The ageing response of direct laser deposited metastable β-Ti alloy, Ti–5Al–5Mo–5V–3Cr

Deepak Sharma; Sitarama Raju Kada; Daniel Fabijanic; David Parfitt; Bo Chen; Bryan Roebuck; Michael E. Fitzpatrick; Matthew Robert Barnett

doi:10.1016/j.addma.2021.102384

The ageing response of direct laser deposited metastable β-Ti alloy, Ti–5Al–5Mo–5V–3Cr

Deepak Sharma, Sitarama Raju Kada, Daniel Fabijanic, David Parfitt, Bo Chen, Bryan Roebuck, Michael E. Fitzpatrick, Matthew Robert Barnett

Research output: Contribution to journal › Article › peer-review

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Abstract

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 (H_v=340+158/√d) and yield stress (σ_0.2=870+15086/√d) values for all the aged samples.

Original language	English
Article number	102384
Journal	Additive Manufacturing
Volume	48
Issue number	Part A
Early online date	4 Oct 2021
DOIs	https://doi.org/10.1016/j.addma.2021.102384
Publication status	Published - 1 Dec 2021

Bibliographical note

Funding 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.

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

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

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10.1016/j.addma.2021.102384

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abstract = "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.",

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AU - Parfitt, David

AU - Chen, Bo

AU - Roebuck, Bryan

AU - Fitzpatrick, Michael E.

AU - Barnett, Matthew Robert

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N2 - 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.

AB - 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.

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The ageing response of direct laser deposited metastable β-Ti alloy, Ti–5Al–5Mo–5V–3Cr

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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