The Effect Of Hf-Hno3 Chemical Polishing On The Surface Roughness And Fatigue Life Of Laser Powder Bed Fusion Produced Ti6al4v
MATERIALS TODAY COMMUNICATIONS(2020)
摘要
Metal additive manufacturing is increasingly utilised for the production of customised components. Post-process operations are required to address the high surface roughness of as-built components which is detrimental for load-bearing applications. Parts produced by metal additive manufacturing often have complex- surfaces and geometrical features rendering mechanical finishing processes impractical. This study investigates the chemical polishing of laser powder bed fusion (LPBF) produced Ti6Al4V axial fatigue test specimens in HF-HNO3 solutions with different initial HF concentrations (1, 2, and 4 M) and a constant initial HNO3 concentration (3.17 M). Polishing efficacy was evaluated in terms of mass removal, surface roughness reduction, and resulting tension-tension fatigue strength. The 4 M HF solution resulted in both the highest mass removal and surface roughness reduction; however, when evaluated relative to resource consumption, the processing efficiency decreases more drastically than that of the 1 and 2 M HF solutions. Specimens polished in all three solutions had higher fatigue strengths and fewer surface crack initiation sites than the as-built condition. Specimens polished in 2 M solutions exhibited better fatigue performance than specimens polished in 1 M solutions while statistical significance was lacking between the fatigue strengths of specimens polished in 2 M and 4 M solutions.
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关键词
Additive manufacturing, Hydrofluoric acid, Pickling, Surface roughness, Fatigue
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