쾌삭황동 (快削黃銅) 의 절삭성 및 기계적 성질에 미치는 주조냉각속도의 영향 = Effect of Cooling Rate on Machinability and Mechanical Properties of Free Cutting Brass

국문 초록 (Abstract)

鑄造冷却速度가 快削黃銅의 切削性 및 機械的性質에 미치는 영향을 砂型 金型 및 冷却水 통한 金型을 使用하여 硏究하였다.
冷却速度가 빠를때는 납粒子는 素地金屬內에 微細하게 分布되었으며 β相은 針狀형태를 나타내었다, 冷却速度가 늦을 경우는 납은 둥글고 크게 분포되고 粒界에 몰리는 경향을 나타냈으며 β相은 板狀형태를 보였다.
切削性 및機械的性質은 鑄造冷却速度가 빨라서 납粒子 및 β相이 微細하고 針狀일 경우에 우수하였다.

다국어 초록 (Multilingual Abstract)

The effects of cooling rate on the machinability and other mechanical properties of free cutting brass were examined through sand mold, metal mold and water-cooled metal mold casting respectively. When the cooling rate was rapid, the lead particles were finely dispersed throughout the matrix and the β-phases appeared to be needlelike, when the cooling rate was slow, the lead particles formed themselves into large spheroids mainly along the grain boundaries while the β-phases shaped into plates. The machinability and mechanical properties turned out satisfactory in the case of rapid cooling rate.