Optimization of Laser Powder Bed Fusion Process for Forming Porous Ta Scaffold

Author:

Gao Lin12,Wang Yikai12,Qin Xiao12,Lv Naixin12,Tong Zhiqiang12,Sun Changning12,Li Dichen12

Affiliation:

1. State Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710054, China

2. National Medical Products Administration (NMPA), Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices, Xi’an Jiaotong University, Xi’an 710054, China

Abstract

To improve the performance of porous tantalum (Ta) manufactured by laser powder bed fusion (L-PBF) and meet its application requirements in medicine, the authors of this paper studied the influence of L-PBF process parameters on the strut surface morphology and mechanical performance. It was found that the powder layer thickness had a significant influence on the microstructure and mechanical properties based on statistical analysis. We proposed optimal process parameters of laser power of 150 W, scanning speed of 270 mm/s, thickness of 0.05 mm, and scanning spacing of 0.07 mm. After parameter optimization, we successfully obtained Ta samples with an elastic modulus of 1.352 ± 0.007 GPa and yield strength of 53.217 ± 0.114 MPa. The results show that the elastic modulus and yield strength of porous Ta samples with a porosity of 80% under the optimal process parameters are significantly superior to previous studies. The porous Ta scaffolds with higher mechanical properties fabricated with the optimized process parameters of L-PBF have significant value for applications in medicine.

Funder

Key R&D Program of Ningxia Province

National Natural Science Foundation of China

University Joint Project of Shaanxi Province

Program for Innovation Team of Shaanxi Province

Publisher

MDPI AG

Subject

General Materials Science,Metals and Alloys

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