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Mechanical properties prediction of tire cord steel via multi-stage neural network with time-series data 基于时序数据的多级神经网络预测轮胎帘子线钢力学性能
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-12-25 DOI: 10.1080/03019233.2022.2152597
Long Chen, Fei He
ABSTRACT Cord steel is a kind of high-quality wire, whose mechanical properties will affect the safety and service life of tire. Therefore, the prediction model of mechanical properties during production process is very important to ensure the quality stability. In the paper, the Multi-Stage Neural Network with Time-Series data (MSNNTS) is proposed to mine the rich information of high-resolution time-series data and represent multistage process to achieve accurate mechanical properties prediction. According to the results, the best mean relative error, for tensile strength prediction, is about 1.25% and the hit rate with 3% error limit is about 98% on the testing set. It also obtains good results in predicting reduction of area. The results show that the method is of great significance to improve the quality stability and uniformity of cord steel.
帘线钢是一种高质量的钢丝,其力学性能将影响轮胎的安全性和使用寿命。因此,建立生产过程中力学性能的预测模型对保证质量稳定具有重要意义。本文提出了具有时间序列数据的多阶段神经网络(MSNNTS),以挖掘高分辨率时间序列数据中丰富的信息,并表示多阶段过程,从而实现准确的力学性能预测。结果表明,在试验台上,抗拉强度预测的最佳平均相对误差约为1.25%,误差极限为3%的命中率约为98%。在预测面积减少方面也取得了良好的效果。结果表明,该方法对提高帘线钢的质量稳定性和均匀性具有重要意义。
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引用次数: 0
Research on hot deformation behaviour of as-cast W12Cr4V5Co5 steel 铸态W12Cr4V5Co5钢热变形行为研究
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-12-12 DOI: 10.1080/03019233.2022.2151768
Bo Zhao, Min Xia, C. Ge, Ming-Yu Wu
ABSTRACT Hot working response of as-cast W12Cr4V5Co5 steel was investigated by isothermal compression testing in the temperature range of 1000-1150°C and strain rate range of 0.01-10 s−1. Experimental results showed that the flow stress and microstructure evolution were susceptible to the hot deformation parameters. Work hardening first occurred at a small strain, followed by softening, and finally, an approximate dynamic equilibrium was achieved between work hardening and softening. The activation energy of deformation was calculated to be 557.33 kJ mol−1, and constitutive equations compensated with strain were proposed to describe the flow stress as a function of deformation parameters. Microstructure analysis indicated that the average grain size decreased with the increase in strain rate and the decrease in deformation temperature. Additionally, the simulation of hot deformation via Deform-3D software revealed the sample's inhomogeneous deformation during hot compression. This study may provide guidance for hot working of as-cast W12Cr4V5Co5 steel.
通过等温压缩试验,研究了铸态W12Cr4V5Co5钢在1000 ~ 1150℃、应变速率0.01 ~ 10 s−1范围内的热加工响应。实验结果表明,热变形参数对流变应力和微观组织演化有影响。首先在小应变下发生加工硬化,然后发生软化,最后在加工硬化和软化之间达到近似的动态平衡。计算得到变形激活能为557.33 kJ mol−1,并建立了应变补偿本构方程,将流变应力描述为变形参数的函数。显微组织分析表明,随着应变速率的升高和变形温度的降低,平均晶粒尺寸减小。此外,通过Deform-3D软件进行热变形模拟,揭示了试样在热压缩过程中的不均匀变形。本研究可为铸态W12Cr4V5Co5钢的热加工提供指导。
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引用次数: 0
Numerical study on the influence of pellet proportion on burden distribution in blast furnace 球团配比对高炉炉料分布影响的数值研究
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-22 DOI: 10.1080/03019233.2022.2140254
Zhijian Zhao, H. Saxén, Yanjun Liu, X. She, Q. Xue
ABSTRACT A mathematical model of the upper part of a 1080 m3 bell-less top blast furnace is established. The influence of the mass proportion of pellet on burden distribution and packed bed structure is analysed by the discrete element method. The results show that the radial segregation of the charge is affected by the pellet ratio: when the proportion of pellets increases from 20% to 40%, the angle of the pile decreases from 32.3° to 27.3°, while the bottom width of the pile increases, and the height and top width of the pile tend to decrease. Furthermore, with the increase of the proportion of pellets, the porosity of the packed bed tends to decrease. For the packed bed within 1 m from the furnace wall, the porosity tends to decrease from the edge to the centre.
摘要1080上半部分的数学模型 m3无钟炉顶高炉建成。采用离散元法分析了球团质量配比对炉料分布和填料床结构的影响。结果表明,装药的径向偏析受丸粒比的影响:当丸粒比从20%增加到40%时,药堆角度从32.3°减小到27.3°,而药堆底部宽度增加,药堆高度和顶部宽度趋于减小。此外,随着颗粒比例的增加,填充床的孔隙率有降低的趋势。对于1以内的填充床 m处,孔隙率倾向于从边缘到中心减小。
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引用次数: 0
Phase transition mechanism of high-silica fluxed pellets during consolidation 高硅助熔剂球团在固结过程中的相变机制
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-22 DOI: 10.1080/03019233.2022.2144400
Li-ming Ma, Jian-liang Zhang, Yao-zu Wang, M. Lu, Qiu-ye Cai, Chen-yang Xu, Zhuo Li, Zheng-jian Liu
ABSTRACT An in-depth study of the consolidation behaviour of high-silica fluxed pellets will help promote the development of a high-proportion pellet smelting process suitable for China’s resource structure. Lime, slaked lime, and limestone were used as calcium-containing additives to prepare high-silica fluxed pellets, and the suitable calcium-containing additives were lime and limestone. Compared with acid pellets, the suitable preheating temperature of high-silica fluxed pellets is higher (1100°C). The phase transformation during preheating consists mainly of the thermal decomposition of CaCO3 and Ca (OH)2 and the reaction between the solid phases.The roasting temperature of high-silica fluxed pellets should be controlled within a small range (1250°C–1280°C). The phase transition during the roasting of mainly lies in the generation and migration of the liquid phase. The Fe2O3 consolidation, the pore distribution law, and the liquid phase formation jointly determine the consolidation properties of the pellet.
摘要深入研究高硅熔球团矿的固结行为,将有助于开发适合中国资源结构的高比例球团冶炼工艺。以石灰、熟石灰和石灰石为含钙添加剂制备高硅熔剂球团,适宜的含钙添加剂为石灰和石灰石。与酸性球团相比,高硅熔剂球团的适宜预热温度更高(1100°C)。预热过程中的相变主要包括CaCO3和Ca(OH)2的热分解以及固相之间的反应。高硅熔剂球团的焙烧温度应控制在较小范围内(1250°C–1280°C)。焙烧过程中的相变主要表现在液相的生成和迁移。Fe2O3固结、孔隙分布规律和液相形成共同决定了球团的固结特性。
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引用次数: 0
Reverse aging of pearlitic carbon steel wire rod 珠光体碳钢盘条的反向时效
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-13 DOI: 10.1080/03019233.2022.2143087
B. Rivolta, R. Gerosa, D. Panzeri, L. Piazza, L. Angelini, N. Bolognani, Attilio Panzeri, A. Parimbelli, C. Sala
ABSTRACT High carbon steels are employed for the production of critical components, such as ropes, cables and springs. After hot rolling, their microstructure is controlled by Stelmor cooling, since they are often subjected to strong drawing operations. The as-rolled deformability is a basic property to prevent damages in the following plastic deformation. In the industrial world, it is known that their deformability improves significantly after a storage of a certain time, ranging from some days up to 15–20 days. In this experimental work, the deformability of a high carbon steel was investigated after different storage times varying the wire rod diameter. The percentage reduction of area (ROA) increased after some days until a stable value was reached after about 7–15 days depending on the considered diameter. The fracture surfaces of the aged specimens were analysed by SEM.
高碳钢用于生产关键部件,如绳索、电缆和弹簧。在热轧后,它们的组织由Stelmor冷却控制,因为它们经常受到强拉伸操作。轧制变形性能是防止后续塑性变形损伤的基本性能。在工业领域,众所周知,它们的可变形性在储存一定时间后显着提高,从几天到15-20天不等。本实验研究了不同贮存时间、不同线材直径对高碳钢变形性能的影响。几天后,面积减少百分比(ROA)增加,直到约7-15天后达到稳定值,具体取决于所考虑的直径。对时效试样的断口形貌进行了扫描电镜分析。
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引用次数: 0
Optimization of VD/VOD multi-stage serial steam ejectors based on CFD 基于CFD的VD/VOD多级串联蒸汽喷射器优化设计
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-10 DOI: 10.1080/03019233.2022.2139311
R. Amini, S. Kheradmand, Mehrdad Rasoulimoghadam
ABSTRACT The objective of this research is to optimize the first two-stage ejectors of a VD/VOD system in order to increase the entrainment ratio (ER) of the system. By optimizing the first ejector, its working point is located in the double choked region, and its entrainment ratio increases up to 0.342. Furthermore, the maximum back pressure corresponding to the breaking point of the optimized first ejector increases by 12.1% compared to its original state. The working point of the original second ejector is in the single choked region and the performance of this ejector is also low. By optimizing the second ejector, the working point becomes closer to the double choked region, and its entrainment ratio increases by 26.43%. The outlet pressure corresponding to the breaking point of the optimized second ejector increases by 5.1% compared to its original state.
摘要本研究的目的是优化VD/VOD系统的前两级喷射器,以提高系统的夹带率。通过优化第一引射器,使其工作点位于双阻流区,引射率提高到0.342。此外,与优化的第一喷射器的断裂点相对应的最大背压比其原始状态增加了12.1%。原来的第二喷射器的工作点在单阻流区,这种喷射器的性能也很低。通过优化第二喷射器,工作点更接近双阻区,其夹带率提高了26.43%。优化后的第二喷射机的破裂点对应的出口压力比原始状态提高了5.1%。
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引用次数: 0
Fundamentals of reduction of CaO·Fe2O3 in CO/CO2 gas at 1000°C 1000℃CO/CO2气体中CaO·Fe2O3还原的基本原理
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-09 DOI: 10.1080/03019233.2022.2140255
Haiwei An, Xin Jiang, Heng Ji, Zhixin Zhang, Liang He, Hai-yan Zheng, Qiang-jian Gao, F. Shen
ABSTRACT Calcium ferrite is the most basic bonding phase in sinter and the matrix of Silico-ferrites of calcium and aluminium (SFCA). In order to better understand the fundamentals of the reduction of CaO·Fe2O3, CaO·Fe2O3 samples were prepared by solid-state sintering and reduced by CO/CO2 mixture gas at 1000°C. Then, the equilibrium phase and morphology were tested by XRD and SEM-EDS. The experimental results indicated that (1) As CO/(CO + CO2) = 20%, CaO·Fe2O3 was reduced to CaO·FeO·Fe2O3 and 2CaO·Fe2O3. (2) As CO/(CO + CO2) = 40%, CaO·FeO·Fe2O3 was reduced to CaO·3FeO·Fe2O3 and 2CaO·Fe2O3, the equilibrium phases were CaO·3FeO·Fe2O3 and 2CaO·Fe2O3. (3) As CO/(CO + CO2) = 60%, CaO·3FeO·Fe2O3 was reduced to FeO and 2CaO·Fe2O3, and 2CaO·Fe2O3 was still the stable phase. (4) As CO/(CO + CO2) = 80%, FeO was reduced to metallic Fe, and 2CaO·Fe2O3 was reduced to metallic Fe and CaO. The finding from this work may be used as a theoretical foundation for the research of the reduction of SFCA.
摘要钙铁氧体是烧结矿中最基本的结合相,也是钙铝硅铁氧体(SFCA)的基体。为了更好地了解CaO·Fe2O3还原的基本原理,通过固态烧结制备了CaO·Fe 2O3样品,并在1000°C下用CO/CO2混合气体还原。然后,通过XRD和SEM-EDS对平衡相和形貌进行了测试。实验结果表明:(1)As-CO/(CO) + 二氧化碳) = 20%时,CaO·Fe2O3还原为CaO·FeO·FeO3和2CaO·Fe2O3。(2) 作为CO/(CO + 二氧化碳) = 40%时,CaO·FeO·Fe2O3还原为CaO·3FeO·FeO3和2CaO·Fe2O3,平衡相为CaO·3FeO·Fe2O3和2Ca奥·Fe2O3。(3) 作为CO/(CO + 二氧化碳) = 60%时,CaO·3FeO·Fe2O3还原为FeO和2CaO·FeO3,2CaO•Fe2O3仍然是稳定相。(4) 作为CO/(CO + 二氧化碳) = 80%,FeO还原为金属Fe,2CaO·Fe2O3还原为金属铁和CaO。这项工作的发现可以作为研究SFCA还原的理论基础。
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引用次数: 0
Influence mechanism of different reactive Iron Carbon Agglomerates on softening–melting–dropping properties of BF mixed burdens 不同活性铁炭团块对高炉混合炉料软熔降性能的影响机理
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-06 DOI: 10.1080/03019233.2022.2138168
Jiwei Bao, M. Chu, Zhenggen Liu, Dong Han, Jun Guo, Lifeng Zhang
ABSTRACT The application of iron carbon agglomerates (ICA) in blast furnace (BF) is considered to be an innovative technology of low-carbon ironmaking. In this paper, the influence mechanism of different reactive ICAs on softening-melting-dropping properties of BF mixed burdens was revealed. The results show that mixing ICA in the ferrous burdens can effectively improve softening-melting dropping properties of mixed burdens and the improvement effect is the best when the iron ore ratio of ICA is 20%~30%. The influence mechanism is: (1) ICA has a coupling effect with the reduction of ferrous burdens, which can promote reduction of ferrous burdens and improve softening-melting performance of mixed burdens. (2) ICA can promote the molten iron carbonization and reduce the viscosity of primary slag, which can improve dropping performance of slag-iron. (3) ICA can support the skeleton of burden bed and space the burdens, which can improve gas permeability of burden bed.
铁碳团聚体在高炉上的应用被认为是一种低碳炼铁的创新技术。本文揭示了不同反应性ICAs对BF混合料软化熔滴性能的影响机理。结果表明,在含铁炉料中掺入ICA能有效改善混合炉料的软化熔融性能,当ICA的铁矿石配比为20%~30%时,改善效果最好。其影响机理为:(1)ICA与含铁炉料的还原具有耦合作用,可促进含铁炉料还原,提高混合炉料的软化熔融性能。(2) ICA能促进铁水碳化,降低初渣粘度,改善渣铁的滴落性能。(3) ICA可以支撑上料床骨架,使上料间隔开,从而提高上料床的透气性。
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引用次数: 1
Evolution of sulphide inclusion in Mg–Ca treating gear steel 镁钙处理齿轮钢中硫化物夹杂物的演变
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-06 DOI: 10.1080/03019233.2022.2139286
You Xie, Xiaoling Meng, Xiangyang Deng, Shichao Li
ABSTRACT The behaviour of sulphide inclusion in Ti-S-containing gear steel is studied, when Mg–Ca treatment is applied to control the sulphide shape. The results show that MgO + CaS will appear in molten steel after Mg–Ca treatment is carried out and act as the heterogeneous nucleus of TiN and MnS during subsequent solidification process. CaS in molten steel has the tendency to transform into (Ca,Mn)S with the development of solidification. The transformation degree is influenced by cooling rate and even stopped when CaS is totally covered by a TiN shell, resulting in the formation of three types of sulphides with evidently different chemical compositional characteristics in casted billet. Based on the study in the paper, the improvement of sulphide morphology under heterogeneous nucleation effect by oxide core and modification effect by calcium will be prevented by the titanium nitride which precipitates first in Ti-containing gear steel.
摘要研究了采用Mg–Ca处理控制硫化物形状时,含Ti齿轮钢中硫化物夹杂物的行为。结果表明,MgO + Mg–Ca处理后,CaS会出现在钢液中,并在随后的凝固过程中充当TiN和MnS的非均匀核。随着凝固过程的发展,钢水中的CaS有向(Ca,Mn)S转变的趋势。当CaS完全被TiN壳层覆盖时,转变程度受到冷却速度的影响,甚至停止,导致铸坯中形成三种化学成分特征明显不同的硫化物。基于本文的研究,在含钛齿轮钢中首先析出的氮化钛将阻止在氧化物核的非均匀成核作用和钙的改性作用下硫化物形态的改善。
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引用次数: 0
Effect of solidification end impact vibration on the internal quality of a continuous casting billet 凝固端部冲击振动对连铸坯内部质量的影响
IF 2.1 3区 材料科学 Q2 Materials Science Pub Date : 2022-11-06 DOI: 10.1080/03019233.2022.2139048
Baozhen Yang, Hui Zhang, Qiang Lu, Ming-lin Wang, Wenbo Zhao, Chang Shen
ABSTRACT Application of vibration impact at the outer arc side of a billet with a central linear liquid fraction of 25% -35% at 9.5 m from the meniscus. The results show that the impact vibration with low frequency and high impact energy can not only reduce the central porosity degree of the billet from 1.532 to 1.169, but also compact the liquid core, improve the central porosity and promote the heterogeneous nucleation of the molten pool. High frequency and low impact energy can not only increase the proportion of mixed crystal zone by about 8 %, but also reduce the central carbon segregation index from 1.08 to 1.04. Meanwhile, the two kinds of impact vibrations increase the area ratio of the central carbon segregation index in the range of 0.95-1.05 from 56.32% to 70.26% and 80.17%, respectively, and uniform the central carbon distribution of the billet.
振动冲击在距离弯液面9.5米处中心线性液体分数为25%-35%的钢坯外弧侧的应用。结果表明,低频高冲击能量的冲击振动不仅可以将坯料的中心孔隙率从1.532降低到1.169,而且可以压实液芯,提高中心孔隙率,促进熔池的非均匀形核。高频率和低冲击能量不仅可以使混晶区的比例增加约8%,而且可以将中心碳偏析指数从1.08降低到1.04。同时,两种冲击振动使0.95-1.05范围内的中心碳偏析指数的面积比分别从56.32%提高到70.26%和80.17%,使坯料的中心碳分布均匀。
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引用次数: 1
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Ironmaking & Steelmaking
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