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文章编号： 1672-6987（2020）03-0074-06； DOI： 10.16351/j.1672-6987.2020.03.010
赵朋成， 唐洪磊， 张锋， 王璐璐*
(青岛科技大学 机电工程学院，山东 青岛 266061)
摘要： 选取A7N01S-T5铝合金及其MIG焊接接头，采用慢应变拉伸（SSRT）、扫描电镜（SEM）和能谱仪（EDS）等测试手段研究腐蚀环境和慢应变速率对焊接接头应力腐蚀开裂（SCC）行为的影响。结果表明，35%NaCl腐蚀环境下焊接接头的自腐蚀敏感性高于母材。母材和焊接接头应力腐蚀敏感性随慢应变速率的升高而增大，且焊接接头的应力腐蚀敏感性远高于母材。拉伸速率超过5×10-6 mm·s-1后，接头的应力腐蚀加速。试样SSRT断口的SEM分析表明：母材和焊接接头在空气中以脆性断裂为主，在35%NaCl腐蚀环境中均发生典型应力腐蚀开裂，但焊接接头对腐蚀环境的应力腐蚀敏感性更高。
关键词： A7N01S-T5铝合金； MIG焊接接头； 应力腐蚀行为； 慢应变拉伸
中图分类号： TG 40文献标志码： A
引用格式： 赵朋成， 唐洪磊， 张锋， 等. A7N01S-T5铝合金MIG焊接接头的应力腐蚀行为\[J\]. 青岛科技大学学报（自然科学版）， 2020， 41（3）： 74-79.
ZHAO Pengcheng， TANG Honglei， ZHANG Feng， et al. Stress corrosion cracking behaviors of A7N01S-T5 aluminum MIG welding joints\[J\]. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2020， 41（3）： 74-79.
Stress Corrosion Cracking Behaviors of A7N01S-T5 Aluminum
MIG Welding JointsZHAO Pengcheng， TANG Honglei， ZHANG Feng， WANG Lulu
(College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)Abstract: The A7N01S-T5 aluminum alloy and its metal inert gas (MIG) welding joints are investigated to study the effects of environments and strain rates on stress corrosion cracking (SCC) behaviors of welding joints by slow strain-rate test (SSRT), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). Results show that welding joints exhibit higher self-corrosion susceptibility than base metals in 35%NaCl solution. The stress corrosion susceptibilities of both base metals and welding joints increase with the slow strain rate, while the welding joints have much higher stress corrosion susceptibilities than the base metal. The welding joints present an accelerating stress corrosion behavior when the loaded tensile rate is excess than 5×10-6 mm·s-1. SEM analysis of SSRT fractures indicate that the base metal and the welding joint exhibit brittle failure in air, whereas they present typical stress corrosion cracking in 35%NaCl solution. Moreover, the welding joint has a higher stress corrosion susceptibility to corrosion environment than base metal.
Key words: A7N01S-T5 aluminum alloy； MIG welding joint； stress corrosion behavior； slow strain rate test
收稿日期： 2019-03-04
基金项目： 山东省自然科学基金项目（ZR2017PEE017）.
作者简介： 赵朋成（1972—），男，副教授.*通信联系人.
