Abstract
Ti-6Al-4V alloys with different build orientations have been fabricated by selective laser melting (SLM). The corrosion behavior and mechanical properties have been studied. Investigation of microstructures were characterized by optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. Electrochemical results show that the vertical sample and horizontal sample possess excellent corrosion resistance in the cross section and longitudinal section respectively, which can be attributed to the presence of less acicular α′ martensite and more β phase. Mechanical properties of all samples were determined by compression testing and hardness measurements. The compression strength (σc) and plastic deformation (εp) of the horizontal sample were higher than those of the vertical sample and the sample with building direction of 45°, because the molten pool boundaries (MPBs) play a significant role in the microscopic slipping at the loading SLM parts. In addition, the sample with building orientation of 45° achieved highest hardness. Therefore, distinct anisotropy due to different build orientations.
Highlights
Titanium (Ti) alloys have attractive properties such as higher specific strength to weight ratio, super-plasticity, excellent biocompatibility, and better corrosion resistance
In order to investigate the effect of build orientation on the corrosion resistance and mechanical properties of selective laser melting (SLM)-produced samples, produced Ti-6Al-4V alloy is shown in Figure 3, the cube size is 20 × 10 × 10 mm for electrochemical measurements
Information obtained from the X-ray diffraction (XRD) and metallographic analysis reveals that the SLM-produced samples mainly consist of α0 -Ti phase and β-Ti phase, but with different volume fraction, leading to the difference in corrosion resistance
Summary
Titanium (Ti) alloys have attractive properties such as higher specific strength to weight ratio, super-plasticity, excellent biocompatibility, and better corrosion resistance. Ti and its alloys are becoming more and more important in the marine, auto, aviation, and space industries [1,2,3,4,5]. Ti-6Al-4V alloy has an excellent corrosion resistance due to the stable, passive oxide layer formed on its surface, so it is the one most widely used for many engineering components and bio-medical and dental implants due to its superb corrosion resistance [6,7,8,9,10,11,12]. Ti-6Al-4V is a duplex structured alloy which contains a hexagonal close packed (hcp). As is shown in previous studies [15,16,17], a wide range of microstructures of Ti-6Al-4V can be exhibited through different heat treatment conditions
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