The formation of solely β-phase titanium after direct laser deposition (DLD) of metastable β-Ti alloy does not provide the desired properties. Hence, we present a study into the ageing response of DLD built Ti-5553 β-Ti alloy to obtain the bimodal (β + α) microstructure providing improved properties. The results obtained from the heat treatments showed that a unique microstructure with refined intragranular and discontinuous grain boundary α-phase can be obtained by directly ageing (using fast heating rate) the as-built samples at the ageing condition (600 °C + 0.5 h). This microstructure produced a good balance in mechanical properties (UTS = 1345 ± 5 MPa and δ = 11.6 ± 0.5%). The interparticle spacing between the α-phase (d) showed a correlation with microhardness (Hv=340+158/√d) and yield stress (σ0.2=870+15086/√d) values for all the aged samples.
Bibliographical noteFunding Information:
MEF is grateful for funding from the Lloyd’s Register Foundation (LRF), UK a charitable foundation helping to protect life and property by supporting engineering-related education, public engagement and the application of research.
© 2021 Elsevier B.V.
- Direct laser deposition
- Microstructure-property relationship
- Single and duplex aging
- Titanium alloys
ASJC Scopus subject areas
- Biomedical Engineering
- Materials Science(all)
- Engineering (miscellaneous)
- Industrial and Manufacturing Engineering