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Effects of longitudinal magnetic field on primary dendrite spacing and segregation of directionally solidified single crystal superalloy

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Progress in Natural Science:Materials International 2024年第1期34卷 26-36页

作者： Congjiang Zhang Yilin Zhou Chen Shen Weili Ren Xiaotan Yuan Biao Ding Haibiao Lu zuosheng lei Yunbo Zhong Ang Zhang State Key Laboratory of Advanced Special Steel College of Materials Science and Engineering Shanghai University National Engineering Research Center for Magnesium Alloys Natural Key Laboratory of Advanced Casting Technologies College of Materials Science and EngineeringChongqing University

The primary dendrite spacing(PDS) and segregation of directionally solidified single crystal(SC) superalloy under the longitudinal magnetic field(LMF) were investigated based on the analysis of the whole cross-sectional microstructure at different solidification distances. The results show that the PDS under the LMF remains basically unchanged at different solidification distances, and it is greater than that under no LMF. With the increase of magnetic field intensity, the PDS increases and the macrosegregation decreases. The increasing PDS and reducing segregation under the LMF can be attributed to the increase of solute boundary layer, which expands the non-equilibrium freezing temperature range and brings the effective partition coefficient closer to 1. The increase of the solute enrichment layer thickness could be caused by the downward secondary circulation generated by the thermoelectric magnetic convection(TEMC) near the interface, which drives the migration of solutes towards the interdendritic region. This work not only clarifies the mechanism of LMF controlling PDS and reducing segregation by TEMC, but also provides theoretical guidance for producing high-quality SC superalloys using magnetic fields.

关键词： Primary dendrite spacing Segregation Single crystal superalloy Directional solidification Magnetic field Thermoelectric magnetic convection

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Effect of Magnetic Field Configuration on Stray-Crystal Formation with Different Platform Sizes during Directional Solidification of Single-Crystal Superalloy

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 904-914页

作者： Keke Lu Congjiang Zhang Xiaotan Yuan Hongbin Yu Weili Ren Biao Ding Haibiao Lu Yunbo Zhong zuosheng lei Hui Wang Qiuliang Wang Peter KLiaw Xuezhi Qin Lanzhang Zhou State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgyShanghai UniversityShanghai 200444China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The magnetic field is an effective means to control the solidification structure and the defects of metal and semiconductor *** work investigates the effects of Cusp magnetic field(CMF)and longitudinal magnetic field(LMF)on the stray-crystal formation in the platform regions during the directional solidification of single-crystal superalloy with the different cross section *** application of CMF reduces the formation of platform stray-crystal,while LMF increases its *** the platform size increases,the stray-crystal ratio increases regardless of whether the magnetic fields are applied or not,the effectiveness of CMF increases,while that of LMF *** reason that the effects of CMF and LMF on the platform stray-crystal formation could be attributed to the change of flow structure from the distribution characteristics of the thermoelectric magnetic force and the magnetic damping force near the liquid-solid interface.

关键词： Stray-crystal Magnetic field Single-crystal superalloy Cross section change Directional solidification

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Effect of electromagnetic stirring on flow field in mold under submerged entry nozzle clogging

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Baosteel Technical Research 2016年第1期10卷 16-20页

作者： GAO Qi ZHOU Yueming lei zuosheng Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China Shanghai Key Laboratory of Modern Metallurgy & Materials Processing Shanghai 200072 China

A physical model with mercury as analog was developed to investigate the influences of electromagnetic stirring（EMS） on flow field in slab continuous casting when the submerged entry nozzle（SEN） was clogged with different clogging rates（0,10% ,25% ,and 50% ）. The flow field in mold under different EMS currents（0, 40 A, and 60 A） was measured by an ultrasonic Doppler velocimeter. The results proved that the flow field in the mold was a typical double roll structure under non-clogging SEN. As the SEN clogging rate increased, the flow field structure was transformed from a double roll to asymmetry flow. When the clogging rate reached 50%, the up circulation disappeared on the clogged side. The zone under the meniscus near the narrow face was a non-flowing area. EMS could correct bias flow caused by SEN clogging and improve the symmetry of the flow field during SEN clogging.

关键词： submerged entry nozzle clogging electromagnetic stirring mold flow field physical model

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Numerical simulation of fluid flows in a slab continuous casting mold under electromagnetic stirring

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Baosteel Technical Research 2016年第1期10卷 10-15页

作者： JIN Xiaoli ZHOU Yueming lei zuosheng Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China Shanghai Key Laboratory of Modern Metallurgy & Materials Processing Shanghai 200072 China

This study established a three-dimensional mathematical model to determine the fluid flow in a slab continuous casting mold under an electromagnetic stirring force. The flow structure and distribution were studied with respect to different continuous casting parameters and stirring current. Based on the calculation results, the mold flux entrapment index in free surface and velocity uniformity index were used to evaluate the flow field in the mold. The theoretical basis for the optimization of the flow field structure was provided. The study also suggested an optimization method for electromagnetic stirring parameters.

关键词： slab continuous casting fluid flow electromagnetic stirring continuous casting parameter optimization

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Mathematical modeling of induction heating of discard substitution block for billet hot extrusion process

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Baosteel Technical Research 2016年第1期10卷 28-32页

作者： ZHU Hongda lei zuosheng GUO Jiahong ZHOU Yueming JIN Xiaoli GAO Qi Shanghai Institute of Applied M athematics and M echanics Shanghai University State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferromentallurgy &School of M aterials Science and Engineering Shanghai University Research Institute Baoshan Iron & Steel Co.Ltd.

A magnetic and temperature field-coupled mathematical model is proposed to calculate the induction heating process of a discard substitution block for billet hot extrusion process. The mathematical model is validated by comparing simulation results with temperature measurements recorded during physical modeling. Based on systematical analysis of calculation results, a quantitative sawtooth induction power curve was proposed to realize the aim of achieving the best distributed temperature field in the block within the shortest induction time.

关键词： induction heating discard substitution hot extrusion mathematical modeling

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Physical modeling and numerical simulation of electromagnetic stirring in a slab continuous casting mold

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Baosteel Technical Research 2016年第1期10卷 3-9页

作者： LI Bin lei zuosheng GE Jiangmeng ZHONG Yunbo REN Zhongming ZHOU Yueming WU Cunyou JIN Xiaoli WEI Rujun State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai 200072 China Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China

Through physical modeling and numerical simulation,the flow field in a slab continuous casting mold with electromagnetic stirring is measured under different casting parameters and stirring currents. To qualitatively evaluate the flow field in the mold, two indexes,i, e., mold flux entrapment and velocity uniformity, are proposed. Based on these two indexes, some optimized stirring parameters under different casting conditions can be determined.

关键词： slab continuous casting mold electromagnetic stirring optimized parameters

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Experiment Study on the Liquid Metal Flow in Narrow-Side-Patter Magnetic Field

Experiment Study on the Liquid Metal Flow in Narrow-Side-Pat...

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Asia Steel International Conference 2012(Asia Steel 2012)

作者： Zhenqiang ZHANG Zhongming REN Kang DENG zuosheng lei (School of Materials Shanghai University Shanghai 200072)

＜正＞A physical model with mercury was developed to investigate the control of the narrow-side-patter magnetic field on the flow in medium and slab continuous casting *** velocity in mold with and without magnetic field was measured by Ultrasonic Doppler *** influence of the magnetic field on the horizontal velocity of free level,fluctuation of free level and penetrating depth are *** results showed that the speed and rate of raising flow in the upper recirculation zone is reduced,the active degree about free level is dropped,the stability of horizontal flow in free level is strengthened;The fluctuation of free level is reduced to be in favour of reducing entrapment of steel liquid;the penetrating depth is reduced to promote more uniformity of metal liquid in whole flowing field and plug-like flow is formed more easily.

关键词： continuous casting mold electromagnetic braking physical simulation Narrow-Side-Patter Magnetic Field

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强磁场下共沉淀-相转化法制备纳米钴铁氧体颗粒

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金属学报 2007年第5期43卷 529-533页

作者：桂林钟云波傅小明雷作胜任忠鸣上海大学上海市现代冶金与材料制备重点实验室上海200072

在强磁场下采用共沉淀-相转化法制备出了纳米级的钴铁氧体颗粒;通过SEM,XRD和VSM等分析手段,考察了磁感应强度对纳米钴铁氧体形貌及性能的影响规律．结果表明:无磁场及磁感应强度小于2 T时,纳米钴铁氧体颗粒为球形;当磁感应强度大于、等... 详细信息

在强磁场下采用共沉淀-相转化法制备出了纳米级的钴铁氧体颗粒;通过SEM,XRD和VSM等分析手段,考察了磁感应强度对纳米钴铁氧体形貌及性能的影响规律．结果表明:无磁场及磁感应强度小于2 T时,纳米钴铁氧体颗粒为球形;当磁感应强度大于、等于4 T时,棒状纳米钴铁氧体开始形成．随着磁感应强度的增大,棒状纳米颗粒数量增加,纳米钴铁氧体的晶化程度提高,磁性能(Mr,Ms,Mr／Ms)也大幅度提高。与无磁场相比, 10 T时制备的纳米钴铁氧体颗粒的剩余磁化强度Mr增加近15倍,饱和磁化强度Ms提高约1．44倍．从磁聚合定向生长和临界磁畴角度分析了强磁场影响共沉淀-相转化法制备的纳米钴铁氧体的形貌、晶化程度及磁性变化的机理．

关键词：钴铁氧体纳米强磁场共沉淀

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高频调幅交变电磁场金属液滴悬浮振荡的3维数值模拟

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上海大学学报（自然科学版） 2021年第5期27卷 879-890页

作者：连景杰郭加宏雷作胜上海大学上海市应用数学和力学研究所上海200072 上海大学省部共建特殊钢冶金与制备国家重点实验室上海200444

采用有限元方法模拟高频调幅交变电磁场以及液滴内流体流动,金属液滴自由界面的追踪采用任意拉格朗日欧拉(arbitrary Lagrange-Euler,ALE)方法.数值模拟得到了高频调幅交变电磁场、金属液滴内部液体流动和液滴表面形变的动态行为.数值... 详细信息

采用有限元方法模拟高频调幅交变电磁场以及液滴内流体流动,金属液滴自由界面的追踪采用任意拉格朗日欧拉(arbitrary Lagrange-Euler,ALE)方法.数值模拟得到了高频调幅交变电磁场、金属液滴内部液体流动和液滴表面形变的动态行为.数值结果表明:在高频调幅交变电磁场中,金属液滴所受洛伦兹力集中在液滴内部近表面区域,液滴受近似表面力的洛伦兹力激励;在表面张力和重力的共同作用下呈周期性振荡,液滴的振荡幅度起伏变化,具备参数振荡特征.对液滴振荡的频谱分析结果显示,液滴振荡的主频和高频调幅交变电磁场的调制波频率相同,在其倍频处也会出现较大峰值,液滴振荡的频谱特征与高频调幅交变电磁场中金属液滴所受洛伦兹力的频率特性吻合.

关键词：高频调幅交变电磁场金属液滴悬浮振荡数值模拟

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薄带双辊连铸水口电磁制动的实验模拟

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金属学报 2006年第7期42卷 751-756页

作者：李启胜邓康雷作胜李伟轩任忠鸣上海大学上海市钢铁冶金新技术开发应用重点实验室上海200072

为控制薄带双辊连铸结晶器内金属液面的波动,提出了水口电磁制动(N-EMBr)设想．通过在水口区域施加稳恒磁场与直流电流,减缓水口金属液对双辊熔池的冲击文中对熔池液面的波动情况进行了实验模拟;观测了有无电磁制动及不同水口浸入深度... 详细信息

为控制薄带双辊连铸结晶器内金属液面的波动,提出了水口电磁制动(N-EMBr)设想．通过在水口区域施加稳恒磁场与直流电流,减缓水口金属液对双辊熔池的冲击文中对熔池液面的波动情况进行了实验模拟;观测了有无电磁制动及不同水口浸入深度等条件下熔池液面的波动情况,并测量了水口金属液冲击力的相对变化．结果显示,随输入电流增大,水口出量减小,双辊结晶器内液面波动幅度和频率降低,熔池液面趋于平稳．这表明水口电磁制动可望有效抑制熔池液面波动,为解决薄带双辊连铸结晶器内金属液的布流和流动控制问题,提供一种可选择的方法．

关键词：双辊连铸水口电磁制动液位波动实验模拟

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