J. Phys. IV France 01 (1991) C7-55-C7-59
HIGH TEMPERATURE PROPERTIES OF LASER ALLOYED TITANIUMA. FASASI, M. PONS and A. GALERIE
Laboratoire Science des Surfaces et Matériaux Carbonés, URA CNRS n° 413, ENS d'Electrochimie et d'Electrométallurgie de Grenoble, Institut National Polytechnique de Grenoble, BP. 75, Domaine Universitaire, F-38402 St-Martin d'Hères, France
Surface alloys are of great interest for improving the mechanical and/or chemical properties of the near surface region of metallic materials. Surface alloy formation by laser melting involves the base metal and one or several foreign elements, introduced either in a predeposited slurry or directly in the melt pool by the means of a power feeder. Surface alloys were produced on titanium by laser irradiation of predeposited aluminium and silicon powders. It was observed that hardness increased with silicon content and carbon dissolution. The maximum value achieved was as high as 1100 Hv without the presence of carbon. It was also observed that laser aluminization improved isothermal as well as cyclic oxidation resistance while the presence of carbon was detrimental. The addition of silicon led to a decrease of the minimum concentration of aluminium necessary to form a continous and protective layer of Al2O3.
© EDP Sciences 1991