Effect of Sample‐Build Orientation on the Tensile Deformation and Properties of Ti6Al4V Processed by Laser Powder Bed Fusion

Shoujin Sun, Duyao Zhang, Suresh Palanisamy, Qianchu Liu, Michael Schmidt, Matthew S. Dargusch

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of sample‐build orientation on the tensile properties and deformation behavior of Ti6Al4V fabricated by laser powder bed fusion (LPBF) has been investigated by examining the changes in X‐ray diffraction spectra, microstructure, and dimension on the longitudinal cross‐sections after fracture. The anisotropy in strength is dominated by the difference in martensite (α′) lattice distortion, and the highest strength is achieved in the diagonally built sample (Z45) due to its largest α′ lattice distortion. The plastic deformation is mainly accommodated by sliding and micro‐void formation between α′ laths due to the insufficient number of slip systems in hexagonal close‐packed α′ phase. Therefore, the spatial orientation of α′ laths with respect to the loading direction is critical to the ductility. Different deformation mechanisms have been observed in different prior‐β grains due to their different α′ crystallographic orientations. The highest elongation is achieved in the vertically built sample (Z) because α′ laths in the vertically built sample are spatially at ±45° with the loading axis.
Original languageEnglish
Article number2400942
JournalAdvanced Engineering Materials
Volume26
Issue number21
Early online date30 Sept 2024
DOIs
Publication statusPublished - 1 Nov 2024

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Funding

The authors acknowledge the use of facilities at RMIT University within the Advanced Manufacturing Precinct Digital Manufacturing Facility and the RMIT Microscopy & Microanalysis Facility, a linked laboratory of Microscopy Australia. This research project was supported by DMTC Limited (Australia). The paper was written in line with the intellectual property rights granted to research partners from the original DMTC project. Open access publishing facilitated by Griffith University, as part of the Wiley - Griffith University agreement via the Council of Australian University Librarians.

Keywords

  • Ti6Al4V
  • anisotropy
  • build orientation
  • laser powder bed fusion
  • mechanical property

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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