Aiming to improve the manufacturing accuracy of the build-in channels by selective laser melting (SLM), an anti-deformation model was established which was based on the simulation results of deformation and stress distribution of channel structure models with different length-depth ratios in SLM process by Simufact Additive software. It is demonstrated that the length of the channel structure is proportional to the deformation. Conversely, with the depth of the channel increases, the total distortion has a tendency of decreasing. The anti-deformation model can effectively reduce the amount of adhesive powder and deformation on the inner surface of printing parts, and improve the forming accuracy. In particular, the double-peak distortion occurs when the length and depth of the channel are 20 and 60 mm, respectively. Meanwhile, the roughness of overhanging surface is improved by 41.21% after compensating by anti-deformation mathematical model.

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Powder bed fusion laser beam, as one of the most promising forming technologies, offers unmatched benefits over traditional processing, particularly in the production of Ti-6Al-4V. The influence of laser line energy density (LLED) on the forming surface, phase composition, micro-hardness, tensile characteristics and wear resistance of Ti-6Al-4V alloy were explored to disclose the evolution of mechanical and tribological properties. According to the findings, the LLED causes 'depressions' and 'highlands' between nearby scanning tracks. The phase composition did not alter appreciably as LLED increased. Micro-hardness and tensile characteristics increased initially, then declined, and the value of maximum micro-hardness and ultimate tensile strength were 388.17 HV 0.2 and 1197.5 MPa, respectively. Furthermore, when the LLED is 0.24 J mm -1 , the wear resistance is optimal under the aviation lubricant medium, with an average friction coefficient of 0.1505 and volume wear rate of 6.95 * 10 −8 mm 2 * N −1 , and a wear mechanism of mild furrow wear and adhesion wear.

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