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Microstructure and mechanical properties of B modified Ti–Fe alloy manufactured by casting, forging and laser melting deposition

Authors :
Guoqing Dai
Zhonggang Sun
Yanhua Guo
Hui Chang
Zhenhua Dan
Yuecheng Dong
Zhou Lian
Igor V. Alexandrov
Jingzhe Niu
Source :
Composites Part B: Engineering. 216:108854
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

Titanium alloys manufactured via additive manufacturing are suffering from coarse columnar grains due to the insufficient spontaneous nucleation rate during solidification. In this study, a newly designed Ti–2Fe-0.1B alloy with higher nucleating agent were introduced and manufactured by laser melting deposition method. The manufactured part is presenting a fully equiaxed grain morphology with 779 MPa on ultimate tensile strength. In order to reveal the mechanism of equiaxed grain formation and its influence on mechanical properties, a comprehensive study of microstructure evolution was carried out on Ti–2Fe-0.1B alloy manufactured via casting, forging and laser melting deposition. The results indicate that cooling speed are playing an important role on TiB morphology and Ti–2Fe-0.1B grain size simultaneously. The TiB formed from fast cooling speed are presenting a 3D quasi-network structure and improves the ultimate tensile strength of laser melting deposited part by 1.7 and 1.5 times when compared with casting and forging parts correspondingly. The study reveals that B addition is a sufficient method to control equiaxed grain formation in additive manufacturing of Ti–Fe alloy and promotes B addition as grain morphology controlling method in other additive manufactured titanium alloys in future.

Details

ISSN :
13598368
Volume :
216
Database :
OpenAIRE
Journal :
Composites Part B: Engineering
Accession number :
edsair.doi...........64a02ad1285f6130bb46180f264cd3b1