Stress corrosion cracking of austenitic weld deposits in a salt spray environment

ER 308L and 309LMo were utilized as the filler metals for the groove and overlay welds of a 304L stainless steel substrate, which was prepared via a gas tungsten arc-welding process in multiple passes. U-bend and weight-loss tests were conducted by testing the welds in a salt spray containing 10 wt%...

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Bibliographic Details
Published in:Journal of nuclear materials 2015-10, Vol.465, p.774-783
Main Authors: Cai, J.B., Yu, C., Shiue, R.K., Tsay, L.W.
Format: Article
Language:English
Subjects:
308L deposit
309LMo deposit
Austenitic stainless steels
Cold rolling
Cracks
Deposits
Fusion zone
Sprayers
Sprays
Stress corrosion cracking
U-bend
Weight loss
Welded joints
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Summary:ER 308L and 309LMo were utilized as the filler metals for the groove and overlay welds of a 304L stainless steel substrate, which was prepared via a gas tungsten arc-welding process in multiple passes. U-bend and weight-loss tests were conducted by testing the welds in a salt spray containing 10 wt% NaCl at 120 °C. The dissolution of the skeletal structure in the fusion zone (FZ) caused the stress corrosion cracking (SCC) of the weld. The FZ in the cold-rolled condition showed the longest single crack length in the U-bend tests. Moreover, sensitization treatment at 650 °C for 10 h promoted the formation of numerous fine cracks, which resulted in a high SCC susceptibility. The weight loss of the deposits was consistent with the SCC susceptibility of the welds in a salt spray. The 309LMo deposit was superior to the 308L deposit in the salt spray. •ER 308L and 309LMo were utilized as fillers for the groove and overlay welds of a 304L SS.•U-bend and weight-loss tests in a salt spray containing 10 wt% NaCl at 120 °C were performed.•The dissolution of solidified structure caused the SCC of the welds in a salt spray.•Sensitization treatment increased the weight loss and SCC susceptibility of the deposits.•The weight loss of the weld deposits was related to their SCC susceptibility in a salt spray.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2015.06.060