排序方式: 共有31条查询结果,搜索用时 31 毫秒
1.
2.
3.
A novel semisolid micro fused-casting(MFC) for preparing A356 alloy strips is proposed, and the effects of process parameters of pouring temperature on the microstructure and properties of A356 alloy strips are investigated. MFC means that the semisolid metal slurry was pressed out from the outlet of bottom of crucible to the movable plate, and directly solidified and formed layer by layer. The microstructure and properties of A356 semisolid alloy slurry were influenced by the cooling conditions. Results show that the aluminu alloy A356 strip samples fabricated by micro fused-casting had good performances and uniform structures with the pouring temperature at 595 ℃ and the substrate movement speed at 18 mm/s. The fine grains of the primary a-Al phase with average grain size of 53 μm and shape factor up to 0.72 was obtained, the ultimate tensile strength of the aluminum alloy A356 strip reaches 243.79±3.91 MPa, while the average vickers hardness is 82.65±1.86 HV. 相似文献
4.
5.
6.
7.
详细分析了环境湿度、导线电晕、电压及温度对带末屏油纸电容式套管及互感器介损的不同影响,强调了做此类预防性试验时易忽视的一些总理2并总结 容式套管及互感器绝缘缺陷的综合分析方法。 相似文献
8.
介绍了数据挖掘技术与数据仓库技术的基本概念 ,提出了决策支持系统所能够解决的电力行业问题 ,并初步给出了基于数据仓库与数据挖掘技术的 ,面向电力设备运行数据的决策支持系统构架 相似文献
9.
10.