Macro- and microgeometry analysis of SLM-manufactured CoCr stents
P. Kilina
, A. Drozdov
, A. G. Kuchumov
, L. Sirotenko
Abstract: Objective: to create stent mesh architectures with tunable macto- and microgeometry characteristics by design, numerical simulation, and selective laser melting. Materials and methods: CoCr powder and SLM stents bridges were evaluated by scanning electron microscopy (SEM), optical light microscopy and X-Ray tomography. NX software was used to create the sample designs. To analyze the residual stresses and displacements of the SLM part, simulations were performed in the ANSYS Additive Print. Stents were obtained by CoCr powders selective laser melting. Melting of CoCr powder was carried out in laser power 40-42.5 W, point distance 10-15 μm, exposition time 40-60 μs. Results: SLM of CoCr powders were used to obtain coronary stents grid structures with microporosity in the longitudinal and transverse directions is <1%. The pores do not exceed the size of powder particles and are in the range of 30-40 μm. Dimensional deviations from the 3D model were 0.01-0.07 mm. Discussion: The selected modes ensure uniform penetration of the internal structure, defects in the form of non-fusions and cracks between the layers and within each layer were not detected. However, differences in the formation of the surface layer have been revealed, depending on the fusion modes. Conclusion: As a result of SLM, stent designs with a height of 15 mm with a diameter of 2 mm and a bridge size of 150-220 μm were obtained. As a result of modeling and experimental studies, regimes have been established that allow the formation of stent framework defect-free or minimum defect elements.
Series on Biomechanics, Vol.38, No.4(2024),74-81
DOI: 10.7546/SB.11.04.2024
Keywords: CoCr alloy powder; macrogeometry; metal stent; microgeometry; Selective laser melting; X-Ray tomography
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| Date published: 2024-12-11
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