Abstract
The use of lasers or electron beams for rapid solidification surface modification of materials has become established metallurgical practice, Typically, processing is carried out by rapidly traversing (scanning) a high power density beam over the material surface, so as to induce melting of a thin surface layer. A high rate of energy delivery facilitates surface melting at very high melting efficiency, such that most of the absorbed energy is used for melting with only a small fraction going into heating of the substrate material. This ability to maintain a cold substrate while melting a thin surface layer of material develops steep thermal gradients, which results in rapid solidification (quenching) of the molten layer, after the cessation of energy input. Calculations show that cooling rates of 104 –108 °K/sec are readily attainable in appropriately thin sections.
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© 1987 Plenum Press, New York
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Kear, B.H., Strutt, P.R. (1987). Surface Modification by Rapid Solidification Laser and Electron Beam Processing. In: Cocke, D.L., Clearfield, A. (eds) Design of New Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9501-4_12
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DOI: https://doi.org/10.1007/978-1-4615-9501-4_12
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