Research on Anisotropy in Tensile Properties and Damage Behavior of Ti150 Alloy Fabricated by Laser Powder Bed Fusion AITranslate

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Chinese Library Classification Number:TG146.23[一般工业技术]

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To clarify the influence of anisotropy induced by additive manufacturing on the damage behavior of titanium alloy components,Ti150 alloy specimens were fabricated using laser powder bed fusion technology in both vertical and horizontal build directions.The effects of build direction on the microstructure,tensile property anisotropy,and damage mechanism of the alloy were investigated.The results indicate that both vertically and horizontally built specimens form prior-βcolumnar grains along the build direction,with continuous or discontinuousα_GB phases precipitated at the prior-βgrain boundaries.Due to the collective influence of prior-βgrain boundary orientation andα_GB phase continuity on dislocation motion,the tensile properties of the vertically and horizontally built specimens exhibit anisotropy,primarily manifested as elongation differences.Quasi-in-situ tensile tests reveal that the continuousα_GB phase and prior-βgrain boundaries exhibit significant loading anisotropy,which provides favorable conditions for crack initiation and propagation,ultimately deteriorating the elongation of horizontally built specimens.