Conway_Borgman2021_Article_TheEffectOfEnergyDensityAndNbC.pdf (4.12 MB)
The effect of energy density and Nb content on the microstructure and mechanical properties of selective laser melted Ti-(10-30 wt.%) Nb
journal contribution
posted on 2021-10-05, 10:22 authored by James Borgman, Jing Wang, Lorenzo Zani, Paul ConwayPaul Conway, Carmen TorresCarmen TorresIn this study, Ti-(0-30 wt.%)Nb alloys developed from elemental powders were fabricated by the Selective Laser Melting (SLM) process. Compositional homogeneity, microstructure and mechanical performance were investigated as a function of energy density. The proportion of un-melted Nb particles and isolated pore count reduced with increasing energy density, while Ti allotropic content (i.e. α’, α” and β) varied with energy density due to in-situ alloying. Increasing the Nb content led to the stabilisation of the α” and β phases. The mechanical properties were similar to those compositions manufactured using casting methods, without further post processing. The addition of 20Nb (wt.%) and using an energy density of 230 J/mm3 resulted in a Young’s Modulus of 65.2 ± 1.8 GPa, a yield strength of 769 ± 36 MPa and a microstructure of predominantly α” martensite. This strength to stiffness ratio (33% higher than Ti-10Nb and 22% higher than Ti-30Nb), is attributed to in-situ alloying that promotes solid solution strengthening and homogenisation. These alloys are strong contenders as materials suitable for implantable load-bearing orthopaedic applications.
Funding
Embedded Integrated Intelligent Systems for Manufacturing
Engineering and Physical Sciences Research Council
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School
- Mechanical, Electrical and Manufacturing Engineering
Published in
Journal of Materials Engineering and PerformanceVolume
30Pages
8771-8783Publisher
SpringerVersion
- VoR (Version of Record)
Rights holder
© The AuthorsPublisher statement
This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/Acceptance date
2021-09-03Publication date
2021-09-20Copyright date
2021ISSN
1059-9495eISSN
1544-1024Publisher version
Language
- en
Depositor
Dr Carmen Torres-Sanchez. Deposit date: 3 September 2021Usage metrics
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