Demonstration Experiments on Grain Refinement Caused by Vibration Mold using Ammonium Chloride Solution
Demonstration Experiments on Grain Refinement Caused by Vibration Mold using Ammonium Chloride Solution
复制标题
氯化铵溶液振动模具细化晶粒的示范实验
DOI：
10.11279/jfes.94.62
复制
发表时间：
2022
期刊：
影响因子：
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通讯作者：
恵良 秀則
中科院分区：
文献类型：
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作者：
吉武 靖生;山本 郁;笹栗 信也;恵良 秀則
为了解机械振动细化铸件组织的机理，采用氯化铵溶液进行了模拟试验。为进行水模型实验，制备了氯化铵溶液和不同形状的模具。在开模的情况下，氯化铵晶体在模具壁上结晶，并向模具中心生长，没有振动。然而，当施加振动时，浇注后立即在溶液的上部产生了无数的晶体。在完全堵塞模具的情况下，即使在添加振动的情况下，溶液中也没有出现波动和对流，所看到的行为与没有振动的情况相似。当完全堵塞的结晶器中只发生对流时，发现晶体从结晶器壁移动到溶液中。当在冒口中设置堰时，它有助于防止冒口模壁上产生的晶体迁移到样品中。当Al-2%Cu合金使用带堰的结晶器时，试件中的晶体并没有像水模型实验中看到的那样变得细小。
For the purpose of understanding the mechanism of grain refinement in cast metal by mechanical vibration, demonstration tests were conducted using a Ammonium chloride solution. Ammonium chloride solution and molds with various shape were prepared for the water model experiments. In the case of an open mold, ammonium chloride crystals crystallized on the mold wall and grew toward the center of the mold without vibration. However, when vibration was applied, countless crystals generated at the upper side of the solution immediately after pouring. In the case of a full plugged mold, no wave and convection occurred in the solution even when vibration was added, and the behavior seen was similar to the case without vibration. When only convection occurred in the full plugged mold, crystals were found to move from the mold wall into the solution. When a weir was set in the riser, it helped prevent the generation of crystals on the mold wall of the riser from migrating to the specimen. When a mold with a weir was used for Al-2% Cu alloy, crystals in the specimen did not become refined as seen in the water model experiments.