The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

Kurzynowski, Tomasz; Madeja, Marcin; Dziedzic, Robert; Kobiela, Karol

doi:10.1155/2019/2903920

Cited by 33 publications

(24 citation statements)

References 31 publications

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“…Such similarity can be explained by the similar α + β microstructure observed in both types of alloys after the EBM process. The microhardness of the EBM build sample seemed to slightly lower (but same in standard deviation) than what Kurzynowski et al [13] reported for EBM build Ti55511, previously.…”

Section: Microstructures Of the Build Materialssupporting

confidence: 46%

Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511

et al. 2020

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The effect of electron-beam melting (EBM) and selective laser melting (SLM) processes on the chemical composition, phase composition, density, microstructure, and microhardness of as-built Ti55511 blocks were evaluated and compared. The work also aimed to understand how each process setting affects the powder characteristics after processing. Experiments have shown that both methods can process Ti55511 successfully and can build parts with almost full density (>99%) without any internal cracks or delamination. It was observed that the SLM build sample can retain the phase composition of the initial powder, while EBM displayed significant phase changes. After the EBM process, a considerable amount of α Ti-phase and lamella-like microstructures were found in the EBM build sample and corresponding powder left in the build chamber. Both processes showed a similar effect on the variation of powder morphology after the process. Despite the apparent difference in alloying composition, the EBM build Ti55511 sample showed similar microhardness as EBM build Ti-6Al-4V. Measured microhardness of the EBM build sample is approximately 10% higher than the SLM build, and it measured as 348 ± 30.20 HV.

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Section: Microstructures Of the Build Materialssupporting

confidence: 46%

Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511

et al. 2020

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“…Liu et al [42] prepared a porous β-type Ti-24Nb-4Zr-8Sn with 70% porosity using EBM and found that a lower scanning speed results in more input energy; thereby, the produced struts with higher yield strength and fewer flaws. Kurzynowski et al [178] discussed the effect of the EBM process parameters on the porosity and microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe alloy and pointed out that the maximum hardness is obtained at the energy input of 30 J/mm 3 and the scanning speed of 1800 mm/s. In addition, the Al content in Ti-5Al-5Mo-5V-1Cr-1Fe alloy is related to the scanning speed adopted.…”

Section: Additive Manufacturingmentioning

confidence: 99%

Recent Development in Beta Titanium Alloys for Biomedical Applications

Chen

Cui

Zhang

2020

Metals

181

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β-type titanium (Ti) alloys have attracted a lot of attention as novel biomedical materials in the past decades due to their low elastic moduli and good biocompatibility. This article provides a broad and extensive review of β-type Ti alloys in terms of alloy design, preparation methods, mechanical properties, corrosion behavior, and biocompatibility. After briefly introducing the development of Ti and Ti alloys for biomedical applications, this article reviews the design of β-type Ti alloys from the perspective of the molybdenum equivalency (Moeq) method and DV-Xα molecular orbital method. Based on these methods, a considerable number of β-type Ti alloys are developed. Although β-type Ti alloys have lower elastic moduli compared with other types of Ti alloys, they still possess higher elastic moduli than human bones. Therefore, porous β-type Ti alloys with declined elastic modulus have been developed by some preparation methods, such as powder metallurgy, additive manufacture and so on. As reviewed, β-type Ti alloys have comparable or even better mechanical properties, corrosion behavior, and biocompatibility compared with other types of Ti alloys. Hence, β-type Ti alloys are the more suitable materials used as implant materials. However, there are still some problems with β-type Ti alloys, such as biological inertness. As such, summarizing the findings from the current literature, suggestions forβ-type Ti alloys with bioactive coatings are proposed for the future development.

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“…, indicating pore defects dominate the upper surface roughness. Among them, orange peel is the result of discontinuity of melted track due to the high scan velocity [22] . Figure 4 shows that the upper surface roughness by the four manufacturing strategies is similar, i.e., is approximately 4 μm.…”

Section: Fig 1: Flow Charts Of Four Types Of Manufacturing Strategiesmentioning

confidence: 99%

Performance of Ti6Al4V fabricated by electron beam and laser hybrid preheating and selective melting strategy

et al. 2021

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Electron beam selective melting (EBM) and selective laser melting (SLM) are regarded as significant manufacturing processes for near-net-shaped Ti6Al4V components. Generally, in the conventional EBM process, preheating is necessitated to avoid "smoke" caused by the charging of electrons. In the conventional SLM process, laser as an energy source without the risk of "smoke" can be employed to melt metal powder at low temperatures. However, because of the low absorption rate of laser, the powder bed temperature cannot reach a high level. It is difficult to obtain as-built TiAl4V with favorable comprehensive properties via conventional EBM or SLM. Hence, two types of electron beam and laser hybrid preheating (EB-LHP) combined with selective melting strategies are proposed. Using laser to preheat powder allows EBM to be performed at a low powder bed temperature (EBM-LT), whereas using an electron beam to preheat powder allows SLM to be performed at a high powder bed temperature (SLM-HT). Ti6Al4V samples are fabricated using two different manufacturing strategies (i.e., EBM-LT and SLM-HT) and two conventional processes, i.e., EBM at a high powder bed temperature (EBM-HT) and SLM at a low powder bed temperature (SLM-LT). The temperature-dependent surface quality, microstructure, density, and mechanical properties of the as-built Ti6Al4V samples are characterized and compared. Results show that EBM-LT Ti6Al4V exhibits a higher ultimate tensile strength (981±43 MPa) and a lower elongation (12.2%±2.3%) than EBM-HT Ti6Al4V owing to the presence of α′ martensite. The SLM-HT Ti6Al4V possesses the highest ultimate tensile strength (1,059±62 MPa) and an elongation (14.8%±4.0%) comparable to that of the EBM-HT Ti6Al4V (16.6%±1.2%).

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The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

Cited by 33 publications

References 31 publications

Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511

Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511

Recent Development in Beta Titanium Alloys for Biomedical Applications

Performance of Ti6Al4V fabricated by electron beam and laser hybrid preheating and selective melting strategy

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