Additive manufacturing of metallic based on extrusion process: A review

An Overview of Surface Modification, A Way Toward Fabrication of Nascent Biomedical Ti-6Al-4V Alloys

Microstructure and mechanical properties of TC4 titanium alloy K-TIG welded joints

Magnetostrictive Fe-Ga alloys have received extensive attention for their good mechanical properties and low saturation magnetization. However, the magnetostriction of bulk polycrystalline Fe-Ga alloys always suffers a major setback due to random grain orientation. In this study, selective laser melting (SLM) was used for the first time to manufacture bulk polycrystalline Fe81Ga19 alloys, and different scanning paths were determined for revealing the influences on grain orientation and magnetostrictive properties. The results showed that elongated columnar grains formed in the building direction due to the epitaxial growth during SLM. For zigzag scanning, grain orientation was parallel to the building direction while tilted by ∼17° for unidirectional scanning. And annular scanning resulted in mixed grain orientations in the alloys. Moreover, Fe81Ga19 alloy with zigzag scanning exhibited 〈1 0 0〉 preferred grain orientation. Consequently, the saturated magnetostriction of bulk Fe81Ga19 alloy with zigzag scanning reached ∼77.2 ppm, representing 23.9% and 25.1% increments compared with unidirectional and annular scanning, respectively. The Fe81Ga19 alloy with zigzag scanning also presented an ultimate compressive strength of 448.6 MPa and a degradation rate of 0.09 mm/y, as well as favorable biocompatibility. These results indicated that SLM might be a potential method for manufacturing magnetostrictive bulk Fe-Ga alloys for implant applications. 

Magnetostrictive bulk Fe-Ga alloys prepared by selective laser melting for biodegradable implant applications

Additive manufacturing of titanium-based lattice structures for medical applications – A review

The tensile performance of Ti6Al4V alloy lattice structure was investigated. Firstly, a face center cubic unit cell with vertical struts (F2CCZ) lattice structure was designed. Then, the structures were fabricated by selective laser melting (SLM) with different aspect ratios. Subsequently, the SLM-ed alloys were subjected to double solution-aging to homogenize the microstructure and release residual stress. It is shown that there is only acicular α′ martensite with high dislocation density in the SLM-ed alloy, while the heat-treated alloy has α and β phases (there are multi-scale α laths and nano-scale β particles), and the orientation relationship between the two phases is: [113]β//[1210]α. The tensile strength of the HT-ed alloys presents a significant increase from 140 ± 18 MPa in the SLM-ed state to 229 ± 5.1 MPa with an aspect ratio of 4. It indicates that the special heat treatment regime can not only homogenize the microstructure of the SLM-ed alloy, but also improve the tensile strength.

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Multi-scale microstructure high-strength titanium alloy lattice structure manufactured via selective laser melting

In this study, nano-graphene reinforced titanium matrix composites (GNPs/Ti) with a honeycomb porous structure were fabricated by selective laser melting (SLM). The effects of graphene on the microstructure, mechanical properties and corrosion performance of the SLM GNPs/Ti were systematically investigated. Results of microstructure characterization show that: 1) the density of the SLM GNPs/Ti was improved as compared to that of the SLM Ti; 2) abundant TiC particles were formed in the SLM GNPs/Ti. The hardness and compressive strength of the composite increased by 90% (from HV 236 to HV 503) and 14% (from 277 MPa to 316 MPa), respectively, attributed to the uniformly distributed TiC and fine GNPs in the Ti matrix. Electrochemical tests reveal that the corrosion current density of the SLM GNPs/Ti is only 0.328 μA/cm2, that is about 25% less than that of the SLM Ti. The results indicate that the incorporation of nano-graphene is a potential method to strengthen the Ti by SLM.

Microstructure, mechanical properties and corrosion performance of selective laser melting Ti/GNPs composite with a porous structure

Ti–1Al–8V–5Fe (Ti-185) is a unique low-cost β-Ti alloy, containing lower cost alloying elements, notably Fe, as compared to Ti–10V–2Fe–3Al (Ti-1023) and Ti–5Al–5V–5Mo–3Cr (Ti-5553) while offering h...

A novel and high-strength Ti–Al–V–Fe alloy prepared by spark plasma sintering

The invention discloses an effective and controllable preparation method of a framework with a multi-polar hole structure. The preparation method specifically comprises the following steps of S1, reducing initial tungsten powder by flame spraying to prepare spherical aggregate tungsten powder; and S2, preparing a tungsten framework of the multi-polar hole structure from the spherical aggregate tungsten powder prepared in the S1 by adopting a discharge plasma sintering technique. The preparation method provided by the invention solves the problem of preparing the tungsten framework of the multi-polar hole structure in a process of preparing a copper-tungsten alloy by an infiltration sintering method.

Effective and controllable preparation method of framework with multi-polar hole structure

The invention discloses a preparing method for 3D printing of a low-cost high-strength titanium alloy part. The method comprises the following steps that firstly, pure titanium powder is subjected tomodification; secondly, the pure titanium powder modified in the first step and spherical pure titanium powder are mixed, and mixed powder is obtained; and thirdly, the mixed powder obtained in the second step is used for preparing the part with the deposition state through the selective laser melting technology. According to the preparing method, the problem that raw material powder for 3D printing of cheap medical and car parts is too high in cost, and the property is too low is solved.

Preparing method for 3D printing of low-cost high-strength titanium alloy part

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