Microstructural control in a Ti-based alloy by changing laser processing mode and power during direct laser deposition

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes


Ti-6Al-4V samples have been fabricated by direct laser deposition using different laser powers and two different laser processing modes, continuous wave (CW) mode and CW+PW (pulsed wave) mode. The as-fabricated microstructure was investigated using photography, optical microscopy and secondary electron microscopy. It was found that both laser mode and laser power show significant influence on grain structure. The CW mode generally leads to well-developed large columnar grains whereas the CW+PW mode tends to give rise to much finer equiaxed grains. Higher laser power was found to result in larger grains and coarser microstructure.


Original languageEnglish
Pages (from-to)104-108
Number of pages5
JournalMaterials Letters
Early online date12 May 2016
Publication statusPublished - 15 Sep 2016


  • Direct Laser Deposition, Laser Mode, Microstructure, Ti-6Al-4V