Analysis of coaxial laser cladding processing conditions

Oliveira, U. de; Ocelík, Václav; Hosson, J.Th.M. De

doi:10.1016/j.surfcoat.2004.06.029

Cited by 379 publications

(145 citation statements)

References 11 publications

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“…The desired properties of surfaceengineered components are improved corrosion resistance through barrier or sacrificial protection, improved wear resistance and mechanical properties such as fatigue and toughness. The surface modification of metals, using high intensity lasers, accepts various methods in making use of the heat from the laser beam in enhancing the morphology and microstructure in order to achieve numerous metallurgical outcomes [13]. Laser surface modification of materials entails an extensive composition of additive and subtractive methods.…”

Section: Direct Laser Metal Depositionmentioning

confidence: 99%

Influence of Rapid Solidification on the Thermophysical and Fatigue Properties of Laser Additive Manufactured Ti-6Al-4V Alloy

Fatoba¹,

Akinlabi²,

Makhatha³

2017

Aluminium Alloys - Recent Trends in Processing, Characterization, Mechanical Behavior and Applications

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Modern industrial applications require materials with special surface properties such as high hardness, wear and corrosion resistance. The performance of material surface under wear and corrosion environments cannot be fulfilled by the conventional surface modifications and coatings. Therefore, different industrial sectors need an alternative technique for enhanced surface properties. The purpose of this is to change or enhance inherent properties of the materials to create new products or improve on existing ones. The most effective and economical engineering solution to prevent or minimize such surface region of a component is done by fiber lasers. Additive manufacturing (AM) is a breaking edge fabrication technique with the possibility of changing the perception of design and manufacturing as a whole. It is well suitable for the building and repairing applications in the aerospace industry which usually requires high level of accuracy and customization of parts which usually employ materials known to pose difficulties in fabrication such as titanium alloys. The current development focus of AM is to produce complex shaped functional metallic components, including metals, alloys and metal matrix composites (MMCs), to meet demanding requirements from aerospace, defense, and automotive industries.

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Section: Direct Laser Metal Depositionmentioning

confidence: 99%

Influence of Rapid Solidification on the Thermophysical and Fatigue Properties of Laser Additive Manufactured Ti-6Al-4V Alloy

Fatoba¹,

Akinlabi²,

Makhatha³

2017

Aluminium Alloys - Recent Trends in Processing, Characterization, Mechanical Behavior and Applications

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“…Chemical compositions of the alloying powders and substrate were provided by producers and the compositions of the claddings were determined by EDS analysis ( Table 2). The high Fe content of the Stellite 20 sample is caused by the dilution of the steel substrate in the clad when the coaxial cladding nozzle [1] was used.…”

Section: Laser Cladding: Experimental Setup and Sample Characterizationmentioning

confidence: 99%

“…The laser cladding technique by powder injection is an attractive methodology that allows the deposition of thick protective metallic coatings on softer substrates [1,2]. The process consists of producing a protective layer on the surface of the substrate using a high power laser beam as a heat source while a powder stream is blown under the laser beam.…”

Section: Introductionmentioning

confidence: 99%

Residual stress analysis in Co-based laser clad layers by laboratory X-rays and synchrotron diffraction techniques

Oliveira

Ocelík

Hosson

2006

Surface and Coatings Technology

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Residual stress analysis in Co-based laser clad layers by laboratory X-rays and synchrotron diffraction techniques de Oliveira, U.; Ocelik, Vaclav; De Hosson, J.T.M. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractThick Co-based coatings were prepared by laser cladding technique on C45 steel substrates with different geometries. Microstructural observations were realized using optical, scanning electron and orientation imaging microscopy. The residual strain state on the surface of a clad layer was determined by the sin 2 Ψ-technique using laboratory X-rays. The diffraction of synchrotron radiation in θ-2θ was used to acquire information from the bulk of the materials. Internal stress was characterized through the depth and width of the coatings. Elastic moduli required for stress state calculation were measured by the nanoindentation technique and also estimated from moduli of γ-Co single crystal. A misorientation between principal strain direction and cladding direction was observed on the surface of Stellite 20 coating. The stress profiles inside clad layers reveal the influence of scanning speed, clad layer shape, laser tracks overlap and stress release component due to crosssectioning. The strong texture inside the coatings affects diffraction conditions, the precision of the measurements and also ability to collect experimental data.

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“…This process is repeated for a number of layers to create various geometries. With the use of LDMD, complex shapes with variable degrees of complexity can be easily realized [1,2]. Applications of the laser direct metal deposition process have been found in the aerospace and automotive industries for repair and tooling [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Melt Pool Variables and Process Parameters in Laser Direct Metal Deposition of Aerospace Alloys

Shah

Pinkerton

Ahmad

et al. 2010

Materials and Manufacturing Processes

102

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Despite considerable advances in of laser direct metal deposition (LDMD) process optimization, there is rather limited work reported on the effects of melt pool variables on the final deposit characteristics. This article considers the effects of process parameters and melt pool characteristics on the deposition of Inconel 718 powder on a Ti-6Al-4V thin wall. A 1.5 kW diode laser and LDMD system is used to produce a series of deposits. Images of the process are captured using Cu-vapor laser illumination and a high speed camera with long range microscopy optics, and quantitative results are extracted via image analysis. Process parameters such as carrier gas flow rate, powder mass flow rate and laser operating mode (CW and pulsed) and in process variables such as quantified melt pool disturbance, and final part characteristics are correlated and discussed. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and energy dispersive X-ray spectroscopy (EDS) are used to analyze deposited clads in terms of elemental composition and flow characteristics in the deposition melt pool. Melt pool disturbance is found to be a vital parameter in determining the surface roughness of the final part. An inverse relation between the mean surface disturbance of the melt pool and the surface roughness of the part is observed, and carrier gas flow rate and powder mass flow rate both affect the overall melt pool size. The work has implications for the selection of process parameters for commercial laser deposition processes-the speed with which powder is delivered to the melt pool as well as the mass flow rate may need to be taken into account when calculating build rate and for a good surface finish requiring minimum post process finishing a stable melt pool may actually be the worst situation.

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Analysis of coaxial laser cladding processing conditions

Cited by 379 publications

References 11 publications

Influence of Rapid Solidification on the Thermophysical and Fatigue Properties of Laser Additive Manufactured Ti-6Al-4V Alloy

Influence of Rapid Solidification on the Thermophysical and Fatigue Properties of Laser Additive Manufactured Ti-6Al-4V Alloy

Residual stress analysis in Co-based laser clad layers by laboratory X-rays and synchrotron diffraction techniques

Effects of Melt Pool Variables and Process Parameters in Laser Direct Metal Deposition of Aerospace Alloys

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