Effect of Nb addition on mechanical properties and corrosion behavior of Ti6Al4V alloy produced by selective laser melti
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Effect of Nb addition on mechanical properties and corrosion behavior of Ti6Al4V alloy produced by selective laser melting Qingxuan Sui1, Lingtao Meng1, Shenghai Wang1,a), Peizhen Li1, Xiaotian Yin1, Li Wang1,b) 1
School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, People’s Republic of China Address all correspondence to these authors. e-mail: [email protected] b) e-mail: [email protected] a)
Received: 30 September 2019; accepted: 23 December 2019
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 (ep = 18.9 ± 1.8%) and high compressive strength (rc = 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 b grains are observed, which show a columnar shape and cellular shape. More importantly, the volume fraction of the b 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.
Introduction Selective laser melting (SLM), an emerging advanced manufacturing technology, has the ability to produce complex shaped three-dimensional metal parts by using a laser beam to selectively melt metal powders layer by layer [1]. SLM possesses several advantages over traditional production techniques, such as a near net-shape production without the need of expensive moulds, a high material use efficiency, a high level of flexibility, and the production of geometrically complex structural parts [2, 3, 4, 5, 6, 7, 8]. More importantly, because of the rapid heating and cooling process, the grain size prepared by SLM is much smaller than that prepared by traditional forging and casting, which leads to different mechanical properties, such as high strength [9]. Titanium alloys have attractive properties such as excellent combination of biocompatibility, corrosion resistance, and mechanical properties [10, 11]. Nowadays, Ti and its alloys are widely used in the marine, autoaviation, and space industries. Many research studies focus on the influence of
ª Materials Research Society 2020
process parameters or processing technologies on the microstructure and the mechanical properties of titanium parts produced by SLM [12, 13, 14, 15], as well as characterizing and improving their compr
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