Enhanced biomechanical performance of additively manufactured Ti-6Al-4V bone plates
Article
Article Title | Enhanced biomechanical performance of additively manufactured Ti-6Al-4V bone plates |
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ERA Journal ID | 44865 |
Article Category | Article |
Authors | Gupta, Saurabh Kumar, Shahidsha, Nagur, Bahl, Sumit, Kedaria, Dhaval, Singamneni, Sarat, Yarlagadda, Prasad K.D.V., Suwas, Satyam and Chatterjee, Kaushik |
Journal Title | Journal of The Mechanical Behavior of Biomedical Materials |
Journal Citation | 119 |
Article Number | 104552 |
Number of Pages | 13 |
Year | 2021 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 1751-6161 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jmbbm.2021.104552 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S1751616121002356 |
Abstract | As the global trauma fixation devices market expands rapidly, it is imperative to improve the production of fixation devices through enhanced design accuracy and fit for best performance and maximum patient comfort. Selective laser melting (SLM) is one of the mature additive manufacturing methods, which provides a viable route for the rapid production of such devices. In this work, the ability of SLM to produce near-net-shape parts, as desired for medical implants, was utilized for the fabrication of bone plates from Ti-6Al-4V alloy powder. Martensitic microstructure obtained after the printing of alloy resulted in poor ductility, limiting its application in the field of orthopedics. A specially designed repeated cyclic heating and cooling close to but below the β-transus was used to transform from acicular to a bimodal microstructure without the need for plastic deformation prior to heat treatment for improving the ductility. Bone plates subjected to this heat treatment were mechanically tested by means of tensile and 3-point bend tests and demonstrated large improvement in ductility, and the values were comparable to those similar plates prepared from wrought alloy. Other important properties required for implants were assessed, such as corrosion resistance in simulated body fluid and cytocompatibility in vitro using MC3T3-E1 cells. These results for the bone plate after heat treatment were excellent and similar to those of the additively manufactured and wrought plates. Taken together, the performance of the additively manufactured bone plates after subjecting to heat treatment was similar to those of bone plate manufactured using wrought alloy. These results have important implications for the fabrication of patient-specific metallic orthopedic devices using SLM without compromising their biomechanical performance by subjecting them to a tailored heat treatment. |
Keywords | Bone plate; Ti-6Al-4V alloy; Selective laser melting; Microstructure; Mechanical properties; Heat treatment |
ANZSRC Field of Research 2020 | 4003. Biomedical engineering |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Indian Institute of Science, India |
Auckland University of Technology, New Zealand | |
Queensland University of Technology |
https://research.usq.edu.au/item/y1861/enhanced-biomechanical-performance-of-additively-manufactured-ti-6al-4v-bone-plates
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