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Inconel 718 is one of the most important superalloys, and it is mainly used in the aerospace field on account\udof its high mechanical strength, good resistance to fatigue and creep, good corrosion resistance and ability to operate\udcontinuously at elevated temperatures. In this work the resistance to pitting corrosion of a superalloy, Inconel 718, is\udanalyzed before and after double aging heat treatment. The used heat treatment increases the creep resistance of the\udalloy, which usually is used up to 0.6 Tm. Samples were subjected to pitting corrosion tests in chloride-containing aqueous\udsolution, according to ASTM-F746-04 and the procedure described by Yashiro et al. The results of these trials show that\udafter heat treatment the superalloy presents higher corrosion resistance, i.e., the pitting corrosion currents of the as\udreceived surfaces are about 6 (six) times bigger (~0.15 mA) than those of double aged surfaces (~0.025 mA)

ANALYSIS OF PITTING CORROSION ON AN INCONEL 718 ALLOY SUBMITTED TO AGING HEAT TREATMENT