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Microstructure of Cross-Linked High Densification Network and Strengthening Mechanism in Cold-Sprayed Ti-6Al-4V Coating After Heat Treatment

Zhou, Hongxia; Li, Chengxin; Luo, Xiaotao; Yang, Guanjun; Hussain, Tanvir; Li, Changjiu

Microstructure of Cross-Linked High Densification Network and Strengthening Mechanism in Cold-Sprayed Ti-6Al-4V Coating After Heat Treatment Thumbnail


Authors

Hongxia Zhou

Chengxin Li

Xiaotao Luo

Guanjun Yang

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TANVIR HUSSAIN TANVIR.HUSSAIN@NOTTINGHAM.AC.UK
Professor of Coatings and Surface Engineering

Changjiu Li



Abstract

In this study, Ti-6Al-4V (TC4) coating was prepared using an in situ shot peening-assisted cold spraying technology in which large shot peening particles were mixed with TC4 spraying powders to prepare the deposit. To improve its strength and toughness, the coating was heat-treated at 600-1000 °C in vacuum. The results demonstrated that the microstructure of the as-sprayed coating exhibited a special structure that was denser at the regions tamped by the shot peening particles and porous at the nontamped regions. When the coating was heat-treated at 800 and 1000 °C, the interface between the particles had largely disappeared and the local pores had interconnected with each other due to thermal diffusion and recrystallization. The coating hardness decreased slightly after annealing at 600 and 800 °C due to the released strain hardening effect. The bonding strength of the coating after annealing improved in comparison with that of the as-sprayed coating. The tensile strength of the coating improved significantly under annealing at 800 °C. A cross-linked high densification network was formed after annealing due to the effect of in situ shot peening, which served as a reinforced framework and enhanced the strength of the coating.

Citation

Zhou, H., Li, C., Luo, X., Yang, G., Hussain, T., & Li, C. (2020). Microstructure of Cross-Linked High Densification Network and Strengthening Mechanism in Cold-Sprayed Ti-6Al-4V Coating After Heat Treatment. Journal of Thermal Spray Technology, 29(5), 1054-1069. https://doi.org/10.1007/s11666-020-01042-5

Journal Article Type Article
Acceptance Date Mar 28, 2020
Online Publication Date May 11, 2020
Publication Date 2020-06
Deposit Date Jun 25, 2020
Publicly Available Date Mar 28, 2024
Journal Journal of Thermal Spray Technology
Print ISSN 1059-9630
Electronic ISSN 1544-1016
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 29
Issue 5
Pages 1054-1069
DOI https://doi.org/10.1007/s11666-020-01042-5
Keywords Materials Chemistry; Surfaces, Coatings and Films; Condensed Matter Physics
Public URL https://nottingham-repository.worktribe.com/output/4709483
Publisher URL https://link.springer.com/article/10.1007/s11666-020-01042-5
Additional Information This is a post-peer-review, pre-copyedit version of an article published in Journal of Thermal Spray Technology . The final authenticated version is available online at: http://dx.doi.org/10.1007/s11666-020-01042-5

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