Stress Corrosion Behavior of MIG Welded Joints of 6082-T6 Aluminum Alloy at Different Temperatures  

作　　者：Guanda Qu Wei Guo Hongqiang Zhang Zhikang Shen Lijiao Zhang Wei Dai Jun Xiao Junliang Xue Hongbin Zhu Minggao Li Xin Ren 

机构地区：[1]School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China [2]College of Engineering and Technology,Southwest University,Chongqing 400715,China [3]CRRC Industrial Academy Co.,Ltd.,Beijing 100071,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第6期591-600,共10页中国机械工程学报(英文版)

基　　金：Supported by Beijing Municipal Natural Science Foundation of China(Grant Nos.3202016,52175283)。

摘　　要：6082-T6 aluminum alloy is a commonly used aluminum alloy material in the field of rail transit because of its good molding properties,high mechanical properties,excellent corrosion resistance and weldability.In the high temperature and humid environment,the temperature change is bound to affect the stress corrosion resistance of the aluminum alloy and their welded joint.However,the influence mechanism of temperature on its stress corrosion resistance has not been explained in the existing research.In this paper,the mechanical properties and stress corrosion behaviors of melt-inert gas welded(MIG)6082-T6 aluminum alloy welded joints were systematically studied under various temperatures condition.Results indicated the temperature scarcely affected stress corrosion cracking susceptibility index(P_(SCC))of base metal,while significantly affected the welded joint and higher temperature caused lower P_(SCC).After slow strain rate tensile test,a corrosion layer was formed,which was a typical brittle-toughness mixed failure,and the degree of brittleness increased with the increasing of temperature.Electrochemical analysis showed that corrosion resistance of the joint slightly decreased due to aluminum alloy accelerated dissolution caused by increasing of temperature.The proposed research will provide a theoretical basis for solving aluminum alloys used in rail transit,ship accessories and other industrial fields.

关 键 词：Aluminum alloy Stress corrosion Fracture surface Electrochemical behaviors 

分 类 号：TG1[金属学及工艺—金属学]