M.M.Haque
,
A.A.Khan
材料科学技术（英文）
In this work, alpha (α) brass was poured in green sand mould and metallic chill mould at about 1050℃. Sand casting method and metallic chill casting method are representing the slow and fast cooling rates of the castings, respectively. The slow cooling rate in the sand mould produces larger grains, while the metallic chill mould produces smaller grains in the castings. As the grain size decreases, the strength of the cast brass increases; micro-porosity in the casting decreases and the tendency for the casting to fracture during solidification decreases. Thus, the faster cooling rate casting offers higher strength, density and hardness compared to the slow cooling rate casting.
关键词:
Green sand
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null
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null
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汪利民
,
宗桂芳
工程热物理学报
堆芯模拟是压水堆水力模拟实验研究的关键技术，通常采用燃料组件一一对应的模拟方式，使堆芯流量分配实验数据有一一对应关系。
本文结合秦山核电二期工程介绍了电站压水堆堆芯水力模拟的一般理论和方法。在国内首次应用E.U.Khan压水堆开式栅格堆芯模拟理论，用22棒束模拟原型1717棒束，用特殊研制的内磁式涡轮流量计测量堆芯入口流量分配，微型电导电极测量下空腔流动交混，完成了600 MWe反应堆水力模拟堆芯的设计、实验等工作。
关键词:
电站压水堆
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开式栅格
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模拟燃料组件
