Heat Treatment Degrading the Corrosion Resistance of Selective Laser Melted Ti-6Al-4V Alloy

Dai, Nianwei; Zhang, Junxi; Chen, Yang; Zhang, Lai-Chang

doi:10.1149/2.1481707jes

Cited by 119 publications

(83 citation statements)

References 46 publications

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“…As a result, the element Al is in a low valence state and the α phase is vulnerable to corrode. The potentiodynamic measurements indicate that the EBM as‐produced Ti–6Al–4V samples have more corrosion resistance than wrought samples due to a higher fraction of β phase and greatly refined lamellar α / β phases (Figure ) . It is noted that the EBM‐produced Ti–6Al–4V alloy has a microstructure composed of α and β phases; such a microstructure is totally different from the typical microstructure comprised of α ′ and β phases in the SLM‐produced Ti–6Al–4V .…”

Section: Ebm‐produced Titanium Alloysmentioning

confidence: 96%

“…It is noted that the EBM‐produced Ti–6Al–4V alloy has a microstructure composed of α and β phases; such a microstructure is totally different from the typical microstructure comprised of α ′ and β phases in the SLM‐produced Ti–6Al–4V . Due to the difference in the microstructures produced by EBM and SLM, the AM‐produced Ti–6Al–4V alloy has shown different corrosion behaviors compared to those for the traditional Grade 5 alloy …”

Section: Ebm‐produced Titanium Alloysmentioning

confidence: 99%

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Additive Manufacturing of Titanium Alloys by Electron Beam Melting: A Review

et al. 2017

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Electron beam melting (EBM), as one of metal additive manufacturing technologies, is considered to be an innovative industrial production technology. Based on the layer-wise manufacturing technique, as-produced parts can be fabricated on a powder bed using the 3D computational design method. Because the melting process takes place in a vacuum environment, EBM technology can produce parts with higher densities compared to selective laser melting (SLM), particularly when titanium alloy is used. The ability to produce higher quality parts using EBM technology is making EBM more competitive. After briefly introducing the EBM process and the processing factors involved, this paper reviews recent progress in the processing, microstructure, and properties of titanium alloys and their composites manufactured by EBM. The paper describes significant positive progress in EBM of all types of titanium in terms of solid bulk and porous structures including Ti-6Al-4V and Ti-24Nb-4Zr-8Sn, with a focus on manufacturing using EBM and the resultant unique microstructure and service properties (mechanical properties, fatigue behaviors, and corrosion resistance properties) of EBM-produced titanium alloys.

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Section: Ebm‐produced Titanium Alloysmentioning

confidence: 96%

Section: Ebm‐produced Titanium Alloysmentioning

confidence: 99%

Additive Manufacturing of Titanium Alloys by Electron Beam Melting: A Review

et al. 2017

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“…The two factors caused the decrease in corrosion resistance of the SLM sample. Dai et al[48] also confirmed that the grain size was another factor affecting corrosion resistance of the SLM samples. For this study, with the increase in content of Cr, the content in HCP presents the upward tendency (35 vol.%, 56 vol.% and 98 vol.% in volume fraction for Coating I, Coating II and Coating III), accompanied with the decrease in content of Ti 2 Ni (65 vol.%, 44 vol.% and 7 vol.%).…”

mentioning

confidence: 86%

Investigation into corrosion and wear behaviors of laser-clad coatings on Ti6Al4V

Zhang

Jiang

et al. 2020

Mater. Res. Express

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TiAlCoCr x FeNihigh-entropy alloys (HEAs) coatings were fabricated on the surface of Ti6Al4V by laser cladding. Their microstructural evolution with the increase in x value (x=0, x=1.0, x=2.0) was investigated in detail. Besides that, the investigation into the effects of the Cr content on their corrosion behaviors and mechanical properties (in terms of hardness and wear resistance) was also carried out comprehensively. The results indicated that two kinds of phases (a solid solution with thehexagonal close-packed (HCP) structureand Ti 2 Ni) were synthesized in the coatings, and the HCP content was gradually increased with the increase in x accompanied with the decrease in Ti 2 Ni content. A HEA coating only composed of single HCP was successfully prepared when x reached 2.0. The electrochemical and immersion tests all confirmed that the coating with x=2.0demonstrated the most excellent corrosion resistance in a0.1 mol·L −1 HCl solution from different aspects including corrosion tendency and corrosion rate without the applied potential, the formation difficult/stability of the passive film and the dissolution rate in the passive state, and corrosion surface morphology. The averagemicrohardness values of the coatings weregraduallyincreasedfrom 656HV 0.2 to 800 HV 0.2 with increasing xfrom 0 to 2.0, which wereabout double that of the substrate (350 HV 0.2 ). Wear resistance of the coatings also exhibited the upward tendency with increasing the x values (0.562 mm 3 at x=2.0, 0.640 mm 3 at x=1.0, 0.641 mm 3 at x=0 and 1.419 mm 3 for the substrate). More Cr addition into the cladding material will contribute to the formation of a HEA coating composed of single HCPwith excellent corrosion and wear resistance.

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“…In comparison to α ‐type Ti alloys, ( α + β)‐type Ti alloys are heat treatable, and hence, their mechanical properties can be optimized by heat treatment. The volume fractions and natures of α and β phases may vary according to the alloy chemistry, heat treatment temperature, and cooling rate . Previous works show that the strength of ( α + β)‐type Ti alloys can be improved by 30–50% via appropriate solution treatment and aging while their elastic moduli maintain at a similar level .…”

Section: Alloy Development and Mechanical Behaviormentioning

confidence: 99%

A Review on Biomedical Titanium Alloys: Recent Progress and Prospect

2019

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Compared with stainless steel and Co-Cr-based alloys, Ti and its alloys are widely used as biomedical implants due to many fascinating properties, such as superior mechanical properties, strong corrosion resistance, and excellent biocompatibility. After briefly introducing several most commonly used biomedical materials, this article reviews the recent development in Ti alloys and their biomedical applications, especially the low-modulus β-type Ti alloys and their design methods. This review also systemically investigates the recently attractive progress in preparation of biomedical Ti alloys, including additive manufacturing, porous powder metallurgy, and severe plastic deformation, applied in the manufacturing and the influenced microstructures and properties. Nevertheless, there are still some problems with the long-term performance of Ti alloys, and therefore several surface modification methods are reviewed to further improve their biological activity, wear resistance, and corrosion resistance. Finally, the biocompatibility of Ti and its alloys is concluded. Summarizing the findings from literature, future prediction is also conducted. Darmstadt. His current research interest is focusing on the metal additive manufacturing (e.g. selective laser melting, electron beam melting), titanium alloys and composites, and processing-microstructure-properties in high-performance materials.

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Heat Treatment Degrading the Corrosion Resistance of Selective Laser Melted Ti-6Al-4V Alloy

Cited by 119 publications

References 46 publications

Additive Manufacturing of Titanium Alloys by Electron Beam Melting: A Review

Additive Manufacturing of Titanium Alloys by Electron Beam Melting: A Review

Investigation into corrosion and wear behaviors of laser-clad coatings on Ti6Al4V

A Review on Biomedical Titanium Alloys: Recent Progress and Prospect

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