Abstract
Cast hyper duplex stainless steel (HDSS) was modified with a stabilizer Niobium to suppress the formation of deleterious intermetallic phases. Based on the Thermo calc, samples were heat treated at 900 °C and 1150 °C. Intergranular corrosion resistance was studied with the help of double loop electrochemical potentiokinetic reactivation (DL-EPR) method. Surface of the specimen was characterized by optical microscope, SEM coupled with EDS. Addition of niobium retards the formation of chromium carbides and the same was confirmed with EDS point analysis. DL-EPR shows the better degree of sensitization for niobium stabilized cast HDSS than the regular HDSS.
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