Effect Of Manufacturing Parameters On The Performance Of 3D Printed Titanium Alloy Individualized Implants

3D printing technology is a leap forward in the development of modern manufacturing technology.It can print products directly,melt metal powder directly by laser or electron beam,accumulate metal layer by layer,and form metal parts directly.This technology can directly manufacture metal functional parts with complex structures,and can also produce biomedical implants to meet individual needs,and can meet the requirements of high-precision parts manufacturing and processing.It has the advantages of low cost,TC4 titanium alloy has excellent mechanical properties,corrosion resistance,non-magnetic,biocompatibility,high strength and good toughness.It is an ideal surgical implant material.it is very important to study the influence of manufacturing parameters on the properties of four sex-based implants of 3D printing TC4.The main contents of this paper are as follows:1.By X-ray diffraction analysis and metallographic,scanning electron microscopic and energy spectrum testing,the phase composition of the three-dimensional printed TC4titanium alloy was obtained.The microstructures of the specimens were observed under different laser power and scanning speed,and the effects of laser power and scanning speed on the tissue of the three-dimensional printed TC4 titanium alloy implants were obtained.2.Ansys finite element software was used to simulate the static force of the three-dimensional printed TC4 titanium alloy implants.At the same time,the hardness and tensile test of the three-dimensional printed TC4 titanium alloy specimens were carried out to explore the influence of printing parameters on the mechanical properties of dental implants.3.The effects of laser power and scanning speed on the corrosion properties of TC4titanium alloy dental implants were investigated by electrochemical etching and chemical etching.4.Through the above research,the optimum process parameters of 3D printing TC4titanium alloy implants were determined.The experimental results in this paper are as follows:1.Among the three-dimensional printed TC4 titanium alloy implant specimens studied,the optimum parameters of mechanical properties are:scanning speed 900mm/s laser power 275W;and the optimum parameters of corrosion performance are:scanning speed 900mm/s laser power 175W.2.Three-dimensional printing TC4 titanium alloy is a two-phase titanium alloy,including alpha'-Ti and beta-Ti.When the laser power increases from 175W to 275W,the main peak of the X-ray alpha'phase shifts to the right and the lattice constant decreases.When the laser power increases from 175W to 275W,the initial beta phase boundary of the fcc structure dissolves and the cluster alpha'phase increases,and when the scanning speed decreases from 1100mm/s to 900mm/s,the heating time is long,which easily leads to the increase of the alpha'phase.Acicular alpha'phase is an important strengthening phase in titanium alloy.3.The increase of laser power and the decrease of scanning speed can improve the hardness,tensile strength and elongation of 3D printed TC4 titanium alloy.When laser power increases from 175W to 275W and scanning speed decreases from 1000 mm/s to900 mm/s,the tensile strength of the sample increases from 336 MPa to 676 MPa,the elongation of the sample increases from 4.0%to 5.4%,and the average hardness of the sample increases from 354.43HV to 454.37HV.At the same time,it was found that the hardness value of the center zone of TC4 titanium alloy sample printed in 3D was higher than that of the two boundary areas.4.The numerical simulation of three-dimensional printed TC4 titanium alloy implants was carried out.The results were as follows:at 1000Pa,the implants did not undergo significant deformation;at 2000 Pa,the stress was mainly concentrated in the neck of the implants at 407.23 Pa,the stress distribution of the implants increased from 22.287 Pa to407.23 Pa,and the deformation increased from 3.445e-10m to 0.020488m.5.When the laser power and scanning speed decrease,the corrosion resistance of the three-dimensional printed TC4 titanium alloy implants can be improved.When the laser power decreases from 275W to 175W and the scanning speed decreases from 1100mm/s to900mm/s,the self-corrosion potential of the samples increases from-1.1223mv to-0.7437mv,the current density decreases from 9.987×10^-3Acm^-22 reduce to1.342×10^-5Acm^-2,and the corrosion rate decreases from 0.1151g/?m²h?to 0.0041g/?m²h?.