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Effect of Nb addition on mechanical properties and corrosion behavior of Ti6Al4V alloy produced by selective laser melting

Published online by Cambridge University Press:  10 February 2020

Qingxuan Sui ,
Lingtao Meng ,
Shenghai Wang ,
Peizhen Li ,
Xiaotian Yin  and
Li Wang
Qingxuan Sui
Affiliation:
School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, People's Republic of China
Lingtao Meng
Affiliation:
School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, People's Republic of China
Shenghai Wang*
Affiliation:
School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, People's Republic of China
Peizhen Li
Affiliation:
School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, People's Republic of China
Xiaotian Yin
Affiliation:
School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, People's Republic of China
Li Wang*
Affiliation:
School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: shenghaiw@163.com
b)e-mail: wanglihxf@126.com
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Abstract

In this research, a novel titanium metallic composite, Ti6Al4V powder mixed with 5 at.% Nb powder, was fabricated by selective laser melting (SLM). The effect of Nb addition on their phase transformation, microstructure evolution, mechanical properties, and corrosion behavior were studied. Interestingly, the novel alloy shows a combination of superior plastic deformation (εp= 18.9 ± 1.8%) and high compressive strength (σc= 1593 ± 38 MPa), which is 60.2 and 3.2% higher than that of the SLM-processed Ti6Al4V alloy under optimum printing parameters, respectively. However, the yield strength of Ti6Al4V + 5Nb (973 ± 45 MPa) is lower than that of the Ti6Al4V alloy (1066 ± 12 MPa). The solidification mechanism changes from planar to cellular mode with Nb addition. The ultrafine microstructure β grains are observed, which show a columnar shape and cellular shape. More importantly, the volume fraction of the β phase is significantly increased from 3.7% to 20.4% because of the Nb addition. In addition, the Ti6Al4V + 5Nb alloy possesses better corrosion resistance than the Ti6Al4V alloy. The research highlights that the addition of Nb powder in Ti6Al4V processed by SLM can improve the mechanical properties and corrosion resistance of the material.

Keywords

laserNballoy
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 6 , 30 March 2020 , pp. 571 - 579
Copyright
Copyright © Materials Research Society 2020

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