Investigation on the Microstructure of Direct Laser Additive Manufactured Ti6Al4V Alloy

Han, Yuanfei; Lü, Weijie; Jarvis, Tom; Shurvinton, John; Wu, Xinhua

doi:10.1590/1516-1439.322214

Cited by 23 publications

(9 citation statements)

References 10 publications

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“…Laser power has significant effects on deposition efficiency and wear resistance as well; and strong interactions with scanning speed and the powder flow rate [4,22]. Moreover, laser power shows a significant influence on the grain size and the phase structure-increased laser power leading generally to coarser grains and microstructures [36,48].…”

mentioning

confidence: 99%

Laser Metal Deposition of Ti6Al4V—A Brief Review

et al. 2020

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Laser metal deposition (LMD) is one of the most important laser additive manufacturing processes. It can be used to produce functional coatings, to repair damaged parts and to manufacture metal components. Ti6Al4V is one of the most commonly used titanium alloys, since it features a good balance of the mechanical properties of strength and ductility. The LMD of Ti6Al4V is attracting more and more attention from both science and engineering. The interest in processing Ti6Al4V with LMD in industry, especially in aerospace and medical branches, has been increasing in the last few years. In this paper, the state of the art for LMD of Ti6Al4V is reviewed. In the first part, the basics for Ti6Al4V, including, for example, the development history, the material properties, the applications, the crystal structure, the heat treatment and the mechanical properties, are introduced. In the second part, the main emphasis is on state of the art for LMD of Ti6Al4V. Initially, the process parameters of the current state of the art in the last years and their effects are summarized. After that, the typical microstructure after LMD is discussed. Then, the conducted heat treatment methods and the achievable mechanical properties are presented. In the end, some of the existing, current challenges are mentioned, and the possible research directions for the future are proposed.

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confidence: 99%

Laser Metal Deposition of Ti6Al4V—A Brief Review

et al. 2020

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“…5a and 8, for example). Similar controls have been developed for other powder processes such as direct laser deposition involving very different powder properties (especially powder sizes) and other laser beam properties [48][49][50][51].…”

Section: Powder Bed Technologies: Electron and Laser Beam Meltingmentioning

confidence: 99%

“…2, optimal processing parameter adjustments might also allow for specialized columnar grain or a single-crystal structure to be achieved in turbine blade AM fabrication [37,38,54]. These features can even be achieved in Ti-6Al-4V as recently described by Han et al [48] who demonstrated the effect of laser parameters (in an argon atmosphere) on the microstructure of Ti-6Al-4V, achieving columnar grains extending * 10 mm or more, heavy grain widths as large as * 1 mm, grown on equiaxed grains (200-800 lm) of Ti-6Al-4V starter plates. Similar, directional grains ([ 1 mm) of Inconel 718 alloy (see ''Glossary of Alloy Compositions'') have been grown on an equiaxed, grain structure (* 60 lm) of type 316L stainless steel (see ''Glossary of Alloy Compositions'') by electron beam melting as well [55].…”

Section: Powder Bed Technologies: Electron and Laser Beam Meltingmentioning

confidence: 99%

A Metallographic Review of 3D Printing/Additive Manufacturing of Metal and Alloy Products and Components

Murr

2018

Metallogr. Microstruct. Anal.

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Applications and examples of light and electron micrographs illustrating microstructures, which describe metallurgical phenomena in 3D printing/additive manufacturing of metal and alloy products and components, are presented along with extensive process and processing parameter descriptions and review. Examples include microstructures that have defined turbine blade fabrication and optimization over the past half century, including contemporary electron beam melting fabrication of turbine blade alloys and other novel microstructures and architectures, which result from layer by layer, nonequilibrium melt solidification and epitaxial growth involving powder bed laser and electron beam fabrication. Phase transformations and second-phase formation by rapid cooling in metal and alloy components fabricated by laser and electron beam melting technologies are illustrated for a range of high-temperature materials. Using a range of examples, the advantages of fabricating complex (especially porous) biomedical and related commercial products are described. Prospects for future developments of direct 3D metal and alloy droplet printing, as a key component of the digital factory of the future, are described. This technology is compared with more conventional solidification and powder bed layer building thermo-kinetics, especially in the context of large structure and component fabrication.

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“…The appearance of the banded microstructure in AM of titanium alloys has been reported [73,[239][240][241][242]. The common features between the reported banded microstructure are that the repeating pattern has approximately the same thickness as each layer thickness and that the top-most region often consists of no bandings.…”

Section: Microstructural Banding Formation In Sebm-built Ti-6al-4vmentioning

confidence: 80%

“…to be formed through the eutectoid reaction when the β phase transforms into the α+β phases during cooling. A study based on the direct laser deposited Ti-6Al-4V alloy reported that the microstructural banding gradually disappeared at the top of the build sample [241].…”

Section: Microstructural Banding Formation In Sebm-built Ti-6al-4vmentioning

confidence: 99%

Investigation of grain growth and microstructural evolution in electron beam melting additive manufacturing process

Chandra¹

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Investigation on the Microstructure of Direct Laser Additive Manufactured Ti6Al4V Alloy

Cited by 23 publications

References 10 publications

Laser Metal Deposition of Ti6Al4V—A Brief Review

Laser Metal Deposition of Ti6Al4V—A Brief Review

A Metallographic Review of 3D Printing/Additive Manufacturing of Metal and Alloy Products and Components

Investigation of grain growth and microstructural evolution in electron beam melting additive manufacturing process

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