Comparing bio-tribocorrosion of selective laser melted Titanium-25% Niobium and conventionally manufactured Ti-6Al-4 V in inflammatory conditions

Chakkravarthy, V.; Manojkumar, P.; Lakshmanan, Mahadevan; Prasad, K. Eswar; Dafale, Rucha; Vadhana, V. Chitra; Narayan, Ranjani

doi:10.1016/j.jallcom.2023.169852

Cited by 19 publications

(9 citation statements)

References 36 publications

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“…To reduce the oxidation during the fabrication process, the closed loop system was purged with Ar. To assist with the build-up process, a base plate was employed and heated up at 200 • C. The subsequent scan direction was switched to 67 • between consecutive layers, which helps to limit thermal stress build up [36]. Including this scanning strategy, all the input parameters were selected based on the information available in literature to achieve dense specimens.…”

Section: Materials and L-pbf Of The Specimensmentioning

confidence: 99%

Microstructural and Nanoindentation Investigation on the Laser Powder Bed Fusion Stainless Steel 316L

Kurdi,

Tabbakh,

Basak

2023

Materials

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Additive manufacturing (AM) of stainless steel is more difficult than other metallic materials, as the major alloying elements of the stainless steel are prone to oxidation during the fabrication process. In the current work, specimens of the stainless steel 316L were made by the powder laser bed fusion (P-LBF) additive manufacturing process. These specimens were investigated by electron microscopy and micro-/nano-indentation techniques to investigate the microstructural aspects and the mechanical properties, respectively. Compositionally, a similar wrought stainless steel was subjected to identical investigation, and used as a benchmark material. The microstructure of the P-LBF-processed alloy shows both equiaxed and elongated grains, which are marginally smaller (3.2–3.4 μm) than that of the wrought counterpart (3.6 μm). Withstanding such marginal gain size refinement, the increase in shear stress and hardness of the L-PBF alloy was striking. The L-PBF-processed alloy possess about 1.92–2.12 GPa of hardness, which was about 1.5 times higher than that of wrought alloy (1.30 GPa), and about 1.15 times more resistant against plastic flow of material. Similarly, L-PBF-processed alloy possess higher maximum shear stress (274.5–294.4 MPa) than that of the wrought alloy (175.9 MPa).

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Section: Materials and L-pbf Of The Specimensmentioning

confidence: 99%

Microstructural and Nanoindentation Investigation on the Laser Powder Bed Fusion Stainless Steel 316L

Kurdi,

Tabbakh,

Basak

2023

Materials

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“…Referring to the microstructures depicted in Figure 8, it is expected that the early deposited layers, experiencing greater heat dissipation, will develop a fine grain structure, consequently exhibiting higher hardness. Conversely, as the layer height increases, the reduction in heat dissipation is likely to result in the formation of a coarse grain structure, leading to diminished hardness properties, aligning with the principles of the classical Hall-Pitch theory [27,28]. The published results [29] of an Al alloy fabricated with a selective laser melting (SLM) process involve 133 HV, which is near to LDED-fabricated alloys…”

Section: Micro-hardnessmentioning

confidence: 62%

Characterization of Al-12Si Thin-Wall Properties Fabricated with Laser Direct Energy Deposition

Rumman,

Manjaiah,

Touzé

et al. 2023

Sustainability

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Additive manufacturing is an emerging process that is used to manufacture industrial parts layer by layer and can produce a wide range of geometries for various applications. AM parts are adopted for aerospace, automobiles, antennas, gyroscopes, and waveguides in electronics. However, there are several challenges existing in manufacturing Al components using the AM process, and their mechanical and microstructural properties are not yet fully validated. In the present study, a gas-atomised powder of a eutectic Al-12Si alloy was used as feedstock for the Laser Direct Energy Deposition (LDED) process. A SEM analysis of Al-12Si powder used for processing illustrated that particles possess appropriate morphology for LDED. A numerical control system was used to actuate the deposition head towards printing positions. The deposited samples revealed the presence of Al-rich and Al-Si eutectic regions. The porosity content in the samples was found to be around 2.6%. Surface profile roughness measurements and a microstructural analysis of the samples were also performed to assess the fabricated sample in terms of the roughness, porosity, and distribution of Al and Al/Si eutectic phases. The tensile properties of fabricated thin walls were better compared to casted Al alloys due to the uniform distribution of Si in each layer. Micro-hardness tests on the deposited samples showed a hardness of 95 HV, which is equivalent to casted and powder bed fusion melting samples. The gas atomised Al-12Si powders are highly reflective to a laser and also quick oxidation takes place, which causes defects, porosity, and the balling effect during fabrication. The results can be used as a base guide for the further fabrication of aerospace component design with high structural integrity.

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“…The chemical properties of the implant materials may play a key role in controlling the osteogenesis processes. Niobium (10–40%) in the Ti alloy can enhance the biocompatibility of the material, promote osteoblast adhesion, and stimulate cell growth . Zhao et al proposed that the adherence of human primary osteoblasts increased, and cell proliferation was enhanced with the incorporation of Nb 2 O 5 into TiO 2 .…”

Section: Discussionmentioning

confidence: 99%

“…Niobium (10−40%) in the Ti alloy can enhance the biocompatibility of the material, promote osteoblast adhesion, and stimulate cell growth. 52 Zhao et al proposed that the adherence of human primary osteoblasts increased, and cell proliferation was enhanced with the incorporation of Nb 2 O 5 into TiO 2 . 53 Incorporating Sn in Ti−Nb alloys enhanced the proliferation of MC3T3-E1 cells, which may be related to its surface oxide.…”

Section: Discussionmentioning

confidence: 99%

Corrosion and Biological Behaviors of Biomedical Ti–24Nb–4Zr–8Sn Alloy under an Oxidative Stress Microenvironment

Liu,

Yan,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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Biomaterials can induce an inflammatory response in surrounding tissues after implantation, generating and releasing reactive oxygen species (ROS), such as hydrogen peroxide (H 2 O 2 ). The excessive accumulation of ROS may create a microenvironment with high levels of oxidative stress (OS), which subsequently accelerates the degradation of the passive film on the surface of titanium (Ti) alloys and affects their biological activity. The immunomodulatory role of macrophages in biomaterial osteogenesis under OS is unknown. This study aimed to explore the corrosion behavior and bone formation of Ti implants under an OS microenvironment. In this study, the corrosion resistance and osteoinduction capabilities in normal and OS conditions of the Ti−24Nb−4Zr−8Sn (wt %, Ti2448) were assessed. Electrochemical impedance spectroscopy analysis indicated that the Ti2448 alloy exhibited superior corrosion resistance on exposure to excessive ROS compared to the Ti−6Al−4V (TC4) alloy. This can be attributed to the formation of the TiO 2 and Nb 2 O 5 passive films, which mitigated the adverse effects of OS. In vitro MC3T3-E1 cell experiments revealed that the Ti2448 alloy exhibited good biocompatibility in the OS microenvironment, whereas the osteogenic differentiation level was comparable to that of the TC4 alloy. The Ti2448 alloy significantly alleviates intercellular ROS levels, inducing a higher proportion of M2 phenotypes (52.7%) under OS. Ti2448 alloy significantly promoted the expression of the antiinflammatory cytokine, interleukin 10 (IL-10), and osteoblast-related cytokines, bone morphogenetic protein 2 (BMP-2), which relatively increased by 26.9 and 31.4%, respectively, compared to TC4 alloy. The Ti2448 alloy provides a favorable osteoimmune environment and significantly promotes the proliferation and differentiation of osteoblasts in vitro compared to the TC4 alloy. Ultimately, the Ti2448 alloy demonstrated excellent corrosion resistance and immunomodulatory properties in an OS microenvironment, providing valuable insights into potential clinical applications as implants to repair bone tissue defects.

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Comparing bio-tribocorrosion of selective laser melted Titanium-25% Niobium and conventionally manufactured Ti-6Al-4 V in inflammatory conditions

Cited by 19 publications

References 36 publications

Microstructural and Nanoindentation Investigation on the Laser Powder Bed Fusion Stainless Steel 316L

Microstructural and Nanoindentation Investigation on the Laser Powder Bed Fusion Stainless Steel 316L

Characterization of Al-12Si Thin-Wall Properties Fabricated with Laser Direct Energy Deposition

Corrosion and Biological Behaviors of Biomedical Ti–24Nb–4Zr–8Sn Alloy under an Oxidative Stress Microenvironment

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