Some Aspects Of The Formation Of Laser Clad Tracks

Steen, W. M.; Weerasinghe, V. M.; Monson, P

doi:10.1117/12.938104

Cited by 50 publications

(16 citation statements)

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“…Among these methods, the laser cladding process has many advantages over conventional ones such as good bonding between clad layer and substrate, low heat input and distortion of the substrate, etc. [17][18][19][20][21][22][23][24][25][26]. To reduce post-cladding machining work, the overlap between two clad layers is generally kept between 50% and 60% [27].…”

Section: Introductionmentioning

confidence: 99%

Erosion wear behavior of laser clad surfaces of low carbon austenitic steel

Desale

Paul

Gandhi

et al. 2009

Wear

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Section: Introductionmentioning

confidence: 99%

Erosion wear behavior of laser clad surfaces of low carbon austenitic steel

Desale

Paul

Gandhi

et al. 2009

Wear

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“…The laser cladding technique consists of producing a protective layer on the surface of the metallic substrate using a high power laser as heat source while a powder stream is blown under the laser beam [1,2]. The substrate is scanned by the laser that creates a melt pool with a height corresponding to the thickness of a single clad track.…”

Section: Introductionmentioning

confidence: 99%

Microstresses and microstructure in thick cobalt-based laser deposited coatings

Oliveira

Ocelík

Hosson

2007

Surface and Coatings Technology

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Microstresses in a thick laser clad Co-based coating on steel substrate were investigated with 3D X-ray microscopy using an intense synchrotron microfocused beam. The microstructure was examined with light microscopy and field emission scanning electron microscopy equipped with X-ray energy dispersive spectroscopy and Electron Back Scattering Diffraction (orientation imaging microscopy). Microhardness and scratch resistance variations inside the coating are related to the local microstructure influenced by additional heating and by melt convection during the laser track overlapping. The residual microstrains were accessed with a high spatial resolution defined by the size of the synchrotron microbeam. Type II residual strains and stresses on the level of individual grains and dendrites were analyzed in terms of tensor invariants, hydrostatic and von Mises shear stress, along the depth of a slightly diluted clad track. The upper part of the coating shows a constant spread of hydrostatic stresses between −500 and 500 MPa; towards the bottom of the track the spread of these stresses increases almost linearly with depth. A correlation between the microstructural features and the spread of the hydrostatic microstresses was found. It is concluded that microstresses in individual neighboring grains are inhomogeneously dispersed.

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“…We intend only to refer to a few articles [6][7][8][9][10][11][12] that one can find in the exhaustive literature. From these articles it is clear that the main parameters are the speed of processing, the mass feed rate, the laser power and the beam diameter.…”

Section: The Relevant Parametersmentioning

confidence: 99%

Control and optimization of the laser cladding process using matrix cameras and image processing

Mériaudeau

Truchetet

1996

Journal of Laser Applications

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The laser cladding process, which consists of adding a melted powder on to a substrate in order to improve or change the behavior of the material against corrosion or fatigue, involves many parameters. In order to produce good tracks some of these parameters need to be controlled during the process. We present a low cost system using two charge coupled device (CCD) matrix cameras. One camera provides surface temperature measurements while the other gives information about the powder distribution or geometric characteristics of the tracks. The surface temperature enables us -by use of the Beer-Lambert Law -to detect variations in the mass feed rate. Using such a system we are able to detect fluctuation of 2-3 g min -1 in the mass flow rate. The other camera gives us information related to the powder distribution, a simple algorithm applied to the data acquired from the CCD matrix camera allows us to see very weak fluctuations within both gas fluxes (carriage or protection gas). During the process, this camera is also used to perform geometrie measurements. The height and the width of the track are obtained in real time and enable the operator to obtain information related to the process parameters such as the speed of processing or the mass flow rate. We show the result of our system that allows enhancement of the efficiency of the laser cladding process. The conclusion is dedicated to a summary of the presented works and future expectations for this technique.

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Some Aspects Of The Formation Of Laser Clad Tracks

Abstract: Laser surface cladding with argon blown powder' is a process whereby a powder stream is blown into a laser -generated melt pool.The mechanisms in this melt pool which determine the optimum operating conditions for low dilution, zero porosity and a continuous clad track are discussed.

Cited by 50 publications

References 0 publications

Erosion wear behavior of laser clad surfaces of low carbon austenitic steel

Erosion wear behavior of laser clad surfaces of low carbon austenitic steel

Microstresses and microstructure in thick cobalt-based laser deposited coatings

Control and optimization of the laser cladding process using matrix cameras and image processing

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