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Additive manufacturing of Ti-6Al-4V with added boron: Microstructure and hardness modification

Titanium alloy composites with titanium boride (TiB) discontinuous reinforcement have shown improved performance in terms of strength, stiffness, and hardness. Producing this composite through selective laser melting (SLM) can combine the advantages of freeform design with the ability to produce TiB reinforcement in-situ. In this study, SLM was used to consolidate a pre-alloyed Ti-6Al-4V (Ti64) and amorphous boron (B) powder mixture with the intent of producing 1.5wt% TiB reinforcement in a Ti64 matrix. The processing parameters of laser power and scanning speed were investigated for their effect on the density, microstructures, and hardness of the composite material. The results showed that the boron and Ti64 composite could achieve a density greater than 99.4%. Furthermore, it was found that processing parameters changed the microstructural features of the material. The higher the energy density employed the more homogenous the distribution of boron modified material. Macro features were also observed with laser paths being clearly evident in the subsurface microstructure. Micro-hardness testing and density measurement also showed a corresponding increase with increasing energy density. Maximum hardness of 392.4HV was achieved in the composite compared to 354.2HV in SLM fabricated Ti64.
Journal Article
Type of thesis
Jackson, B., Torrens, R., Bolzoni, L., Yang, F., Fry, M., & Mukhtar, A. (2018). Additive manufacturing of Ti-6Al-4V with added boron: Microstructure and hardness modification. Key Engineering Materials, 770, 165–173. https://doi.org/10.4028/www.scientific.net/KEM.770.165
Trans Tech Publications
This is an author’s accepted version of an article published in the journal: Key Engineering Materials. © 2018 Trans Tech Publications, Switzerland.