Waled Elthalabawy Tahir Khan
材料科学技术（英文）
The excellent corrosion resistance, formability and strength make stainless steels versatile for diverse applications. However, its high specific strength and good crashworthiness make it suitable for transportation and aerospace industry. On the other hand, the need to reduce the weight of vehicle and aerospace components has created renewed interest in the use of magnesium alloys. Due to their differences in physical and metallurgical
properties, bonding of the 316L steel and AZ31 magnesium alloy using conventional fusion welding methods encountered many limitations. Therefore, the use of liquid phase forming interlayers is required to overcome the differences in their properties, eliminates the need for a high bonding pressure to achieve intimate contact between the bonded surfaces. Both Cu and Ni interlayers successively formed a eutectic phase with magnesium. The formation of intermetallics and Mg diffusion caused the eutectic phase to isothermally solidify with increasing bonding time. The formation of ternary intermetallic phases (λ1 and B2) impaired the bond shear strength particularly at the end of the isothermal solidification stage where no eutectic phase was observed.
However, the joints showed a higher shear strength value of 57 MPa when bonding with Cu interlayer at 530°C for 30 min compared to 32 MPa when Ni interlayer was used at 510°C for 20 min.
关键词:
Magnesium alloy
,
Stainless steel
,
Eutectic Bonding
,
Microstructure
,
Shear strength
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
,
开式栅格
,
模拟燃料组件
