Effect of Post Weld Heat Treatment on Corrosion Behavior of AA2014 Aluminum _ Copper Alloy Electron Beam Welds

[摘要] The present work pertains to the study of corrosion behavior of aluminum alloy electron beam welds. The aluminium alloy used in the present study is copper containing AA2014 alloy. Electron Beam Welding (EBW) was used to weld the alloys in annealed (O) condition. Microstructural changes across the welds were recorded and the effect of post weld heat treatment (PWHT) in T4 (Solutionized and naturally aged) condition on pitting corrosion resistance was studied. A software based PAR basic electrochemical system was used for potentio-dynamic polarization tests. From the study it is observed that weld in O condition is prone to more liquation than that of PWHT condition. This may be attributed to re-melting and solidification of excess eutectic present in the O condition of the base metal. It was also observed that slightly higher hardness values are recorded in O condition than that of PWHT condition. The pitting corrosion resistance of the PMZ/HAZ in PWHT condition is better than that of O condition. This is attributed to copper segregation at the grain boundaries of PMZ in O condition.

[发布机构] Department of Mechanical Engineering, GITAM Deemed University, Visakhapatnam, India^1;Department of Metallurgicaland Materials Engineering, NIT-Andhra Pradesh, India^2;Metal Joining Group, Defence Metallurgical Research Laboratory, Hyderabad, India^3;Department of Metallurgical Engineering, Andhra University, Visakhapatnam, India^4

[效力级别] 机械制造

[关键词] Copper segregation;Corrosion behavior;Electrochemical systems;Hardness values;Microstructural changes;Naturally aged;O-conditions;Post weld heat treatment