Effect of scanning strategy on microstructure and mechanical properties of a biocompatible Ti-35Nb-7Zr-5Ta alloy processed by laser-powder bed fusion

Author(s)

Batalha, Weverson Capute ; Batalha, Rodolfo Lisboa ; Kosiba, Konrad ; Kiminami, Claudio Shyinti ; Gargarella, Piter

• Document type: Journal article
• Source: Journal of Materials Research; v. N/A, p. 11-pg., 2022-10-04.

Abstract

The influence of scanning strategy (SS) on microstructure and mechanical properties of a Ti-35Nb-7Zr-5Ta alloy processed by laser-powder bed fusion (L-PBF) is investigated for the first time. Three SSs are considered: unidirectional-Y; bi-directional with 79 degrees rotation (R79); and chessboard (CHB). The SSs affect the type and distribution of pores. The highest relative densities and more homogeneous distribution of pores are obtained with R79 and CHB scanning strategies, whereas aligned pores are formed in the unidirectional-Y. The SSs show direct influence on the crystallographic texture with unidirectional-Y strategy showing fiber texture. The R79 strategy results in a weak texture and the CHB scanning strategy forms a randomly oriented heterogeneous grain structure. The lowest Young modulus is obtained with the unidirectional-Y strategy, whereas the R79 strategy results in the highest yield strength. It is shown that the SSs may be used for tuning the microstructure of a beta-Ti alloy in L-PBF. (AU)

• FAPESP's process: 17/27031-4 - Effect of process parameters on the metallurgical characteristics of additive-manufactured alloys
• Grantee: Piter Gargarella
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys
• Grantee: Claudio Shyinti Kiminami
• Support Opportunities: Research Projects - Thematic Grants