|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Environmental Degradation of Additively Manufactured Alloys
||Microstructure and Electrochemical Response of Selective Laser Melted NiTi
||Anurag Srivastava, Chaudhry A Usman, Bilal Mansoor, Chen Zhang, Ibrahim Karaman, Alaa Elwany
|On-Site Speaker (Planned)
This research fabricated the NiTi alloy cubes with SLM and explored the influence of laser power and hatch spacing on its microstructure and electrochemical response. Specimens were fabricated with different laser power, scan speed (80 W/330 mm.s-1, 200 W/1080 mm.s-1) and hatch spacing (64 Ám, 80 Ám). Electrochemical analyses, in Hanks’ Balanced Salt Solution at 37⁰C, were carried out on surfaces that were parallel and perpendicular to the building direction and were correlated to the microstructure. Microstructures of the specimens were investigated through optical microscopy and SEM. Our initial results indicate that the transverse surface presented columnar grains while the longitudinal surface showed chessboard-like grains. Electrochemical properties determined using electrochemical impedance spectroscopy and potentiodynamic polarization showed that samples fabricated with higher laser power, scan speed and lower hatch spacing had better corrosion properties. Pitting corrosion was observed with pits initiating from porosity defects present in the samples.
||Other, Other, Other