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Title: Effect of Shot Peening on Stress Corrosion Cracking (SCC) of 7075-T6 Aluminium Alloy
Author: H. Rahmatalla, M. Al-Rimawi, T. Al-Hadid
Source: Conf Proc: ICSP-6, (p.184-191)
Publication year 1996
Document number: 1996065
Number of pages: 8
Abstract:
Shot Peening, using cast steel particles at different intensities varying from 6-10A was utilised to improve Stress Corrosion Cracking (SCC) of welded 7075-T6 Aluminium
alloy. Three-point loaded specimen was used as a necessary technique to evaluate the SCC in chloride enviroment. Specimens were tested in Long Transverse (LT) and Short
Transverse(ST) directions. An appreciable improvement due to shot peening, using all intensities was detected in the LT direction. However, Lower SCC resistance
improovement in ST direction was obtained when the specimen was shot peened at 8A intensity, only. Other intensities produced apprecialbe improvement. This improvement was
attributed to the development of a homogenous compressive layer. The developed layer was able to inhitit, crack iniation and propogation in the low temperature Heat
Affected Zone (HAZ) of the welded 7075-T6 Aluminium alloy, where high susceptibility to SCC in unpeened cndition was observed. In this investigation, an experimental
program could be predicted using shot peening to improve SCC resistance.
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