Abstract
Arc-based cold metal transfer additive manufacturing (CMTAM) technology presents an effective method for integrated construction of large metallic components. However, the cold metal transfer additive manufactured (CMTAMed) parts generally produce coarse columnar grains along the building direction, resulting in the anisotropy of tensile properties. In this paper, the effects of double-sided ultrasonic impact treatment (UIT) on the surface roughness, residual stress distribution, microstructure and tensile properties of the CMTAMed Ti6Al4V alloy in both horizontal and vertical directions were investigated. Results indicated that UIT significantly reduced surface roughness and realized the tensile-compressive conversion of residual stress in the surface layer. Furthermore, massive stacking faults (SFs) structures and high-density dislocations were stimulated in the original α martensite, leading to the grain refinement. Moreover, both the CMTAMed samples displayed synchronous enhancement of strength and ductility after double-sided UIT, while the growth rates of the horizontal samples are higher than that of the vertical ones, making a decline in the anisotropy of tensile properties. Consequently, the gradient microstructure and anisotropy regulation mechanism of tensile properties dominated by double-sided UIT was clarified.
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