Study on Laser Surface Melting of Carbon Steels in Controlled Atmospheres

概要

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Laser surface melting of carbon steels in controlled atmospheres was carried out using 2 kW CO_2 laser facility. Laser beam was introduced in to a vacuum chamber through a KCl flat lens as a window, and focused by a copper mirror. The effects of pressure, atmosphere, surface preparation of specimen and carbon content of base metal on penetration, hardness and carbon content of fusion zone were investigated. On account of these effects carbon content and hardness of fusion zone of graphite coated carbon steels without scale were increased by laser surface melting in vacuum. The fusion zone melted in helium, nitrogen or agron atmosphere showed a significant increase in hardness and carbon content. However, the specimen melted in air or in oxygen did not have any changes in the hardness and carbon content, because of graphite burning off. This laser surface melting process indicates a possibility of surface hardening by carbon alloying.
社団法人溶接学会の論文
1989-10-01