quantitative statistics and theoretical calculation of microstructure,it is concluded that the strength decline of Al-Mg-Si alloy wire is caused by the transformation from spherical nano precipitates to needle like precipitates when the annealing temperature is 150 ℃ -200℃.When the annealing temperature is 200 ℃ -300 ℃,the growth of precipitates,the increase of grain width and the decrease of < 111 > texture volume fraction are the main reasons for the decrease of strength.
作者
李海弘
陈庆吟
侯嘉鹏
王强
马恒
张哲峰
LI Hai-hong;CHEN Qing-yin;HOU Jia-peng;WANG Qiang;MA Heng;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10期39-47,共9页
Light Alloy Fabrication Technology
基金
国家电网浙江省电力公司项目(5211HD180007)。
