A study on defect-induced fatigue failures in SLM Ti6Al4V Alloy

Bhandari, Litton; Gaur, Vidit

doi:10.1016/j.prostr.2022.12.067

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…In a mechanical sense, internal defects such as irregular pores posed a challenge as they accumulated the flow of force under tensile load and tended to an area of stress concentration [79]. Consequently, the initialization of a crack was more apparent in the stress-accumulated areas and may significantly reduce the service life of components [80,81]. In enhancement, gas pores and quasi-cleavage facets with a high accumulation of dimples at the grain boundaries of 0 • samples were discovered.…”

Section: Fractography Of Tensile Specimensmentioning

confidence: 99%

Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion

Milaege,

Eschemann,

Hoyer

et al. 2024

Crystals

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Through tailoring the geometry and design of biomaterials, additive manufacturing is revolutionizing the production of metallic patient-specific implants, e.g., the Ti-6Al-7Nb alloy. Unfortunately, studies investigating this alloy showed that additively produced samples exhibit anisotropic microstructures. This anisotropy compromises the mechanical properties and complicates the loading state in the implant. Moreover, the minimum requirements as specified per designated standards such as ISO 5832-11 are not met. The remedy to this problem is performing a conventional heat treatment. As this route requires energy, infrastructure, labor, and expertise, which in turn mean time and money, many of the additive manufacturing benefits are negated. Thus, the goal of this work was to achieve better isotropy by applying only adapted additive manufacturing process parameters, specifically focusing on the build orientations. In this work, samples orientated in 90°, 45°, and 0° directions relative to the building platform were manufactured and tested. These tests included mechanical (tensile and fatigue tests) as well as microstructural analyses (SEM and EBSD). Subsequently, the results of these tests such as fractography were correlated with the acquired mechanical properties. These showed that 90°-aligned samples performed best under fatigue load and that all requirements specified by the standard regarding monotonic load were met.

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Section: Fractography Of Tensile Specimensmentioning

confidence: 99%

Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion

Milaege,

Eschemann,

Hoyer

et al. 2024

Crystals

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show abstract

“…Повышение комплекса функциональных и механических свойств материалов, получаемых методом СЛП, связано с минимизацией внутренних дефектов материала в виде пор в перемычках. Дефектная пористость формируется вследствие недостаточной или чрезмерной плотности энергии, определяющей условия плавления порошка [15]. Для устранения дефектной пористости необходимо правильно подобрать параметры СЛП [4].…”

Section: Introductionunclassified

Improvement of selective laser melting regimes for the fabrication of Ti–6Al–4V porous structures for medical applications

Sheremetyev,

Lezin,

Kozik

et al. 2023

Izv.VUZ. Tsvet. Met.

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This article describes approaches to the optimization of regimes of selective laser melting (SLM) used in the fabrication of porous materials from medical grade Ti–6Al–4V alloy with thin structural elements and a low level of defect porosity. Improved fusion of thin elements based on SLM regimes is achieved due to a significant decrease in the distance between laser passes (from 0.11 to 0.04–0.05 mm). Moreover, the balance between the laser energy density and building rate is compensated by changing the laser speed and laser power. The results of the study of defect porosity and hardness of samples fabricated according to experimental SLM regimes allowed three promising sets of parameters to be defined. One was selected for studying mechanical properties in comparison with the reference SLM regime. In the aims of this study, the samples were developed and fabricated using the structures of rhombic dodecahedron and Voronoi types with a porosity of 70–75 %. The decrease in defect porosity was established at ≈1.8 % to 0.6 %, depending on the SLM regime. This promotes a significant increase in strength properties of the material, including an increase in the yield strength of rhombic dodecahedron from 76 to 132 MPa and the Voronoi structure from 66 to 86 MPa. The low Young module (1–2 GPa) remains, corresponding to the rigidity level of spongy bone tissue.

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Different post-processing methods to improve fatigue properties of additively built Ti-6Al-4V alloy

Bhandari

Gaur

2023

International Journal of Fatigue

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A study on defect-induced fatigue failures in SLM Ti6Al4V Alloy

Cited by 6 publications

References 7 publications

Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion

Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion

Improvement of selective laser melting regimes for the fabrication of Ti–6Al–4V porous structures for medical applications

Different post-processing methods to improve fatigue properties of additively built Ti-6Al-4V alloy

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