Study on surface shape control of pure Ti fabricated by electron beam melting using electrolytic polishing

Jung, Jae‐Hyun; Park, Hyung-Ki; Lee, Byoung Soo; Choi, Jaeho; Seo, Bosung; Kim, Chan Yun

doi:10.1016/j.surfcoat.2017.05.061

Cited by 31 publications

(8 citation statements)

References 17 publications

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“…The main polishing methods of titanium alloys are mechanical polishing, electrolytic polishing, abrasive flow polishing, chemical mechanical polishing, ion beam polishing, high energy beam polishing and so on. The surface characteristics of commercially pure titanium parts fabricated by electron beam melting polished by the electrolytic polishing process was studied and the surface quality of commercially pure titanium parts was improved by the electrolytic polishing [ 11 ]. The effectiveness of various polishing processes based on chemical, mechanical and electrochemical were investigated to establish the effective methods for smooth Ti surface preparation before anodization.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Ultra-Precision Polishing of Ti-6Al-4V by Ultraviolet-Induced Nanoparticle Colloid Jet Machining

Song

Wang

et al. 2021

Materials

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Ti-6Al-4V is widely used in various fields of modern industry, but it is difficult to obtain an ultra-smooth surface of Ti-6Al-4V due to its poor machinability. In this article, ultraviolet-induced (UV-induced) nanoparticle colloid jet machining was utilized to carry out ultra-precision polishing of Ti-6Al-4V to improve the surface quality. The results of infrared differential spectroscopy before and after polishing show that new chemical bonds such as Ti-O-Ti (Al-O-Ti and V-O-Ti) appear on the Ti-6Al-4V workpiece surface, which indicates that the material of Ti-6Al-4V workpiece is removed through the chemical interaction between TiO2 nanoparticles and workpiece surface in the process of UV-induced nanoparticle colloid jet machining. The comparison of metallographic structure of Ti-6Al-4V before and after polishing shows that the chemical activity and material removal rate of the primary α phase in Ti-6Al-4V is higher than that of the remnant β phase in UV-induced nanoparticle colloid jet machining, which lead to the well-distributed nano-scale surface peaks and valleys at regular intervals on the polished Ti-6Al-4V workpiece surface. After polishing, the longitudinal residual stress on the surface of Ti-6Al-4V workpiece decreases from 75 MPa to 67 MPa and the transverse stress decreases from 13 MPa to 3 MPa. The surface roughness of Ti-6Al-4V workpiece is reduced from Sa 76.7 nm to Sa 2.87 nm by UV-induced nanoparticle colloid jet machining.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Ultra-Precision Polishing of Ti-6Al-4V by Ultraviolet-Induced Nanoparticle Colloid Jet Machining

Song

Wang

et al. 2021

Materials

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“…This study aimed to assess MRSP biofilm growth on different surface finishes of LPBF orthopedic implant metals to help understand the role that surface finish may play in an implant-associated SSI. The implant surface following LPBF is rough due to laser heat diffusion, which causes propagation of powder bonding beyond the area exposed to the laser [22,23]. This phenomenon makes smooth surfaces and corners difficult to manufacture without post-processing modifications [22], and facilitates biofilm adherence [24].…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon makes smooth surfaces and corners difficult to manufacture without post-processing modifications [22], and facilitates biofilm adherence [24]. Therefore, tumbling, chemical and electrochemical polishing, blasting, electropolishing, lathe or microabrasive machining, laser polishing, plasma spraying, or manual polishing [25–27] may be employed to smooth the surface [23,28,29,30]. The objective of this study was to assess the role of surface finish, using manual polishing, on biofilm formation of three different LPBF metals.…”

Section: Introductionmentioning

confidence: 99%

Manual polishing of 3D printed metals produced by laser powder bed fusion reduces biofilm formation

et al. 2019

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Certain 3D printed metals and surface finishes may be better suited for canine patient specific orthopedic implants on the basis of minimizing potential bacterial biofilm growth. Thirty disks each of titanium alloy, stainless steel, and cobalt chromium alloy were 3D printed via laser powder bed fusion. Fifteen disks of each metal were subsequently polished. After incubation with a robust biofilm-forming methicillin-resistant Staphylococcus pseudintermedius isolate, disks were rinsed and sonicated to collect biofilm bacteria. Serial dilutions were plated on blood agar, and colony forming units were counted log (ln) transformed for analysis of variance. Interference microscopy quantified surface roughness for comparison to biofilm growth. Scanning electron microscopy on both pre- and post-sonicated disks confirmed biofilm presence and subsequent removal, and visualized surface features on cleaned disks. Significantly more bacteria grew on rough versus polished metal preparations (p < 0.0001). Titanium alloy had more bacterial biofilm growth compared to cobalt chromium alloy (p = 0.0001) and stainless steel (p < 0.0001). There were no significant growth differences between cobalt chromium alloy and stainless steel (p = 0.4737). Relationships between biofilm growth and surface roughness varied: positive with the rough preparations and negative with the smooth. Polished preparations had increased variance in surface roughness compared to rough preparations, and within disk variance predominated over between disk variance for all preparations with the exception of rough cobalt chromium alloy and rough stainless steel. Using scanning electron microscopy, bacterial biofilms tended to form in crevices. Overall, manual polishing of 3D printed surfaces significantly reduced biofilm growth, with preparation-specific relationships between surface roughness and biofilm growth. These results suggest that metallic implants produced by laser powder bed fusion should be polished. Further research will elucidate the optimal surface roughness per preparation to reduce potential biofilm formation and implant associated infection.

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“…12, 2019 https://doi.org/10.1007/s11837-019-03795-z microstructures with shorter lead times and raw material consumption. [26][27][28][29][30][31][32][33][34][35][36][37] To date, nanoparticles have been used in the AM process. 38,39 Their decrease in size results in different characteristics from their bulk counterparts and changes the atomic packing as well as yielding a temperature effect.…”

Section: Introductionmentioning

confidence: 99%

Packing Changes in Melting, Freezing, and Coalescence of Titanium Nanoparticles from Atomic Simulations

Zhang

Wang

2019

JOM

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Atomic simulations by using an embedded-atom-method potential were used to study changes of packing patterns in melting, freezing, and coalescence of titanium particles that contained tens to thousands of atoms. The packing evolution under dynamics processes leads to shape fluctuations. Small particles prefer icosahedron configurations. Large particles undergo hexagonal close-packed (HCP)-body-centered cubic (BCC) and BCC-melt transitions in a heating-cooling cycle. Calculations of specific heat are higher than those predicted from the classical Dulong-Petit law. Upon cooling, the hysteresis transition temperatures depend on the particle size and surface morphologies. The connection at room temperature results from contact and deformation between near facets of two particles. Complex facets exist after coalescence. A single-domain structure occurs for the coalescence of two relatively small particles. The occurrence accompanies the HCP-BCC transition, and the melting temperature is improved. In these large particles, coalescence particles consist of domains before melting.

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Study on surface shape control of pure Ti fabricated by electron beam melting using electrolytic polishing

Cited by 31 publications

References 17 publications

Experimental Study on Ultra-Precision Polishing of Ti-6Al-4V by Ultraviolet-Induced Nanoparticle Colloid Jet Machining

Experimental Study on Ultra-Precision Polishing of Ti-6Al-4V by Ultraviolet-Induced Nanoparticle Colloid Jet Machining

Manual polishing of 3D printed metals produced by laser powder bed fusion reduces biofilm formation

Packing Changes in Melting, Freezing, and Coalescence of Titanium Nanoparticles from Atomic Simulations

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