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Study on the Tensile and Shear Behaviors of Selective Laser Melting Manufactured Ti6Al4V
Hao Zhang,Tao Gao,Chang Xu,Lingyu Zhao,Haipeng Song,Ganyun Huang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
The deformation and failure of Ti6Al4V produced by Selective Laser Melting (SLM) under tensile and shear stress states have been experimentally investigated with different types of the samples. The digital image correlation (DIC) method was applied to observe the deformation, crack initiation and propagation behavior. The effects of building direction on the mechanical behavior were studied. The experimental results show that the yield strength and tensile strength of SLM manufactured Ti6Al4V along the build direction is slightly lower than the horizontal one, but the vertical samples have a higher ductility than horizontal samples. Fractographic analyses were conducted to investigate the damage mechanism and fracture mode of Ti6Al4V under different loading conditions. The defects and stress states have a significant influence on damage and failure behaviors of addictively manufactured Ti6Al4V alloy. The tensile stress tends to open up the defects in the vertically built specimen while the defects tend to be closed in the horizontally built specimen due to the building orientation. The nucleation, growth and coalescence of micro voids are the main damage mechanism of SLM fabricated Ti6Al4V alloy under tensile loading condition, and the void shearing mechanism dominates the failure of shear samples.
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