Potential of Laser Engineered Net Shaping (LENS) Technology

Palčić, Iztok; Balažic, M.; Milfelner, M.; Buchmeister, Borut

doi:10.1080/10426910902809776

Cited by 43 publications

(19 citation statements)

References 9 publications

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“…The family of laser freeform fabrication techniques is found to be promising for the fabrication of FGMs, since they are built by successive deposition, melting and solidification of layers of varying compositions [1]. Laser Engineered Net Shaping (LENS) is one of the laser freeform fabrication techniques used to build functional parts directly from 3D CAD model [2].…”

Section: Introductionmentioning

confidence: 99%

Chemical analysis, structure and mechanical properties of discrete and compositionally graded SS316–IN625 dual materials

Savitha

Reddy

Venkataramana

et al. 2015

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Chemical analysis, structure and mechanical properties of discrete and compositionally graded SS316–IN625 dual materials

Savitha

Reddy

Venkataramana

et al. 2015

Materials Science and Engineering: A

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“…Repeated clad multipass gives an area coating. Controlled repetition of this process allows the fabrication of 3-dimensional (3D) structures [4] which is the main driver of this work.…”

Section: Introductionmentioning

confidence: 99%

“…In this process, a laser generated melt pool is steadily fed with the desired materials to form a clad [4]. Repeated clad multipass gives an area coating.…”

Section: Introductionmentioning

confidence: 99%

Laser Deposition of Ti-6Al-4V Wire with WC Powder for Functionally Graded Components

Farayibi

Folkes

Clare

2013

Materials and Manufacturing Processes

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In this study, metal matrix ceramic (MMC) functionally graded components are fabricated using a method based upon shape metal deposition. Laser deposition provides a suitable means for metallic coating and surface alloying for many applications. New functionally graded components can be built with surface and bulk properties locally modified. Tailoring to meet location specific demands such as modified tribological, corrosion, and thermal properties is achievable. This article investigates the cladding of Ti-6Al-4V wire and WC powder concurrently fed into the laser generated melt pool on a Ti-6Al-4V substrate. The addition of WC particles promotes its hardness and improves wear resistance. Results obtained showed the micrograph of the functionally graded area coating of Ti-6Al-4V/WC matrix in which WC particles are dissolved resulting in TiC/W two phase nodules. Scanning electron microscope (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), and microhardness characterization is presented for the coating. Fiber laser deposition is demonstrated as a means to produce titanium matrix ceramic composite structures with a demonstrator part is presented. INTRODUCTIONTitanium alloys have found use in petrochemical, chemical, oil and gas, and ground transport industries [1]. This is due to superior high strength to weight, toughness, ductility, fatigue, and corrosion resistance. Ti and its alloys offer about 40% weight saving when used in place of steel [2]. However, Ti alloy has poor tribological characteristics due to high friction coefficients and low hardness [3], which limits its use for applications where sliding or abrasive wear is prevalent. Having reinforcing elements or ceramics in the Ti alloy (forming Ti MMC) could ameliorate the wear shortcomings and also enhances its strength for high temperature applications.Laser cladding is a suitable and cost-effective manufacturing technique which allows deposition of materials which may improve wear, corrosion, and thermal properties. In this process, a laser generated melt pool is steadily fed with the desired materials to form a clad [4]. Repeated clad multipass gives an area coating. Controlled repetition of this process allows the fabrication of 3-dimensional (3D) structures [4] which is the main driver of this work.Metal matrix composites (MMCs) are desirable for various applications which may include wear surfaces, thermal management, and structural stiffness [5]. Various manufacturing processes such as plasma melt injection [6], friction surfacing [7], powder metallurgy [8], and spray deposition technique [9] have been employed in

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“…Additive manufacturing (AM) is being developed due to its capacity to create complex part geometries, include limited production steps and parts, and produce minimal waste [1][2][3]. One AM method for depositing structural metals is Laser Engineered Net Shaping (LENS®) direct laser deposition (DLD), a process which creates a melt pool with a laser and deposits powder through nozzles towards the melt pool, some of which adds to its volume [4][5][6]. Not needing a full bed of powder and having the freedom to deposit material selectively allows for the construction of traditionally impossible part geometries, such as complex cooling channels and turbine parts [5,7].…”

Section: Introductionmentioning

confidence: 99%

Variation of hardness, microstructure, and Laves phase distribution in direct laser deposited alloy 718 cuboids

et al. 2017

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Property anisotropy and its unpredictability in direct laser-deposited material is a drawback to this additive manufacturing method. In this study, direct laser deposition was used to build threedimensional cuboids of Ni-based superalloy 718, which were examined with microscopy, and analyzed for hardness trends with contour mapping. Secondary electron and backscatter electron contrast imaging were used in conjunction with electron backscatter diffraction to understand microstructure. It is found that hardness decreased with increasing height and linear energy used during deposition. Also, the hardness of the inner hatching was higher than the outer contour, in both planar and cross-sectional surfaces. After an examination of grain structure and phase distribution, it is proposed that the hardness trends are caused by a combination of detrimental Laves phase and strengthening γ″ phase distribution.

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Potential of Laser Engineered Net Shaping (LENS) Technology

Cited by 43 publications

References 9 publications

Chemical analysis, structure and mechanical properties of discrete and compositionally graded SS316–IN625 dual materials

Chemical analysis, structure and mechanical properties of discrete and compositionally graded SS316–IN625 dual materials

Laser Deposition of Ti-6Al-4V Wire with WC Powder for Functionally Graded Components

Variation of hardness, microstructure, and Laves phase distribution in direct laser deposited alloy 718 cuboids

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