Manufacturing of Anti-Corrosive Surface Layer of Inconel 718 Superalloy
Microforging is a process that involves mechanical impact on the surface of a substrate using mi-croforging heads to achieve surface strengthening.In response to the issue of corrosion failure of superal-loys under deep-sea seabed conditions,a surface layer preparation technique based on the action of micro-forging mechanical impact is proposed to fabricate an anti-corrosive surface layer for Inconel 718 superalloy.Experimental results demonstrate that the Inconel 718 anti-corrosive surface layer prepared by microforging exhibits good density,fewer pores,and smaller grain size compared to the substrate,with the anti-corro-sion performance being at least one order of magnitude higher than that of the substrate.With the increase of surface layer thickness and the introduction of laser post-treatment,the anti-corrosion performance of the microforged surface layer shows an increasing trend.The mechanism behind the enhancement of c anti-corrosion performance of Inconel 718 superalloy by the surface layer is attributed to the excellent barrier effect and reduction of grain boundaries.Compared to the traditional anti-corrosive coatings,the micro-forged surface layer effectively prevents coating detachment,thus exhibiting better bonding strength and stability.A theoretical basis is provided for enhancing the service life of deep-sea oil and gas extraction e-quipment using microforging technology.