Abstract
UNS N06625, commonly known as Inconel 625, is a Nickel-Chromium-Molybdenum alloy with a very good corrosion resistance to a wide range of corrosive media and therefore the favorable choice for sea water applications. However, fusion welding operations may compromise its optimal corrosion resistance if a corrective post welding heat treatment (PWHT) is not carried out. In this scenario, optimum induction PWHT parameters are not yet consolidated so that there are still uncertainties that need to be investigated by proper experiments.Two short-term induction PWHTs (holding time, 20 min) at 980 and 1050 °C were investigated and correlated with both microstructural and corrosion resistance of the welded joints, according to Standard ASTM G28 A. Inter-dendritic segregations of key alloy elements have been identified as the main cause of the corrosive attack initiation. The temperature of 1050 °C was found to be the most effective to restore the corrosion resistance of the investigated welded joint.
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