中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 2 February 2026 |
（a School of Materials Science and Engineering, Central South University, Changsha 410083, China;
b State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China）
Abstract:Laser remelting (LR) was used as an auxiliary post-treatment process for the Ti6Al4V titanium alloys fabricated by laser powder bed fusion (LPBF). Optical microscope (OM), scanning electron microscope (SEM) and electron back scattering diffraction (EBSD) observations showed that the grains in melted zone (MZ) transformed into equiaxial grains with an average size of 1.31 μm, and the grains in heat affected zone (HAZ) were refined. Moreover, the texture intensity dropped significantly from 13.86 to 6.35 in MZ and 10.79 in HAZ. The temperature gradient (G) to solidification rate (R) ratio decreased when the laser scanning speed slowed down to a certain extent in the LR process, which effectively improved the highly preferred orientation and filled the hole defects in the surface of LPBF-Ti6Al4V. Furthermore, the hardness, wear resistance and corrosion resistance of the surface of the LPBF samples were improved by LR treatment.
Key words: laser powder bed fusion; laser remelting; grain refinement; preferred orientation; wear behavior; electrochemical properties; Ti6Al4V
