首页|Understanding the effect of scanning strategies on the microstructure and crystallographic texture of Ti-6Al-4V alloy manufactured by laser powder bed fusion

Understanding the effect of scanning strategies on the microstructure and crystallographic texture of Ti-6Al-4V alloy manufactured by laser powder bed fusion

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  • NSTL
  • Elsevier
In this work, experimental and numerical approaches are performed to explore the influence of scanning strategies on the microstructure, crystallographic texture as well as the mechanical behavior of Ti-6Al-4V alloy manufactured by Laser Powder Bed Fusion (LPBF). In-situ monitored data of the energy intensity show that different scanning strategies result in variations of energy intensity distribution. The characterization of the microstructure and crystallographic texture reveals that the sample with hexagon scan pattern displays the structure with columnar primary 13 phase, while the specimens with chessboard scan exhibit equiaxial-like morphology. EBSD and TEM results provide evidence of the appearance of residual 13 nanoparticles. A finite element model is developed to further explain the phase transformation during LPBF and the formation mechanism of residual 13 particles. The numerical results indicate that the appearance of the residual 13 phase is attributed to the preheating/reheating effect by the adjacent tracks and successive layers, and the final phase composition of the LPBF-built Ti-6Al-4V alloy combines the alpha ', alpha, and 13 phases. Findings in the present paper show that various scanning strategies lead to a clear diversification in the microstructure, crystallographic texture, and phase composition of LPBF-built samples, which opens a route towards the tailoring of mechanical properties and isotropic behaviors in additive manufacturing.

Laser powder bed fusionTi-6Al-4V alloyScanning strategyCrystallographic textureThermal history

Liu, Jiangwei、Li, Guichuan、Sun, Qidong、Li, Hu、Sun, Jie、Wang, Xiebin

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Shandong Univ, Sch Energy & Power Engn, Jinan 250061, Peoples R China

Katholieke Univ Leuven, Dept Mat Engn, Kasteelpk Arenberg 44, B-3001 Heverlee, Belgium

Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mech Manufacture, Jinan 250061, Peoples R China

Shandong Univ, Sch Microelect, Shandong Technol Ctr Nanodevices & Integrat, Jinan 250101, Peoples R China

Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China

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2022

10.1016/j.jmatprotec.2021.117366

Journal of Materials Processing Technology

Journal of Materials Processing Technology

EISCI
ISSN：0924-0136
年,卷(期)：2022.299
  • 19
  • 34