研究論文
ブレーズ法によるダクタイル鋳鉄と鋼の接合組織及び接合強さに及ぼす接合条件の影響
1993 年 65 巻 2 号 p. 99-105
詳細
1993 年 65 巻 2 号 p. 99-105
Ductile cast iron and mild steel were brazed with pure copper fillers using a high frequency induction heating with Ar atmosphere and a furnace heating with vacuum atmosphere. During brazing, rod-like crystals of Fe-Cu-C alloy precipitated at the cast iron side, and they grew toward the steel corresponding to the simultaneous dissolution of the steel. Length of rod-like crystal (LA) and width of bonded zone (WB) increased with an increase in both the bonding temperature and the holding time. After the crystals reached the steel, pearlite layer began to form in the steel because of diffusion of carbon in the cast iron through the crystal to the steel. Bond-strength (τB) increased with an increase in both the bonding temperature and the holding time. Under the same bonding condition, τB enlarged as the thinner filler metal was used. It was found that τB increased in proportion to the ratio (GA) of LA to WB and that the larger the WB, the lower the τB at GA = 100 %.
