Wear and corrosion behaviour of Inconel 718 laser surface alloyed with rhenium

Add time:08/14/2019    Source:sciencedirect.com

Laser surface alloying (LSA) with rhenium was applied to produce wear and corrosion resistant layers on Inconel 718 alloy. Using a high-power diode laser and 50% overlapping ratio of laser tracks, two kinds of alloyed layers were produced: IN718–14 wt% Re layer with completely dissolved Re powder in substrate, and IN718–28 wt% Re layer with partially dissolved Re powder in substrate. Examinations of microstructure and tribological properties were carried-out of both alloyed layers and substrate under sliding and abrasive wear conditions, as well as electrochemical measurements were made in 3 wt% NaCl solution. It was found that, alloying with 14 wt% Re favourably affects corrosion resistance of IN718, as indicated by significant increase of critical pitting potential (+ 270 mV) at 24% drop of corrosive current, and anodic displacement of corrosion potential (+ 100 mV). In comparison to the IN718 substrate, the layer alloyed with 28 wt% Re has 160% higher hardness, 82% lower sliding wear rate, and 25% higher abrasive wear resistance index.

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