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2003-2017 冶金工程技术
为您找到包含“”的内容共300

吴明霞,赵旦,杨屹,尹德强

2017-06-12

采用多物理场活化烧结微成形技术(Micro-FAST),在烧结温度850℃和升温速率50℃/s条件下快速(约5min)成功制备了Φ4mm×4mm的NiTi微型圆柱状样品,研究了烧结压力(50, 75, 100 MPa)对多孔NiTi合金致密度和微观组织的影响。结果表明,烧结压力可以通过影响原始粉末生成的孔隙、Kirkendall效应和合金化效应来影响孔隙的形成,大的烧结压力不利于原始粉末生成的孔隙,但有利于Kirkendall效应和合金化效应。考虑到试样的综合性能,从孔隙的形状、大小分布情况看,可确定采用Micro-FAST微成形技术制备NiTi合金的最佳压力为75MPa。

中国博士后科学基金(2014M552356

高等学校博士学科点专项科研基金新教师类资助课题(20130181120118

四川大学制造科学与工程学院,中国人民武装部队警官学院数学与物理学系,四川大学制造科学与工程学院,四川大学制造科学与工程学院

#冶金工程技术#

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王鹏,李晶,史成斌,祁永峰

2017-10-17

借助数值模拟软件MeltFlow-ESR对hadfield steel的电渣重熔过程进行模拟。通过对温度场的数值模拟,探究不同冷却强度对整个重熔过程中凝固组织参数的影响,进而得到冷却强度对hadfield steel电渣锭质量的影响。影响冷却强度的因素有很多,本论文在固定进出水量和冷却水温度的基础上,只考虑结晶器壁与冷却水之间的对流换热系数对冷却强度的影响,该对流换热参数受结晶器壁清洁度的影响,在此基础上进一步探究冷却强度对hadfield steel电渣锭质量的影响。从模拟结果可以得到,冷却强度对hadfield steel的凝固组织有微小的影响,较高的冷却强度会使得一次枝晶间距、二次枝晶间距和局部凝固时间增大,对凝固组织有不良影响。为了提高hadfield steel电渣重熔锭的凝固质量,在实际的生产过程中结晶器壁与冷却水之间的对流换热系数应控制在4000W/(m2-K)左右。

State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,beijing 100083,State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,beijing 100083,State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,beijing 100083,State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,beijing 100083

#冶金工程技术#

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LI Nan,CAO Lingling,LIU Qing,LIN Wenhui,GUO Weida,Ren Keshe

Based on the similarity theory, the influence of the lance height, the gas flowrate and the holes of oxygen lance on the impact effects and mixing behavior in the molten bath were investigated by hydrodynamics experiment using 1:6 water model for 80 t basic oxygen furnace. The results show that the impact diameter, the penetration depth and the cavity shape index all increase with increasing gas flowrate. The optimal mixing time of the bath is 38 s by controlling the oxygen lance height at 138.55 mm. Under the same condition, the mixing effect of the 4-hole nozzle is better than that of the 5-hole nozzle. In addition, the quantitative relation between the dimensionless penetration depth and Fr\' is deducted.

2017-11-17

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China,State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China,State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China,State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China,Shandong Iron and Steel Group Co., Laiwu, 271126, Shandong, China,Shandong Iron and Steel Group Co., Laiwu, 271126, Shandong, China

#Metallurgical Engineering#

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WEN Yanmei,LIU Shaowei,HAN Yanshen,LI Youhuai,LIU Qing,GUAN Min

Taking bloom mold with cross-sectional dimension 240mm×240mm as research object,a three-dimensional mathematical model was established to research effects of the submergence depth of the submerged entry nozzle (SEN) and casting speed on flow field and solidification taking effect of air-gap into account. The simulation result shows that the impact depth in mold with one port SEN is deep which is good for uniform growth of solidified shell. Meanwhile, the air gap has evident effect on corner temperature which is more practical than ignoring air gap. In addition, the distance between backflow vortex core and free surface increases and backflow vortex core moves up obviously, with the increasing of SEN-depth. Solidified shell thickness decreases from 32.43 mm to 17.83 mm with the casting velocity from 0.5 m/min to 0.9 m/min. In conclusion, according to the comparative analysis, the optimal combinations of process parameters are the depth of SEN of 100mm and the casting speed of 0.7 m/min in order to ensure the production efficiency and the bloom quality for the 42CrMo steel with cross-sectional dimension 240 mm×240 mm.

2017-11-17

Innovative & Entrepreneurial Talent Project in Jiangsu province (No.2016A003

Innovative & Entrepreneurial Talent Project in Jiangsu province (No.2016A003

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083,State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083,State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083,Jiangsu Boji Spraying Systems Co., Ltd., Yangzhou, 225267,State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083,Jiangsu Boji Spraying Systems Co., Ltd., Yangzhou, 225267

#Metallurgical Engineering#

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吴仲文,毛文文,鲁华,戴传德,李宏,姜敏

2017-11-22

为研究石灰石加入对转炉熔池混均时间的影响以及有利于转炉硅挥发的喷吹工艺,以某公司60t转炉为原型,建立了以干冰替代石灰石的转炉水模型,考察快速大量逸出CO2对于动力学条件的影响。根据研究结果推论,转炉加入石灰石造渣快速逸出CO2能减少熔池的混匀时间,相对于转炉兑铁水后加入石灰石,兑铁水前加入产生的CO2气体对熔池搅拌的动能更大,最有利于硅挥发反应发生的工业参数为"枪位0.64m +底吹流量164m3/h+顶吹流量11818~12727m3/h。实际生产可以这些参数为基础进行实验确定。

School of metallurgical and ecological engineering, University of Science and Technology Beijing, Beijing 100083, China,School of metallurgical and ecological engineering, University of Science and Technology Beijing, Beijing 100083, China,School of metallurgical and ecological engineering, University of Science and Technology Beijing, Beijing 100083, China,School of metallurgical and ecological engineering, University of Science and Technology Beijing, Beijing 100083, China,School of metallurgical and ecological engineering, University of Science and Technology Beijing, Beijing 100083, China,School of metallurgical and ecological engineering, University of Science and Technology Beijing, Beijing 100083, China

#冶金工程技术#

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张利伟,曹战民

2017-11-28

基于某PS转炉炼铜厂稳定的生产实践数据和BP神经网络,并结合模糊系统,建立了可预测PS转炉渣中铜含量和四氧化三铁的数学模型。此模型弥补了传统BP神经网络易陷入局部极小点、训练不收敛的缺点,再结合模糊推理功能,运用模糊逻辑增强型BP算法,从而增强了BP神经网络收敛速度,提高了模型预报结果的准确性。通过预测结果与实际生产结果的对比,表明误差在一个可允许的范围内。利用模型良好的预测功能,可优化转炉炼铜工艺的炉料配比,达到节省能源以及降低渣中铜含量和四氧化三铁的目的。

北京科技大学冶金与生态工程学院,北京 100083,北京科技大学冶金与生态工程学院,北京 100083

#冶金工程技术#

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李艺,谢伟,曹战民

2017-11-24

本文对Rb2O-V2O5体系相图、热力学数据以及晶体结构数据进行综述与评估,解决了已有相图实验数据之间关于"X"相是否存在的矛盾,获得了可靠的实验数据。采用阴、阳离子贡献方法对中间化合物RbV3O8、RbVO3、Rb32V18O61、Rb4V2O7和Rb3VO4的298 K生成焓(元素参考态)和标准熵进行估算。通过对Rb2O-V2O5体系的液相及中间化合物建立热力学模型,利用相图计算技术进行热力学优化,很好的重现了相图和热力学实验数据,最终获得一套合理、可靠、自洽的模型参数。

School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing

#冶金工程技术#

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彭珂,谢伟,曹战民

2017-11-28

由于特定应用开发新材料的需求日益增长氧化物热力学性质的估算方法,导致对尚未测量的热力学值的需求增加。热力学性质的实验确定是一个耗时和劳动密集的工作,并且一些氧化物很难在常规的条件下合成,那么想得到他们的热力学性质就变得难上加难了。本文主要介绍一些常用的估算氧化物的热力学性质(如:生成焓、熵以及热容)的方法。通过这些估算方法我们可以很快的计算得到这些氧化物的热力学值,为之后的研究打下基础。

School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing

#冶金工程技术#

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毛明坤,姜敏,冀云卿,卢鹏

2017-12-20

IF钢由于其优良的深冲性和无时效性被广泛应用于汽车用钢,目前汽车厂商对汽车用钢表面质量要求非常严格。本文对国内X钢厂生产的IF钢在转炉、RH、中包等工序的钢液和炉渣进行取样,分析了钢液成分、非金属夹杂物分布,并且对炉渣吸收夹杂物的能力进行了一定的研究。经分析发现,RH纯循环过程中T.O含量显著降低,镇静过程中T.O略有增加,浇铸过程中的T.O小于30ppm,RH精炼及浇铸过程中钢水N含量均无明显变化,RH纯循环过程中Als没有明显变化,说明纯循环过程中炉渣对钢液的二次氧化并不明显,更多的是夹杂物的上浮和去除,与T.O检测结果相吻合,RH精炼过程中炉渣中FeO含量、C/A有降低趋势,其他成分无明显变化。

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing100083,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing100083,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing100083,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing100083

#冶金工程技术#

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Guo Xueyi,Liang Sha,Feng Ningchuan,Tian Qinghua

The preparation of orange peel xanthate and its adsorption behaviors of heavy metals: Cu2+, Cd2+, Pb2+, Zn2+, Ni2+ were studied. FTIR spectrum and zeta potentials were used to characterize the prepared orange peel xanthate. Effects of various parameters including equilibrium pH, initial ion concentration and contact time on the adsorption processes for the five metal ions were investigated. For all five metal ions, adsorption isotherms were found to fit Langmuir model and the maximum adsorption capacities of Cu2+, Cd2+, Pb2+, Zn2+ and Ni2+ were obtained as 77.60, 76.57, 218.34, 49.85 and 15.45 mg•g-1, respectively. All adsorption processes can attain equilibrium within 20 min and kinetics was well fitted by psesudo-second order equation. It is proposed that the adsorption mechanism was complexation.

2009-04-02

国家自然科学基金(50774100

School of Metallurgical Science and Technology,School of Metallurgical Science and Technology,School of Metallurgical Science and Technology,School of Metallurgical Science and Technology

#Metallurgical Engineering#

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