Evolution of Microstructure and Stress Corrosion Cracking Behavior of AA2219 Plate to Ring Weld Joints in 3.5 Wt Pct NaCl Solution

AA2219 aluminum alloy plate (T87) and ring (T851) were joined by tungsten inert gas (TIG) welding using multi-pass welding. The mechanical properties and stress corrosion cracking (SCC) resistance of the above base metals (BMs) in different directions (L, LT, and ST) were examined. Similarly, the we...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2016-04, Vol.47 (4), p.1607-1620
Main Authors: Venugopal, A., Narayanan, P. Ramesh, Sharma, S. C.
Format: Article
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion resistance
Grain boundaries
Joint surgery
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanotechnology
Physical metallurgy
Segregations
Stress corrosion cracking
Structural Materials
Surfaces and Interfaces
Thin Films
Welded joints
Welding
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Summary:AA2219 aluminum alloy plate (T87) and ring (T851) were joined by tungsten inert gas (TIG) welding using multi-pass welding. The mechanical properties and stress corrosion cracking (SCC) resistance of the above base metals (BMs) in different directions (L, LT, and ST) were examined. Similarly, the weld metal joined by plate to plate and plate to ring (PR) joints was evaluated. The results revealed that the mechanical properties of the ring were comparatively lower than the plate. This was found to be due to the extremely coarse grain size of the ring along with severe Cu-rich segregation along the grain boundaries when compared to the plate material. The SCC resistance of the base and weldments were found to be good and not susceptible to SCC. This was shown to be due to high values of SCC index (>0.9) and the typical ductile cracking morphology of the BM and the weld joints after SCC test in the environment (3.5 wt pct NaCl) when compared to test performed in the control environment (air). However, the corrosion resistance of the weld interface between the FZ and ring was inferior to the FZ–plate interface.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-016-3332-y