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- Title
Effect of grain size and residual stress on the corrosion resistance of friction stir spot welded AZ31B joints.
- Authors
Savguira, Y.; North, T. H.; Thorpe, S. J.
- Abstract
Localized corrosion at the weld periphery of AZ31B friction stir spot welds has been associated with the formation of a galvanic cell between the stir zone material and the adjacent base metal. However, this explanation did not take into account the effects of residual stress and grain growth in material adjacent to the stir zone region. In this study, the influence of microstructural changes on the electrochemical characteristics of FSSW joints is investigated using a combination of microcapillary polarization, stress relief heat-treatment and micro-hardness testing. It is confirmed that residual stress has no significant effect on the corrosion resistance properties of completed joints. Also, based on a detailed examination of the electrochemical characteristics of materials in the stir zone, TMAZ and HAZ regions, grain growth had negligible influence on the corrosion resistance properties.
- Subjects
GRAIN size; RESIDUAL stresses; CORROSION resistance; FRICTION stir welding; MAGNESIUM alloy welding
- Publication
Materials & Corrosion / Werkstoffe und Korrosion, 2016, Vol 67, Issue 10, p1068
- ISSN
0947-5117
- Publication type
Article
- DOI
10.1002/maco.201608925