凝固

Based on the recent research results of solidification, computer, electromagnetics, mechanics and Magnetohydrodynamics, the institute formed a subject-constructive way that crossed multi-disciplinary and characterized by EPM(Electromagnetic Processing of Materials) and computer optimization of solidification.

本研究所积极吸取金属凝固、计算机、电磁学、力学和磁流体力学等学科的近代研究成果，走出了一条多学科交叉的、以材料电磁加工和凝固过程计算机优化为特色的学科建设道路。

In order to increase the display speed, the matrix calculation of viewing transformation is eliminated.

根据由数值计算得到的铸件凝固时间，提出了在二维剖面上显示凝固动态过程的方法。

The concordance between the observation phenomena of metalloid alloy and the experimental results of metal alloy is discussed in detail, and the resolving degree of problem unable to be overcome in actual solidification experiment is analyzed.

介绍了用于研究凝固过程的实时观察法的发展情况，同时综述了目前用于实时观察法研究的合金类型和现有的实验仪器和装置，分类探讨了类金属合金实时观测现象与金属合金实验结果的吻合程度，和对实际凝固实验中无法克服的困难的解决情况，并对国内外的发展情况和存在问题进行了分析和讨论。

Over the years, I hesitate to enjoy the winter, turning her body into the cold in the winter, so winter's cold can trigger my feelings, so that the winter cold freezing my humble thoughts, so that the cold solidified my thoughts mature , so that mature thinking sublimation my soul, so that sublimation of the soul collection sunrise moonset, collecting rivers and lakes, so that sunrise and moonset, rivers and lakes, ancient loyal years ......

多少年来，我都义无反顾地喜欢冬天，把自己的身体融入到冬天的寒冷中，让冬天的寒冷能引发我的感慨，让冬天的寒冷凝固我卑微的思想，让凝固的寒冷成熟我的思想，让成熟的思想升华我的灵魂，让升华的灵魂收藏日出月落，收藏江河湖泊，让日出月落、江河湖泊亘古忠诚的岁月

An active mold temperature control method was presented and applied in solidification by developing a measure and control system. The forming process was controlled by the active outer controllable temperature field, which was brought by the individual heating and cooling units distributed in the proportional spacing towards the solidification direction in the mold.

摘 要：提出一种主动式模具温控方法，并开发测控系统将其应用于凝固成形中，通过主动的外加可控温度场来控制零件成形过程，实现零件按自下而上的顺序凝固。

By combination of the finite differential technique with the upper bound elemental technique, simulation for the technology of extrusion directly following liquid infiltration which involves infiltration, solidification, and large plastic deformation in one process has been realized and the essences of various technical processes have been revealed by their corresponding simulation results showing the variation of the infiltrated depth and the temperature field with time during infiltration, the punch position, the solidification development of the matrix alloy, the state of the composite within the deforming zone, and the forming load required at different times during extrusion.

采用有限差分法和上限元法相结合，对融浸渗、凝固和大塑性变形为一体的液态浸渗后直接挤压工艺过程进行了数值模拟，从浸渗时浸渗深度与坯料温度场随时间的变化以及挤压过程不同时刻的冲头压下位置、坯料凝固情况、变形区坯料状态、成形载荷大小等方面揭示了不同工艺条件下的各种挤压过程的实质。

Its rapidsolidification behaviour during recalescence was studied by means of high speed cinematography andrapid infrared pyrometry,It is found that interface heterogeneous nucleation takes place in preferenceto homogeneous nucleation even at an undercooling above the previously accepted critical undercool-ing 0.2T_mfor homogeneous nucleatio...

采用高速摄影及快速红外测温技术研究了深过冷熔体的快速凝固行为。发现尽管过冷度超过了以往认为的均质形核临界过冷度0.2T_m，但是 Ni-32.5%Sn 共晶合金仍然优先发生界面异质形核，再辉过程中瞬时凝固速度最大可达784mm/s。

Gscoh gs fsR, gscoh as the solid fraction when the formation of the continuous dendrite framework, fsR as the maximum solid fraction after recalescence,βs as the solidification shrinkage of the primary phase,μas the dynamic viscosity of the liquid, a as the length of L/S coexistence zone,λ2 as the secondary dendrite arm spacing, and tf as the total solidification time. High temperature recovery and recrystallization taking place in these fragments during further cooling results in the further grain size decrease.

本文通过对过冷DD3高温合金再辉过程中累积应力的计算，得到作用于初生枝晶的累积应力σs，可表示为：式中，gl是液相体积分数，gs是固相体积分数，gscoh是连续枝晶网络形成点对应的固相分数，fsR是再辉结束后固相分数，βs是快速凝固中液固收缩率，μ为液态合金的动力学粘度，a是再辉中液固共存区长度，λ2是枝晶二次间距，tf是总凝固时间，即再辉时间。

The mature of pseudo-recalescence is the remelting of dendrites. This leads to apparent refinement of dendrite microstructures. Therefore the experiment support the viewpoint of dendrite remelting for microstructure refinement during supercooling solidification.②Under the condition of supercooling solidification, secondary recalescence cannot show up for single phase solid solution.

伪再辉现象的本质是枝晶熔断所致，由此引起伪再辉试样微观组织被明显细化，从而支持了深过冷凝固过程中组织细化的枝晶熔断说观点；②单相固熔体合金，在深过冷凝固条件下，不可能出现二次再辉。

Besides, the dendrite and the boride morphology in the big grain and small grains are same. All these results show that the boron addition does not influence the solidification process, but promote the β→α transformation, so still grain refined lamella can be gained at last.

这些实验结果表明：硼化物对Ti46Al8Nb基合金晶粒的细化作用主要不是通过改变 L →β的凝固过程得到的，而是通过影响凝固后的β→α固态相变来实现的。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了