Abstract
In this study, Inconel 625 superalloy was laser peened without protective coating to advance its electrochemical characteristics. For this purpose, a water penetrable laser source (wavelength ~532nm) was operated at two power densities (6 and 9GWcm−2). Substantial residual compressive stresses developed at 9GWcm−2 whilst they were preponderantly tensile and anisotropic at 6GWcm−2. Hardness was unchanged after peening due to higher strength of the alloy. Peening increased the roughness but it is merely ≤1μm. Corrosion rate exceedingly lowered about ~104 times at 6GWcm−2 compared to other conditions with a belittled current density fluctuation over certain applied potential range due to increased roughness. No pitting resulted in untreated and peened specimens. Threefold increase in charge transfer resistance noticed at 6GWcm−2 owing to enhanced defect density (measured with X-ray peak broadening).
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