Abstract
The stress corrosion resistance of commercial 7075, 7175 and 7475 alloys plates 60mm in thickness was investigated. The resistance of these specimens strongly depends on the orientation of specimen, T-L specimens have the resistance highly superior to that of S-L specimens. The overaging treatment (T7) is extremely effective for improvement of the resistance of these alloys. The residual stress removing treatment (TX51) has a considerable effect to improve the resistance of S-L specimens, but has little effect to do the resistance of T-L specimens. S-L specimens show intergranular stress corrosion cracking, while T-L specimens show ductile fracture with many laminated cracks on intergranular stress corrosion cracks. Stress corrosion cracks are attended by a hydrogen embrittled zone pre-existing ahead of the crack. Nucleation and propagation of the crack take place under an assistance of hydrogen embrittlement.
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