Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第12期    总第225期    2017年12月

[PDF全文下载]    [Flash在线阅读]    

    

文章编号:1004-0609(2017)-12-2483-10
焊后热处理对Al-Zn-Mg合金焊接接头组织与性能的影响
杜春平1,王培吉2, 3

(1. 桂林航天工业学院 实践教学部,桂林 541004; 2. 中南大学 粉末冶金研究院,长沙 410083; 3. 成都京东方光电科技有限公司,成都 611731)

摘 要: 采用金相、硬度、电导率、剥落腐蚀、电化学腐蚀以及透射电镜(TEM)观察等分析测试方法研究焊后热处理对Al-Zn-Mg合金组织与性能的影响。结果表明:Al-Zn-Mg合金焊接接头固溶区的硬度和耐腐蚀性能随焊后热处理时效时间的延长和温度的提高而提升。自然时效4 d+(130 ℃, 24 h)和自然时效150 d+(150 ℃, 2 h)两种焊后热处理工艺较佳:经自然时效4 d+(130 ℃, 24 h)处理后,合金固溶区最大硬度由82.5HV提高至123HV,最大电导率由34%IACS提高至35.8%IACS,剥蚀等级提升至EA;经自然时效150 d+(150 ℃, 2 h)处理后,合金固溶区最大硬度提高至110HV,最大电导率至34.7%IACS,剥蚀等级提升至N。合金焊接接头固溶区硬度与耐腐蚀性能提升的主要原因是焊后时效热处理促进焊接固溶区晶内析出相粗化,弥散分布,且晶界析出相呈不连续分布状。

 

关键词: Al-Zn-Mg合金;焊后热处理;时效;硬度;腐蚀性能

Effect of post-welding heat treatment on microstructure and properties of Al-Zn-Mg alloy welded joint
DU Chun-ping1, WANG Pei-ji2, 3

1. Practical Teaching Department, Guilin University of Aerospace Technology, Guilin 541004, China; 2. Institute of Powder Metallurgy, Central South University, Changsha 410083, China; 3. Chengdu Beijing Oriental Electronics Optoelectronics Technology Co., Ltd., Chengdu 611731, China

Abstract:The effects of post-welding heat treatment on microstructure and properties of Al-Zn-Mg alloy welded joint were studied by optical microstructure, hardness, conductivity, exfoliation corrosion testing, electrochemical corrosion testing and transmission electron microscopy (TEM) testing. The results show that the hardness and corrosion resistance of welded joint at solid solution zone of Al-Zn-Mg alloy increase with post-welding aging time and temperature increasing. Two kinds of optimum post-welding heat treatment to Al-Zn-Mg alloy are natural aging for 4 d+artificial aging at (130 ℃, 24 h) and natural aging for 150 d+artificial aging at (150 ℃, 2 h). The maximum hardness of welded joint at solid solution zone of Al-Zn-Mg alloy increases from 82.5HV to 123HV, the maximum conductivity increases from 34%IACS to 35.8%IACS and the denudation level reaches to EA after natural aging 4 d+artificial aging at (130 ℃, 24 h) treatment. The maximum hardness of welded joint at solid solution zone of Al-Zn-Mg alloy increases from 82.5HV to 110HV, the maximum conductivity increase from 34%IACS to 34.7%IACS and the denudation level reaches up to N after natural aging for 150 d+artificial aging at (150 ℃, 2 h) treatment. The reason why aging treatment can improve the hardness and corrosion resistance of welded joint at solid solution zone of Al-Zn-Mg alloy is that the intragranular precipitate phase are coarsening and dispersion distribution, also the grain boundary precipitate phase distribution are discontinuous.

 

Key words: Al-Zn-Mg alloy; post-welding heat treatment; aging; hardness; corrosion property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com