增材制造NiTi合金支架组织性能研究

doi:10.6040/j.issn.1671-7554.0.2022.1421

摘要/Abstract

摘要： 目的揭示工艺参数以及结构特征对激光粉末床熔融(L-PBF)制备的NiTi合金多孔支架组织性能的影响规律及机制,为制备高性能NiTi合金骨植入体提供基础。方法采用L-PBF工艺制备两组体心立方结构的多孔支架:(1)保持支架杆径200 μm不变,改变激光扫描速度500~1 000 mm/s,以研究激光扫描速度的影响;(2)保持L-PBF工艺参数不变,改变支架杆径150~500 μm,以研究结构特征的影响。采用扫描电子显微镜、差示扫描量热仪、力学试验机等方法研究NiTi合金多孔支架的显微组织、相变行为及力学性能。结果随激光扫描速度增加,支架的实际杆径减小,马氏体相变温度降低,压缩应力下降,循环压缩过程中可回复应变增加;随支架杆径增大,马氏体相变温度升高,循环压缩过程中的可回复应变减小,表现出明显的尺寸效应。结论 L-PBF工艺参数及尺寸效应均会影响NiTi合金支架的组织与性能,为了制备符合预期性能的复杂NiTi合金骨植入体,需要根据不同部位的特征尺寸,优化L-PBF工艺参数。

关键词: 增材制造, 激光粉末床熔融, NiTi合金, 骨植入体, 尺寸效应, 多孔支架

Abstract: Objective To explore the effects of process parameters and feature sizes on the microstructure and properties of NiTi alloy scaffolds fabricated with laser powder bed fusion(L-PBF), so as to provide reference for the fabrication of NiTi alloy orthopaedic implants. Methods The following two groups of NiTi alloy scaffolds with body-centered cubic structure were fabricated: (1) NiTi scaffolds fabricated with different laser scanning speeds of 500-1 000 mm/s, while the beam size was fixed at 200 μm, to investigate the effects of L-PBF process parameters; (2) NiTi scaffolds with different struct sizes of 150-500 μm fabricated with the same L-PBF process parameters, to investigate the size effects. The microstructure, phase transformation behavior and mechanical properties of NiTi scaffolds were examined with scanning electron microscope, differential scanning calorimeter and mechanical testing machine. Results The actual struct size, the martensite transformation temperatures, and the compression strength decreased with the increase of laser scanning speed, while the recoverable strain during cycling compression tests increased with the decrease of scanning speed. The martensite transformation temperatures increased with the increase of the strut size, indicating a clear size effect. Conclusion Both the process parameters and feature size can affect the microstructure and properties of the L-PBF fabricated NiTi scaffolds. Therefore, in order to fabricate NiTi orthopaedic implants with predictable properties, the featured size at different locations has to be considered to optimize the L-PBF process conditions.

Key words: Additive manufacturing, Laser powder bed fusion, NiTi alloy, Orthopedic implant, Size effect, Scaffolds

中图分类号:

R687.1

张博,高娜,席瑞,王协彬. 增材制造NiTi合金支架组织性能研究[J]. 山东大学学报 (医学版), 2023, 61(3): 63-70.

ZHANG Bo, GAO Na, XI Rui, WANG Xiebin. A study on the microstructure and properties of additively manufactured NiTi alloy scaffolds[J]. Journal of Shandong University (Health Sciences), 2023, 61(3): 63-70.

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