Evaluation of the thermal aging of delta-ferrite in austenitic stainless steel welds by electrochemical analysis

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Cr-segregation by spinodal decomposition and G-phase precipitation were observed in delta-ferrite of austenitic stainless steel welds thermally aged at 400 degrees C for up to 20,000 h. A reversion heat treatment (R-HT) at 550 degrees C for 1 h dissolved the Cr-segregation in the aged welds while some intermetallic precipitates were present. The double-loop electrochemical potentiokinetic reactivation (DL-EPR) analysis showed no significant differences among them. However, after selective etching of the austenite phase, the DL-EPR values of delta-ferrite phase steadily increased with aging time due to the growth of Cr-depleted regions by spinodal decomposition. The electrochemical behavior of delta-ferrite after R-HT condition was similar to that of unaged welds, indicating the intermetallic precipitates did not affect the corrosion resistance in this case. Overall, DL-EPR analysis of delta-ferrite phase provided better correlation with spinodal decomposition.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-10
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.8

ISSN
2045-2322
DOI
10.1038/s41598-018-33422-x
URI
http://hdl.handle.net/10203/246317
Appears in Collection
NE-Journal Papers(저널논문)
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