Influence of Partition Chessboard Scanning Dimension on the Surface Quality and Corrosion Resistance of Laser Powder Bed Fusion-Fabricated Titanium-Based Nanocomposites

Abstract

The study investigates the effects of partition chessboard scanning dimension on the forming quality and the electrochemical corrosion mechanism of titanium-based nanocomposite materials. The research results indicate that as the partition chessboard scanning dimension increases (2, 5, 8, 11 mm), the average surface roughness (R_a value) of the TC4-0.5GO-7Mo nanocomposite material shows an increasing trend. The average Ra values for TC4-0.5GO-7Mo_PCSD2, TC4-0.5GO-7Mo_PCSD5, TC4-0.5GO-7Mo_PCSD8, and TC4-0.5GO-7Mo_PCSD11 are 5.39, 5.93, 6.61, and 9.32 μm, respectively. Compared to TC4-0.5GO-7Mo_PCSD2, the average Ra value of TC4-0.5GO-7Mo_PCSD11 increases by 72.9%. Different partition chessboard scanning dimensions result in varying degrees of residual stress, among which the residual stress value of TC4-0.5GO-7Mo_PCSD2 is the lowest, at only 295.7 MPa. The TC4-0.5GO-7Mo_PCSD5 sample exhibits significant electrochemical stability, with the highest polarization corrosion potential of −0.280 V, and the Nyquist plot shows the largest radius of the capacitive reactance arc, demonstrating the best resistance to electrochemical corrosion.