Cu-Pb 합금의 응고조직에 미치는 진동의 영향 = The Influences of Vibration on the Structures of Cu-Pb Alloys

국문 초록 (Abstract)

Cu-Pb 합금에 있어서 結晶粒 微細化, Pb의 重力 偏析, Pb-Leakage 및 硬度등에 미치는 振動의 影響을 조사하기 위하여 凝固中의 Cu-Pb 합금에 60CPS의 振動을 加하였다.
徐冷 凝固組織에서는 Pb의 含量이 10%, 20%, 30%로 증가함에 따라 單位 面積當 結晶粒數의 比가 2.78, 2.54, 1.36배로 되었으며, 急冷 凝固組織에서는 그 比가 24.80, 4.37, 1.90배로 되었다. 卽, 振動은 急冷 凝固인 경우에 結晶粒 微細化 效果가 크게 나타났다.
徐冷 凝固의 경우 振動에 依해서 Pb의 重力 偏析의 程度를 減小, 또는 除去시킬 수 있으며, 硬度를 增加시킬 수 있다.
Cu-20%Pb 합금에서는 振動은 Dendrite가 晶出하기 시작하는 凝固 初期(1010℃∼980℃)에 結晶粒 微細化 效果를 크게 한다.

다국어 초록 (Multilingual Abstract)

To examine the influences of vibration and the duration of vibration on the grain refinement, gravity segregation of lead, leakage of lead and hardness, the 60 cps vibration was given to the melt of Cu-Pb alloy during solidification.
Results obtained from this study can be summarized as follows ;
(1) As the content of lead increases from 10% to 20%, 30%, the ratio of the number of grains per unit area decreases from 2.78 to 2.54, 1.36 in the slowly-cooled structure, and the ratio decreases from 24.80 to 4.37, 1.90 in the rapidly-coolded structure, i.e. the vibration has an effect on the grain refinement in case of low Pb alloy, especially in the rapidly-cooled structure.
(2) In case of slow-cooling, the vibration can suppress or eliminate the amount of gravity segregation of lead, and can increase the hardness.
(3) The influence on the grain refinement occurs only in the period from 1010℃ to 980℃ during which the dendrites begin to form in Cu-20%Pb alloy.