While the modulus is satisfied with determinate condition, the root-locus is an equal axle hyperbola.
利用解析法对T(0,4)系统根轨迹进行了研判,导出了在系数满足一定条件时根轨迹为等轴双曲线的结论。
Phase Field Simulation of the Growth of Equiaxed Dendrite for Binary Alloy;
在传统纯物质相场模型的基础上 ,对其中的体系自由能进行重新构造 ,得到一个紧密联系相图且综合考虑了传热、溶质扩散、界面能各向异性和界面动力学各向异性等适用于二元合金枝晶生长的新相场模型 ,并利用该模型结合一种能显著提高计算效率的“临界面点相场大梯度计算域控制法” ,对Al 7Si合金在初始过冷度分别为 3 5K和 5 0K的过冷熔体中等轴枝晶生长进行了模拟 ,得到许多与试验观察相符合的结果 ;同时在枝晶生长过程中跟踪枝晶主轴尖端 ,获得其尖端半径和尖端速率 ,发现随着凝固时间的增加 ,逐渐收敛 ,直到枝晶达到稳定生长 ,而且通过简化KGT模型计算的枝晶尖端的生长速率与模拟值相近。
Using layer-by-layer shave steel scrap, the effect of electromagnetic stirring frequency parameter at secondary cooling area on the central segregation and equiaxed crystal ratio of a 1 450 mm×230 mm slab was investigated by chemical analysis and macrostructure.
通过对板坯逐层刨钢屑,采用化学分析和低倍组织检验的方法,研究了板坯连铸机二冷区电磁搅拌频率参数对1450mm×230mm板坯中心偏析和等轴晶率的影响。
2 billet caster,the modified result shows that central segregation,equiaxed crystal ratio and billet internal quality are markedly improved by adopting appropriate nozzle model,layout and adequate water control.
凌钢通过对2号方坯连铸机二冷制度的优化结果表明,采用合理的喷嘴型号和布置以及适当的水量控制等制度,对减轻铸坯中心偏析、扩大铸坯等轴晶率、提高铸坯内部质量有明显效果,铸坯合格率由优化前的87。
In order to increase proportion of equiaxed grain of billet and homogeneity of solidification structure,a great many liquid metal nucleation stirred by vibration experiments were carried out with zinc.
为提高铸坯的等轴晶率和凝固组织的均匀性,以金属锌为研究对象进行了大量的振动激发金属液形核实验。
In order to increase proportion of equiaxed grain of billet and refine the solidification structure, physical analogue and casting experiments have been carried out with 30% NH_4Cl aqueous solution and ferritic stainless steel respectively.
为了提高铸坯的等轴晶率、细化凝固组织,以30%氯化铵水溶液和铁素体不锈钢为研究对象,分别进行了物理模拟和浇注实验。
The results showed that a fully equiaxed grain structures were formed across the entire welds with additions of 0.
33％时,整个焊缝形成了全部等轴晶组织,并且沿晶界分布的共晶相的数量减少,显著提高了焊缝 金属的抗拉强度和延伸率。
The improvement of slab equiaxed crystal ratio by electric pulse on liquid steel in continuous casting mould of Panzhihua steel No.
从结晶器施加电脉冲的输入能量、电脉冲频率、钢液过热度角度,探讨电脉冲技术提高铸坯等轴晶率的效果。
When solidafication speed is less than 500 μm/min,equiaxed crystals appear in cross and longitudinal sections,there are some twins among crystals,the number is much more,while the solidification speed is smaller.
当凝固速度小于500μm/min时,定向凝固的纯铜试样横、纵截面的晶粒形貌都是等轴晶,晶粒内存在孪晶,凝固速度较小时,其孪晶组织数量较多。
The improvement of slab equiaxed crystal ratio by electric pulse on liquid steel in continuous casting mould at Pan steel slab castor No.
从结晶器施加电脉冲输入能量、钢液过热度、电极间距三方面,探讨电脉冲处理提高铸坯等轴晶率的效果。