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国家自然科学基金(50834009)

作品数:29 被引量:87H指数:5
相关作者:王恩刚赫冀成邓安元张静张兴武更多>>
相关机构:东北大学辽宁科技学院中国铝业股份有限公司更多>>
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29 条 记 录,以下是 1-10
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Numerical Analysis of Fluctuation Behavior of Steel/Slag Interface in Continuous Casting Mold with Static Magnetic Field被引量:3
2014年
Utilizing ANSYS CFX commercial software and volume fraction of fluid (VOF) model, fluctuation behav- ior of steel/slag interface was numerically simulated in continuous casting mold with static magnetic field, and the influence of metal jet characteristics on the behavior of steel/slag interface was investigated. The results indicated that the behavior of steel/slag interface is similar at different process parameters, which is closely related to the characteristic of the flow field. The steel/slag interface has an obvious trough characteristic, which can be divided in- to three zones: frontal valley zone, back valley zone and horizontal zone~ as the magnetic flux density increases, the fluctuation of liquid level increases firstly and then decreases, and a reasonable magnetic flux density can make steel/ slag interface obtain a relatively flat interface, which can prevent slag from being entrapped into liquid steel. For a thin slab continuous casting process, when the casting speed is 4 m/min, a reasonable magnetic flux density is about 0.5 T, and the interfacial fluctuation is weaker. No matter the position of magnetic field is horizontal or vertical, for different operating parameters, there is a corresponding reasonable magnetic field position where the steel/slag inter- face fluctuation can be properly controlled and slag entrapment can be prevented.
An-yuan DENGLin XUEn-gang WANGJi-cheng HE
基于可信间隔的特征选择方法研究被引量:3
2011年
传统的特征选择方法没有很好地考虑数据的模式特性而导致性能下降.RelierF是较为有效的特征选择方法,但存在特征权值随样本波动和不能去除冗余特征的问题.对此,从数据本身的模式特性出发,提出了可信间隔的概念和基于可信间隔进行特征选择的方法.以氧化铝回转窑烧结过程数据为实验数据进行特征选择和烧结工况识别实验,结果表明,所提出的方法能去除冗余特征,有效地提高了识别率.
姜慧研柴天佑
关键词:支持向量机模式识别
Al-Si合金宏观偏析、凝固组织演变的元胞自动机-控制容积法耦合模拟被引量:11
2012年
建立凝固过程中宏观流动、传热、溶质传输与微观形核、生长过程双向耦合数学模型,并针对Al-Si二元合金凝固过程进行二维元胞自动机控制容积积分法(CA FV)耦合模拟。模型反映了流场下晶体逆流生长特性,考虑了温降导致的形核和生长以及形核和生长引起的固相分率变化对宏观场的影响,能预测凝固过程中再辉和晶间偏析等现象,反映合金液流动对合金的溶质分布以及凝固组织形貌的作用规律。与仅宏观传输模拟结果和无流动影响的模拟结果进行了对比,验证了耦合模型的优越性。同时考察了铸型尺寸对凝固组织形貌的影响。
张红伟NAKAJIMA Keiji王恩刚赫冀成
关键词:AL-SI合金凝固晶体生长宏观偏析
基于小波神经网络的120t转炉终渣成分预报模型开发被引量:1
2014年
转炉终渣成分对后续炼钢过程将产生重要影响。采用Visual Basic 6.0进行编程,应用克服BP神经网络缺陷的小波神经网络,建立了网络结构为8-10-6,其中隐含层传递函数为Morlet型函数,输出层传递函数为S型函数的120 t转炉终渣成分预报模型。采用550炉数据进行模型训练,经20炉数据现场验证表明,模型预报结果各个成分有85.8%的平均相对误差在0.1以内。模型预测精度较高,可以满足工厂实际使用需要。
张慧书战东平姜周华张洋鹏陈韧
关键词:小波神经网络转炉渣渣成分
Effect of Rotating Electromagnetic Stirring on Solidification Structure of Incoloy 800H
2012年
In this work,the solidification structure of Incoloy 800H with rotating electromagnetic stirring(R-EMS)and without R-EMS were investigated.Comparing the structure without R-EMS,structure with R-EMS is greatly affected by the R-EMS.From the point of view of dendrites,we studied the evolution of solidification structure of Incoloy 800H with R-EMS,consisting of the fine equiaxed dendrites,the long unidirectional dendrites,cross dendrites and equiaxed dendrites.According to the evolution,dendrite fragment dissociation was presented and proved by acquiring the main element composition variation of dendrite trunk in the different zone.As a result,element segregation of the ingot is improved and the grains are refined.
JIANG EnWANG En-gangZHAN Guo-fengDENG An-yuanHE Ji-cheng
关键词:DENDRITE
电磁搅拌对马氏体不锈钢凝固组织的影响被引量:4
2009年
通过马氏体不锈钢的静态浇铸试验研究了电磁搅拌对马氏体不锈钢铸坯凝固组织的影响。使用XRD分析确定马氏体不锈钢中主要相为α-Fe、M、Cr23C6。试验结果表明:电磁搅拌可以大幅提高铸坯的等轴晶率,消除缩孔、缩松,改善铸坯质量,随着搅拌电流的增加,铸坯的等轴晶比率随之增加。施加电磁搅拌后,铸坯晶粒得到细化,铸坯中C、Cr元素的分布变得均匀,屈氏体组织形态和分布发生明显变化:屈氏体组织变小变薄,在基体中的分布也呈弥散化。
战国锋王恩刚姜在伟赫冀成
关键词:马氏体不锈钢电磁搅拌凝固显微组织
电磁搅拌和二冷区冷却强度对Incoloy800H高温合金连铸坯的内部质量影响被引量:5
2016年
研究了不同方式的二冷区电磁搅拌和冷却强度对Incoloy800H高温合金连铸坯凝固组织和内部裂纹的影响。研究结果表明:施加电磁搅拌后的连铸坯内部等轴晶组织比例增加,晶粒细化。单向连续电磁搅拌增加等轴晶比例和细化晶粒的作用效果优于正反交替电磁搅拌。当二冷区冷却水流量由3.0 m^3/h增加至7.1 m^3/h时,等轴晶比例减小,晶粒粗化;电磁搅拌对连铸坯内部裂纹有抑制作用,且单向连续电磁搅拌效果最好。当二冷区冷却强度增加时,铸坯内部熔体的温度梯度增加从而增大热应力,同时由于电磁搅拌的作用时间的减少,使铸坯内部质量恶化,产生严重的内部裂纹。
王菲王韬张兴武邓安元王恩刚
关键词:电磁搅拌连铸
80t LF钢包底吹氩行为的数值模拟被引量:1
2014年
在物理模拟的基础上,利用Fluent软件对某钢厂80tLF钢包底吹氩行为进行数值模拟计算,分析了不同喷嘴布置条件下钢包的流场和混匀效果。结果表明:对不同喷嘴布置条件下的流场进行数值模拟的结果与物理模拟结果相吻合,且可以弥补物理模拟不容易得到精确流场的不足;采用两喷嘴分别在距中心0.5R(R为钢包内径)处,夹角45°的布置方案,钢包混匀时间最短,该方案为最优。
李丰功张慧书战东平邱国兴罗志国姜周华
关键词:LF钢包吹氩数值模拟混匀时间
Analysis of cracking phenomena in continuous casting of 1Cr13 stainless steel billets with final electromagnetic stirring被引量:6
2016年
Solidification cracking that occurs during continuous casting of 1Cr13 stainless steel was investigated with and without final elec- tromagnetic stirring (F-EMS). The results show that cracks initiates and propagates along the grain boundaries where the elements of carbon and sulfur are enriched. The final stirrer should be appropriately placed at a location that is 7.5 m away from the meniscus, and the appropri- ate thickness of the liquid core in the stirring zone is 50 ram. As a stirring current of 250 A is imposed, it can promote colurnnar-equiaxed transition, decrease the secondary dendrite arm spacing, and reduce the segregation of both carbon and sulfur. F-EMS can effectively de- crease the amount of cracks in 1Cr13 stainless steel.
Yu XuRong-jun XuZheng-jie FanCheng-bin LiAn-yuan DengEn-gang Wang
关键词:CRACKING
Oscillation Characteristics of Molten Metal Free Surface Under Compound Magnetic Field被引量:1
2011年
The free surface waves of a molten low-melting point Sn-32%Pb-52%Bi alloy under the imposition of an AC and a static magnetic field were visualized and recorded by use of a laser displacement sensor and a high speed video camera. The Fourier analysis method was used to analyze the oscillation characteristics. The results show that at the center of the free surface,the azimuthal and radial oscillation mode can be found simultaneously owing to AC magnetic field. With increasing coil current intensity,the amplitude and the main frequencies of the oscillations increase,and the azimuthal fluctuation at the center of the free surface is also enhanced. The fluctuation characteristics are closely related to the turbulent flow induced by the alternating electromagnetic force. A series of regular traveling waves can be observed on free surface,and the main frequencies of oscillations at three-phase points decrease owing to superposing AC and static magnetic field. The static magnetic field can remarkably control the unstable swinging behavior of free surface. With increasing static magnetic flux density,the amplitude of oscillations at the center of free surface decreases firstly,and then increases,but the fluctuation amplitude at the triple-phase point always reduces and keeps within 1 mm,and the azimuthal waves at the center of free surface are weakened. Especially at 1.44 T,the radial waves are dominant. The static magnetic flux density should be controlled in an appropriate range to obtain more stable free surface. With compound magnetic field,even if the static magnetic flux density is above 1.0 T,the free surface still vibrates with lower amplitude and dominant frequency.
DENG An-yuan WANG En-gang XU Yong-yi ZHANG Xing-wu HE Ji-cheng
关键词:FLUCTUATION
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