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figure 12 shows the fatigue performance of the slm manufactured titanium parts obtained by astm b543.4 test. as indicated by the curves, the fatigue life decreases with an increase in fatigue frequency, where the decreasing rate is 2.8% and 6.9% for the slm manufactured titanium part fabricated at l&s and sx, respectively. at the start of the test, the fatigue life of both parts is more or less the same, and no obvious increase of crack can be found in the slm manufactured titanium parts. as the fatigue test proceeds, cracks are formed near the surface of the titanium part (l&s fabricated titanium part in fig. 12 ), and the crack content at the end of the fatigue test is slightly higher in the l&s fabricated titanium part than the sx fabricated titanium part (fig. 13 ). at the end of fatigue test, both fatigue life and the severity of the cracks are observed to be different for the slm manufactured titanium part fabricated at l&s and sx. although the fatigue test is carried out at a lower temperature, the nature of the defect development in the titanium parts is different. besides, with the extension of the slm fabrication time, more defects and cracks can be found in the interior of the titanium part, and the cracks formed are more severe in the part fabricated at l&s. for the slm manufactured titanium part, more defects and cracks can be found in the interior with the increasing slm fabrication time. as a whole, the fatigue life of the slm manufactured titanium parts is lower than the one produced by ebm at near-room temperature, especially when the slm fabrication time is longer. therefore, the slm manufactured titanium parts are not reliable. this is due to the non-uniform thermal stress distribution in the slm fabricated titanium parts, and the thermal stress is increased at the surface and decreased at the interior with the increasing slm fabrication time, which eventually leads to the degradation of the fatigue life of the titanium part. therefore, the design of the slm fabricated titanium part should consider the fatigue performance during the manufacturing process. in addition, the fatigue life of the slm fabricated titanium parts is comparable with the one produced by ebm at low temperature (below 1138k).
for a large-scale r&d program to be successful, it is paramount that a product manufacturing technology is demonstrated as adequate and reliable. therefore, the technology must be demonstrated as stable and repeatable in a reproducible manner. in this work, the slm ti-6al-4v (t6v4) parts are fabricated through inductively coupled plasma (icp) technique. after fabricating the parts, the inspected specimens are machined and the tensile tests are conducted to investigate the mechanical properties of the fabricated t6v4 parts. the surface is also characterized using raman spectroscopy. the laser induced breakdown spectroscopy (libs) technique is adopted to examine the impurities of the slm fabricated t6v4 parts, and also to analyze the microstructure. finally, the tensile tests of the fabricated t6v4 parts are investigated, and the surface mechanical properties are also characterized using a nano-level surface analysis. furthermore, due to the great importance of the microstructure on the mechanical properties of the parts, the fractal parameters of the structures are also quantitatively determined.
results show that no obvious increase of porosity and cracks is found in the slm manufactured titanium parts fabricated at l&s design condition. however, with the extension of slm fabrication time, the increase of cracks and porosity can be observed. the probability of defect and cracks formation in the fabricated titanium parts with the increasing slm fabrication time is studied in ref. [ 65 ]. their results indicate that the process time has a great effect on the defect formation and also the range of defects formed is different from the one formed in the slm manufactured nickel-based superalloy with similar energy density. for the titanium part that is fabricated at l&s, the larger slm fabrication time causes a small amount of pores and small cracks around the surface, while more porosity and cracks can be found in the interior of the part. for the same kind of titanium part, when the energy density is increased, more defects can be observed in the interior of the part. besides, the critical defect content that is necessary to crack initiation in the titanium part is lower than that of the nickel-based superalloy part. the larger critical defect content makes the titanium part more prone to crack initiation during slm manufacturing.
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