A study on the stress corrosion cracking susceptibility of friction stir welded Ti-6Al-4V alloy joints

The stress corrosion cracking (SCC) susceptibility of a friction stir welded (FSW) Ti-6Al-4V alloy was assessed through the slow strain rate tensile (SSRT) examinations in air and 3.5% NaCl solution at three temperatures of 25 °C, 37 °C and 80 °C. SSRT results showed that FSW deteriorated the SCC be...

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Bibliographic Details
Published in:Materials research express 2019-07, Vol.6 (9), p.96598
Main Authors: Chiani, Mohammad, Atapour, Masoud
Format: Article
Language:English
Subjects:
friction stir welding
stress corrosion cracking
Ti-6Al-4V
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Summary:The stress corrosion cracking (SCC) susceptibility of a friction stir welded (FSW) Ti-6Al-4V alloy was assessed through the slow strain rate tensile (SSRT) examinations in air and 3.5% NaCl solution at three temperatures of 25 °C, 37 °C and 80 °C. SSRT results showed that FSW deteriorated the SCC behavior of Ti-6Al-4V in all tested conditions. The fractography of the fractured specimens by SEM revealed that a dimpled fracture mode predominated in the failure of the heat affected zone of the FSWed specimens. Also, it was found that increasing the test temperature resulted in decreasing the fracture toughness of the base and weld metals. The microhardness examination of the welded specimen indicated that the stir zone (SZ) showed higher hardness values than that of the heat affected zone (HAZ). This behavior was attributed to the formation of finer and coarser grains in the SZ and HAZ, respectively.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ab30ad