Refined microstructure and ultrahigh mechanical strength of (TiN + TiB)/Ti composites in situ synthesized via laser powder bed fusion

Boyuan Li; Changjun Han; Priyanka Vivegananthan; Devesh Raju Kripalani; Yujia Tian; Paulo Jorge Da Silva Bartolo; Kun Zhou

Additive Manufacturing Letters (Dec 2022)

Refined microstructure and ultrahigh mechanical strength of (TiN + TiB)/Ti composites in situ synthesized via laser powder bed fusion

Boyuan Li,
Changjun Han,
Priyanka Vivegananthan,
Devesh Raju Kripalani,
Yujia Tian,
Paulo Jorge Da Silva Bartolo,
Kun Zhou

Affiliations

Boyuan Li: Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Changjun Han: School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
Priyanka Vivegananthan: Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Devesh Raju Kripalani: Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Yujia Tian: Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
Paulo Jorge Da Silva Bartolo: Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Corresponding authors.
Kun Zhou: Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Corresponding authors.

Journal volume & issue: Vol. 3
p. 100082

Abstract

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Titanium matrix composites reinforced by titanium nitride (TiN) and titanium boride (TiB) were in situ synthesized via laser powder bed fusion (L-PBF) using premixed boron nitride (BN) and titanium powders. The optimal BN content was determined as 0.5 wt%, and a near-full density was achieved with optimized process parameters. The microstructure of the printed composite consisted of α-Ti matrix doped with N, as well as nano-sized TiN and TiB precipitates. The ultimate tensile strength of the printed composite sample was enhanced by ∼85% from ∼590 MPa to ∼1100 MPa as compared with the pure Ti counterpart, whereas the elongation was reduced to ∼3%. This research provides insights into the additive manufacturing of metal composites with near-full density and enhanced mechanical strength.

Published in Additive Manufacturing Letters

ISSN: 2772-3690 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Technology (General): Industrial engineering. Management engineering
Website: https://www.journals.elsevier.com/additive-manufacturing-letters/

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