炭化水素ガスによるレーザ加炭焼入れ技術の開発

概要

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New laser carburizing quench process using hydrocarbon gas as the assist gas was proposed to strengthen ultra low carbon steel sheet. In this paper, the effect of CH_4 concentration and various laser radiation parameters on hardness and area of fusion zone was investigated. Tensile strength of laser treated specimen were measured. The results of the present work were summarized as follows, (1) By using CH_4,fusion zone with vickers hardness of more than 400 was obtained.(2) Hardness and area of fusion zone were well controlled by CH_4 concentration, laser power, focal position, beam scanning rate and so on.(3) Tensile strength of laser treated specimen was about 20% higher than that of base metal.(4) CO_2 laser carburizing apparatus consisting of the nozzle head and the exhaust of CH_4 was newly developed, which enabled to strengthen ultra low carbon steel without breaking focal lens and the combustion of CH_4.
社団法人溶接学会の論文
1996-11-05