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- W65133365 abstract "Duplex stainless steels are chosen for many engineering applications in harsh and aggressive environments. However, a major drawback associated with the welding of these materials is increased susceptibility to sensitization. Many of the sensitization tests developed for stainless steels are destructive and only provide qualitative information. One non destructive method, namely a modified double loop electrochemical potentiokinetic reactivation (DL-EPR) test has been developed and applied successfully for quantitatively assessing the degree of sensitization in 2205 duplex stainless steels. However, this test is not suitable for the 2507 super duplex stainless steels. The focus of this study was to develop and optimize a procedure based around the DL-EPR test for assessing sensitization in super duplex stainless steels (AISI 2507). The study focused on optimization of the test parameters in order to induce sensitization in the samples. Metallographic samples were prepared from AISI 2507 SDSS 10 mm welded plate. Potentiodynamic scanning was performed from active to passive regions with a scan rate of 1.67mV/s, in selected electrolyte (acid and depassivator) media at varying concentrations and temperatures. The various weld regions, prior to and after corrosion testing, were characterized using optical microscopy, scanning electron microscopy and EDX analysis in order to determine morphological and compositional features and mechanisms associated with induced sensitization. The results from these findings are presented in this paper and the implications of the results discussed in terms of precipitation effects, chromium depletion, and sensitization of the different weld regions." @default.
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- W65133365 date "2010-12-01" @default.
- W65133365 modified "2023-09-23" @default.
- W65133365 title "Studies on the degree of sensitization of welded 2507 super duplex stainless steel using a modified DL-EPR test procedure" @default.
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