Abrasive Wear Characteristics of Additive Manufactured Inconel 718 Alloy Fabricated through Wire-Fed Laser Direct Energy Deposition
摘要
Inconel 718 is a nickel-based superalloy used in challenging environments, such as elevated temperatures and pressures, in aerospace engines and gas turbines. This study investigated the mechanical and wear behaviors of Inconel 718 alloy fabricated using wire-fed laser direct energy deposition additive manufacturing. The components were fabricated by varying the laser power (700, 800, and 900 watts) and scanning speed (500, 550, and 600 mm/min). Component fabricated at 900 W laser power exhibit 8.14 g/cm3 which implies lesser internal porosity due to almost fully dense material. An increase in the laser power and scanning speed increased the hardness of the deposited component from 266.18 to 314.61 Hv. A more uniform hardness distribution across the build surface was achieved at higher laser powers. A pin-on-disc apparatus was used to study the abrasive wear behavior by sliding the fabricated pin against SiC abrasive sheets of different grit sizes (80, 100, and 150 grit). The wear rate of the material decreased with an increase in the laser power and scanning speed, and the opposite trend was observed for the coefficient of friction. The component made with 900 watts of laser power and a scanning speed of 600 mm/min showed a maximum hardness of 314.61 ± 5.11 Hv and had better wear resistance with 1.67 × 10-5 m3/m of wear rate and a friction coefficient of 0.28.