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

Publication date: 15 October 2017
Source:Materials & Design, Volume 132
Author(s): Tomasz Kurzynowski, Irina Smolina, Karol Kobiela, Bogumiła Kuźnicka, Edward Chlebus
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: IN718–14wt% Re layer with completely dissolved Re powder in substrate, and IN718–28wt% 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 3wt% NaCl solution. It was found that, alloying with 14wt% Re favourably affects corrosion resistance of IN718, as indicated by significant increase of critical pitting potential (+270mV) at 24% drop of corrosive current, and anodic displacement of corrosion potential (+100mV). In comparison to the IN718 substrate, the layer alloyed with 28wt% Re has 160% higher hardness, 82% lower sliding wear rate, and 25% higher abrasive wear resistance index.

Graphical abstract

http://ift.tt/2vnNazH