Marangoni Convection and Fragmentation in LASER Treatment [chapter]

Jean-Marie Drezet, Sélim Mokadem
2006 Materials Science Forum  
Epitaxial Laser Metal Forming (E-LMF) consists in impinging a jet of metallic powder onto a molten pool formed by controlled laser heating and thereby, generating epitaxially a single crystal deposit onto a single crystal substrate. It is a near net-shape process for rapid prototyping or repair engineering of single crystal high pressure/high temperature gas turbines blades. Single crystal repair using E-LMF requires controlled solidification conditions in order to prevent the nucleation and
more » ... e nucleation and growth of crystals ahead of the columnar dendritic front, i.e., to ensure epitaxial growth and to avoid the columnar to equiaxed transition.
doi:10.4028/0-87849-991-1.257 fatcat:sio45kyzmbhjxfuhjvlynrweju