Effect of Microstructure and Internal Defects on the Mechanical Properties of Ti6Al4V Gyroid Lattice Structures for Biomedical Implants
Selective laser melting (SLM) is a laser powder bed fusion (L-PBF) technique that can be used to print lattice structures with fine complicated features. Much effort has been made to choose a lattice design that enhances the mechanical and biological functions for biomedical implants. Triply periodi...
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| Published in | Structural Integrity of Additive Manufactured Materials and Parts pp. 271 - 288 |
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| Main Authors | , , |
| Format | Book Chapter |
| Language | English |
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| ISBN | 9780803177086 0803177089 |
| DOI | 10.1520/STP163120190125 |
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| Abstract | Selective laser melting (SLM) is a laser powder bed fusion (L-PBF) technique that can be used to print lattice structures with fine complicated features. Much effort has been made to choose a lattice design that enhances the mechanical and biological functions for biomedical implants. Triply periodic minimal surface (TPMS) lattice structures, namely gyroids, have shown a great potential to match the mechanical and biological properties of bone tissue. Although the design plays a major role in determining the properties of lattice structures, the effect of the SLM process on the lattice structure quality is often overlooked. This work focuses on the relationship between the resultant microstructure and the mechanical properties of Ti6Al4V gyroid lattice structures. Different process parameter combinations were used to develop a wide range of volumetric energy density (VED). The gyroid design was then printed at three VED levels: 43, 103, and 192 J/mm3. The apparent density, morphology, and internal defects were analyzed. Microcomputed tomography (microCT) was used for characterizing the morphology of the samples. The results showed that the apparent density was highly dependent on the VED level; the density of the parts printed with a VED of 192 J/mm3 was 150% higher than that of those printed with VED of 43 J/mm3. The percentage of internal defects ranged from 0.3 to 2.1% and was directly proportional to the VED level. The mechanical strength was more dependent on the overall density rather than the internal defects. Thus, parts printed at VED of 192 J/mm3 had an almost 200% higher apparent compressive modulus and peak strength compared to those printed at VED of 43 J/mm3. In addition, a finite element model has been developed using ABAQUS®. The numerical results were in good agreement with the experimental data and may be used to make predictions for different gyroid designs. |
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| AbstractList | Selective laser melting (SLM) is a laser powder bed fusion (L-PBF) technique that can be used to print lattice structures with fine complicated features. Much effort has been made to choose a lattice design that enhances the mechanical and biological functions for biomedical implants. Triply periodic minimal surface (TPMS) lattice structures, namely gyroids, have shown a great potential to match the mechanical and biological properties of bone tissue. Although the design plays a major role in determining the properties of lattice structures, the effect of the SLM process on the lattice structure quality is often overlooked. This work focuses on the relationship between the resultant microstructure and the mechanical properties of Ti6Al4V gyroid lattice structures. Different process parameter combinations were used to develop a wide range of volumetric energy density (VED). The gyroid design was then printed at three VED levels: 43, 103, and 192 J/mm3. The apparent density, morphology, and internal defects were analyzed. Microcomputed tomography (microCT) was used for characterizing the morphology of the samples. The results showed that the apparent density was highly dependent on the VED level; the density of the parts printed with a VED of 192 J/mm3 was 150% higher than that of those printed with VED of 43 J/mm3. The percentage of internal defects ranged from 0.3 to 2.1% and was directly proportional to the VED level. The mechanical strength was more dependent on the overall density rather than the internal defects. Thus, parts printed at VED of 192 J/mm3 had an almost 200% higher apparent compressive modulus and peak strength compared to those printed at VED of 43 J/mm3. In addition, a finite element model has been developed using ABAQUS®. The numerical results were in good agreement with the experimental data and may be used to make predictions for different gyroid designs. |
| Author | Mahmoud, Dalia Al-Rubaie, Kassim S. Elbestawi, Mohamed A. |
| Author_xml | – sequence: 1 givenname: Dalia orcidid: 0000-0002-4654-2273 surname: Mahmoud fullname: Mahmoud, Dalia organization: Mechanical Engineering, McMaster University – sequence: 2 givenname: Mohamed A. orcidid: 0000-0003-0982-6127 surname: Elbestawi fullname: Elbestawi, Mohamed A. organization: Mechanical Engineering, McMaster University – sequence: 3 givenname: Kassim S. orcidid: 0000-0003-4507-2852 surname: Al-Rubaie fullname: Al-Rubaie, Kassim S. organization: Mechanical Engineering, McMaster University |
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| ContentType | Book Chapter |
| Copyright | All rights reserved. This material may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of the publisher. 2020 ASTM International 2020 |
| Copyright_xml | – notice: All rights reserved. This material may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of the publisher. 2020 ASTM International – notice: 2020 |
| DOI | 10.1520/STP163120190125 |
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| Discipline | Engineering |
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| Notes | 2019-10-07 - 2019-10-10Fourth ASTM Symposium on Structural Integrity of Additive Manufactured Materials and PartsFort Washington, MD |
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| References_xml | – reference: VilaroT. , ColinC. , and BartoutJ. D. , “As-Fabricated and Heat-Treated Microstructures of the Ti-6Al-4V Alloy Processed by Selective Laser Melting,” Metallurgical and Materials Transactions A 42, no. 10 (2011), 3190–3199, https://doi.org/10.1007/s11661-011-0731-y – reference: CiuranaJ. , HernandezL. , and DelgadoJ. , “Energy Density Analysis on Single Tracks Formed by Selective Laser Melting with CoCrMo Powder Material,” The International Journal of Advanced Manufacturing Technology 6 8 (2013), 1103–1110, https://doi.org/10.1007/s00170-013-4902-4 – reference: ZhangL.-C. and ChenL.-Y. , “A Review on Biomedical Titanium Alloys: Recent Progress and Prospect,” Advanced Engineering Materials 21 (2019): 1801215–1801244, https://doi.org/10.1002/adem.201801215 – reference: Sallica-LevaE. , CaramR. , JardiniA. L. , and FogagnoloJ. 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| Snippet | Selective laser melting (SLM) is a laser powder bed fusion (L-PBF) technique that can be used to print lattice structures with fine complicated features. Much... |
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| StartPage | 271 |
| SubjectTerms | Finite Element Analysis Gyroids Internal Defects Lattice Structures Manufacturing Engineering Materials & Manufacturing Processes Mechanical Properties Selective Laser Melting |
| TableOfContents | 19.1 Introduction
Table 1. Chemical Composition of the Ti6Al4V Powder
19.2 Materials and Methods
19.3 Results and Discussion
19.4 Conclusions
Acknowledgments
References |
| Title | Effect of Microstructure and Internal Defects on the Mechanical Properties of Ti6Al4V Gyroid Lattice Structures for Biomedical Implants |
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