EL CHEIKH, Hussam; COURANT, Bruno; BRANCHU, Samuel; HUANG, Xiaowei; HASCOËT, Jean-Yves; GUILLÉN, Ronald

doi:10.1016/j.optlaseng.2012.07.002

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EL CHEIKH, Hussam
État Mécanique et Microstructure des Matériaux [E3M]

COURANT, Bruno
État Mécanique et Microstructure des Matériaux [E3M]

BRANCHU, Samuel
État Mécanique et Microstructure des Matériaux [E3M]

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Optics and Lasers in Engineering. 2012, vol. 50, n° 12, p. 1779-1784

Elsevier

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Direct Laser Fabrication is a promising manufacturing technology. A moving laser beam heats a coaxially delivered powder in a gas jet through nozzle in order to fabricate an end-use part directly. The clad geometry is an important process characteristic. In this work, different velocities and different laser shift-distances between two successive layers are used to build walls. For each condition, 1, 3, 5 and 10 layers walls are analyzed, showing the domain of a success and optimal construction. A relationship between the process parameters and the wall height is obtained with a good correlation. In addition a linear relationship relates the wall height to the number of layers. Columnar dendrites are observed on the bottom laser clad and equiaxed grains on the top one. Microhardness measurements show a homogeneous microhardness in each layer but a higher microhardness in the first one.< Réduire

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Direct Laser Fabrication

316L stainless steel

Laser track geometry

Microstructure

Microhardness

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Direct laser fabrication process with coaxial powder projection of 316L steel. Geometrical characteristics and microstructure characterization of wall structures

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