Ohio State University (OSU) - Department of Materials Science and Engineering (MSE)
Date Written: February 19, 2024
Abstract
This study reports a new mechanism of grain boundary (GB) sensitization without precipitation of Cr-rich phases at GBs in Cu-containing Ni-Cr-Fe alloys. Copper segregation at GBs during annealing can deplete the boundaries of Cr due to the repulsive interaction between Cr and Cu. The depletion of passivating Cr along GBs can cause intergranular corrosion susceptibility, as evidenced by electrochemical testing and post-mortem morphological characterization. The implications of this new sensitization mechanism on the localized corrosion resistance of Cu-containing commercial alloys are discussed.
Hariharan, Karthikeyan and Feng, Longsheng and Kadirvel, Kamalnath and Karunakaran, Vignesh and Kosanam, Koushik and Sridhar, Narasi and Wang, Yunzhi and Frankel, Gerald S. and Schindelholz, Eric J., Localized Corrosion of Thermally Aged Cu-Containing Ni-13Cr-10Fe Alloys: The Role of Cu Enrichment Induced Grain Boundary Sensitization (February 19, 2024). Available at SSRN: https://ssrn.com/abstract=4731330 or http://dx.doi.org/10.2139/ssrn.4731330
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