Effect of Post‐Deposition Thermal Treatments on Tensile Properties of Cold Sprayed Ti6Al4V

Dibakor Boruah; Xiang Zhang; Philip  McNutt; Raja  Khan; Henry  Begg

doi:10.3390/met12111908

Effect of Post‐Deposition Thermal Treatments on Tensile Properties of Cold Sprayed Ti6Al4V

Dibakor Boruah, Xiang Zhang, Philip McNutt, Raja Khan, Henry Begg

Centre for Manufacturing and Materials

The Welding Institute (TWI)

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

7 Citations (Scopus)

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Abstract

This study aims at investigating the effect of various post‐deposition thermal treatments on improving tensile properties of cold spray (CS) deposited titanium alloy Ti6Al4V. Dogbone shaped tensile specimens were designed considering two application scenarios: ‘fully CS’ specimens, and ‘CS repair’ specimens. For both specimen types, tests were carried out in four conditions: (i) as‐deposited (AD), and after three different thermal treatments, i.e., (ii) solution treatment and
ageing (STA), (iii) hot isostatic pressing (HIP), and (iv) HIP followed by STA (HIP + STA). Complementary to tensile testing, characterisation of CS deposited material was also carried out in terms of microstructure and hardness. The STA process resulted in the highest improvement in ultimate tensile strength by more than 200%, reaching 868 MPa for ‘fully CS’ and 951 MPa for ‘CS repair’ specimens. However, no appreciable improvement in elongation at failure was achieved, highest being 1.2% for ‘fully CS’ after STA, and 4.3% for ‘CS repair’ after HIP. In addition to experimental investigation, a comprehensive collection of data from the open literature on the effect of various thermal treatments on improving the tensile properties of CS Ti6Al4V deposits is reported and discussed.

Original language	English
Article number	1908
Number of pages	15
Journal	Metals
Volume	12
Issue number	11
DOIs	https://doi.org/10.3390/met12111908
Publication status	Published - 7 Nov 2022

Bibliographical note

This article is an open access article distributed under the terms and
conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

Funding

This research was enabled through and undertaken at the National Structural Integrity Research Centre, a postgraduate engineering facility for industry-led research into structural integrity established and managed by TWI Ltd. This work was sponsored by the Lloyd’s Register Foundation, a charitable organization that helps to protect life and property by supporting engineering-related education, public engagement and the application of research. Authors would like to thank Matthew Dore from TWI Ltd. and Abdul Khadar Syed from Coventry University for their support in various phases of this project. This work was supported by Lloyd’s Register Foundation under the Grant number DB012017COV; and Coventry University under the grant number 7486157.

Funders	Funder number
Lloyd’s Register Foundation	DB012017COV
Coventry University	7486157

Keywords

additive manufacturing
cold spray
repair
Ti6Al4V
thermal treatments
tensile properties

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Cite this

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abstract = "This study aims at investigating the effect of various post‐deposition thermal treatments on improving tensile properties of cold spray (CS) deposited titanium alloy Ti6Al4V. Dogbone shaped tensile specimens were designed considering two application scenarios: {\textquoteleft}fully CS{\textquoteright} specimens, and {\textquoteleft}CS repair{\textquoteright} specimens. For both specimen types, tests were carried out in four conditions: (i) as‐deposited (AD), and after three different thermal treatments, i.e., (ii) solution treatment andageing (STA), (iii) hot isostatic pressing (HIP), and (iv) HIP followed by STA (HIP + STA). Complementary to tensile testing, characterisation of CS deposited material was also carried out in terms of microstructure and hardness. The STA process resulted in the highest improvement in ultimate tensile strength by more than 200%, reaching 868 MPa for {\textquoteleft}fully CS{\textquoteright} and 951 MPa for {\textquoteleft}CS repair{\textquoteright} specimens. However, no appreciable improvement in elongation at failure was achieved, highest being 1.2% for {\textquoteleft}fully CS{\textquoteright} after STA, and 4.3% for {\textquoteleft}CS repair{\textquoteright} after HIP. In addition to experimental investigation, a comprehensive collection of data from the open literature on the effect of various thermal treatments on improving the tensile properties of CS Ti6Al4V deposits is reported and discussed.",

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Effect of Post‐Deposition Thermal Treatments on Tensile Properties of Cold Sprayed Ti6Al4V

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