Crystallographic texture dependent bulk anisotropic elastic response of additively manufactured Ti6Al4V

Rapid thermokinetics associated with laser-based additive manufacturing produces strong bulk crystallographic texture in the printed component. The present study identifies such a bulk texture effect on elastic anisotropy in laser powder bed fused Ti6Al4V by employing an effective bulk modulus elastography technique coupled with ultrasound shear wave velocity measurement at a frequency of 20 MHz inside the material. The combined technique identified significant attenuation of shear velocity from 3322 +/- 20.12 to 3240 +/- 21.01 m/s at 45 degrees and 90 degrees. orientations of shear wave plane with respect to the build plane of printed block of Ti6Al4V. Correspondingly, the reduction in shear modulus from 48.46 +/- 0.82 to 46.40 +/- 0.88 GPa was obtained at these orientations. Such attenuation is rationalized based on the orientations of alpha' crystallographic variants within prior columnar beta grains in additively manufactured Ti6Al4V.

Automated summary

This study investigates the influence of bulk crystallographic texture on elastic anisotropy in laser powder bed fused Ti6Al4V. Significant attenuation of shear wave velocity and shear modulus at specific orientations is identified through effective bulk modulus elastography technique coupled with ultrasound shear wave velocity measurement within the material. The findings are rationalized based on the orientations of alpha' crystallographic variants within prior columnar beta grains in additively manufactured Ti6Al4V.