增材制造 316L 不锈钢球形破片的弹道性能

The ballistic performance of additively manufactured 316L stainless steel (AM SS316L) spherical fragments is explored in this study. The SS316L blanks are printed by using selective laser melting (SLM) technology. AM SS316L spherical fragments with 12 mm diameter are obtained by the machining and polishing processes. The micro-computed tomography (CT), static and dynamic mechanical tests of the as-built SS316L are conducted, and Johnson-Cook (JC) material parameters in the material deposition direction are obtained for SS316L materials. Hereafter, the ballistic test of AM and traditional cold-rolled SS316L fragments penetrating a 6. 0 mm-thick Q235 steel target is carried out. The test results show that the ballistic limit velocity of AM SS316L spherical fragments is lower than 2. 5% than that of the cold-rolled fragments and its ballistic performance is slightly improved, indicating the potential of the AM technology in fabricating the pre-formed fragments. Finally, the numerically simulated results show a shear plugging mechanism consistent with experimental results. The simulated and test velocity perforation data have a good agreement, and the ballistic limit velocity error is only about 1. 4% . At the same time, the simulated results also show that the JC model can be used to describe the perforation behaviors of AM SS316L materials.