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| 1 | Optimization of Short Stroke Control Preset for Automatic Width Control of Hot Rolling Mill显示文摘Automatic width control is a key issue in hot strip rolling process. The edge rolling has been widely used in the roughing stand of hot strip mill to control the width of the slab. However, the edge rolling and consequent horizontal rolling will cause a significant width change in the head part and tail part of the slab, which have to be trimmed before the finishing stands. Based on the width reduction deformation curve of the head and tail along the longitudinal direction of slab, the short stroke control (SSC) technology has been developed to overcome this problem. The finite element method has been used to simulate the unsteady edge rolling process. Three short stroke control curves have been compared in order to obtain the best width control result. The optimized short stroke control curve has been applied to the automatic width control system of industrial hot rolling mill,and good performance is obtained. | DU Xiao-zhong YANG Quan LU Cheng WANG Ai-li Tieu A Kiet | 2010 | Journal of Iron and Steel Research(International)2010，17，6： | 12 |
| 2 | 金属塑性成形的晶体塑性学有限元模拟研究进展显示文摘综述了金属塑性成形过程中晶体塑性有限元模拟的理论背景和应用方面的研究进展,同时总结了国内研究者该领域的研究现状,指出了晶体塑性有限元模拟所要解决的问题及研究重点。晶体塑性理论起源于20世纪20 年代,包括单晶塑性本构理论和多晶塑性本构理论,能够深刻揭示材料变形的规律。与此同时,开始于30多年前的有限元法也已经日益成为求解材料成形理论公式的有效工具。晶体塑性有限元法作为一个强大的模拟工具将二者有机地结合在一起,已经广泛地用于模拟材料的微观结构和各种力学响应,越来越被材料界和力学界的研究者所重视;然而,无论是在理论方面还是应用方面晶体塑性有限元法都还不尽完善。未来晶体塑性有限元模拟的理论研究重点是建立系统的理论架构用于预测由滑移和孪晶引起塑性变形材料的各种力学响应,应用研究重点是运用各种模型模拟其他与织构相关的性能或参数。晶体塑性有限元模拟不仅能够深化人们对材料成形规律的理解, 而且可以不断推进晶体塑性理论的发展。 | 皮华春 韩静涛 薛永栋 TIEU A Kiet 姜正义 | 2006 | 机械工程学报2006，42，3： | 11 |
| 3 | Modeling uniaxial tensile deformation of polycrystalline Al using CPFEM显示文摘The crystal plasticity finite element modeling(CPFEM)is realized in commercial finite element code ABAQUS with UMAT subroutine on the basis of the crystal plasticity theory of rate dependent polycrystal constitutive relations in the mesoscopic scale.The initial orientations obtained by electron backscatter diffraction(EBSD)are directly input into the CPFEM to simulate the mechanical response of polycrystaUine 1050 pure Al in uniaxial tensile deformation.Two polycrystal models and two tensile strain rates were used in the simulations.The stress-strain curves of tensile deformation were analyzed.The predictions and the corre- sponding experiment result show reasonable agreement and slight deviation with experiments.The flow true stress of strain rate 0.01 s^(-1)is higher than that of strain rate 0.001 s^(-1).At the strain less than 0.05,the stress saturated rate of the experiment is higher than the simulated results.However,the stress saturated rate of the experiment becomes gentler than the corresponding simulated predictions at the strain over 0.05.Also,necking was simulated by the two models,but the necking strain is not well predicted.Tensile textures at strain 0.25 were predicted at the low strain rate of 0.001 s^(-1).The predictions are in good accord with the experimental results. | Huachun pi Jingtao Han Chuanguo Zhang A. Kiet Tieu Zhengyi Jiang | 2008 | Journal of University of Science and Technology Beijing2008，15，1： | 4 |
| 4 | Effect of stress state on deformation and fracture of nanocrystalline copper:Molecular dynamics simulation显示文摘Deformation in a microcomponent is often constrained by surrounding joined material making the component under mixed loading and multiple stress states. In this study, molecular dynamics(MD) simulation are conducted to probe the effect of stress states on the deformation and fracture of nanocrystalline Cu. Tensile strain is applied on a Cu single crystal,bicrystal and polycrystal respectively, under two different tension boundary conditions. Simulations are first conducted on the bicrystal and polycrystal models without lattice imperfection. The results reveal that, compared with the performance of simulation models under free boundary condition, the transverse stress caused by the constrained boundary condition leads to a much higher tensile stress and can severely limit the plastic deformation, which in return promotes cleavage fracture in the model. Simulations are then performed on Cu single crystal and polycrystal with an initial crack. Under constrained boundary condition, the crack tip propagates rapidly in the single crystal in a cleavage manner while the crack becomes blunting and extends along the grain boundaries in the polycrystal. Under free boundary condition, massive dislocation activities dominate the deformation mechanisms and the crack plays a little role in both single crystals and polycrystals. | 张亮 吕程 Kiet Tieu 裴林清 赵星 | 2014 | Chinese Physics B2014，23，9： | 1 |
| 5 | Analysis of premature failure of work rolls in a cold strip plant 显示文摘 | Li Hongchun Jiang Zhengyi Kiet A Tieu Sun Weihua | 2007 | Wear2007，263，： | 1 |
| 6 | Significant enhancement of bond strength in the accumulative roll bonding process using nano-sized SiO 2 particles显示文摘 | Cheng Lu Kiet Tieu David Wexler | 2009 | Journal of Materials Processing Tech2009，，10： | 1 |
| 7 | Molecular dynamics simulation on generalized stacking fault energies of FCC metals under preloading stress显示文摘Molecular dynamics(MD) simulations are performed to investigate the effects of stress on generalized stacking fault(GSF) energy of three fcc metals(Cu, Al, and Ni). The simulation model is deformed by uniaxial tension or compression in each of [111], [11-2], and [1-10] directions, respectively, before shifting the lattice to calculate the GSF curve. Simulation results show that the values of unstable stacking fault energy(γusf), stable stacking fault energy(γsf), and unstable twin fault energy(γutf) of the three elements can change with the preloaded tensile or compressive stress in different directions.The ratio of γsf/γusf, which is related to the energy barrier for full dislocation nucleation, and the ratio of γutf/γusf, which is related to the energy barrier for twinning formation are plotted each as a function of the preloading stress. The results of this study reveal that the stress state can change the energy barrier of defect nucleation in the crystal lattice, and thereby can play an important role in the deformation mechanism of nanocrystalline material. | 张亮 吕程 Tieu Kiet 赵星 裴林清 Michal Guillaume | 2015 | Chinese Physics B2015，24，8： | 1 |
| 8 | Modeling of the inlet zone in the mixed lubrication situation of cold strip rolling显示文摘 | Lu Cheng Kiet Tieu A Zheng Y Z | 2003 | Journal of Materials Processing Technology2003，140，： | 1 |
| 9 | 显示文摘 | Wei Dongbin Han Jingtao Kiet Tieu A | 2004 | Scripta Materialia2004，51，： | 1 |
| 10 | Mechanical properties of Al-Mg-Si 'alloy sheets produced using asym- metric cryorolling and ageing treatment 显示文摘 | YU Hai-liang TIEU A Kiet LU Cheng | 2013 | Materials Science & Engineering A2013，，568： | 1 |
| 11 | Mechanics of thin strip steering in hot rolling显示文摘 | Zhengyi Jiang Kiet A Tieu | 2004 | American institute of physics2004，712，： | 1 |
| 12 | A Design of a Third-order CVC Roll Profile显示文摘 | Lu C Kiet Tieu A Jiang Z Y | 2002 | Journal of Materials Processing Technology2002，，： | 1 |
| 13 | Asymmetric Kernel Regression显示文摘 | MACKENZIE M KIET TIEU A | 2004 | IEEE Transactions on Neural Networks2004，15，2： | 1 |
| 14 | Interference patterns of two focused Gaussian beams in an LDA measuring volume显示文摘 | Li Enbang Tieu Kiet Mackenzie Mark | 1997 | Optics and Lasers in Engineering1997，27，： | 1 |
| 15 | Analysis ofpremature failure of work rolls in a cold strip plant显示文摘 | Hongchun Li Zhengyi Jiang Kiet A Tieu | 2007 | Wear2007，263，712： | 1 |
| 16 | Significant enhancement of bond strength in the accumulative roll bonding process using nano-sized SiO 2 particles显示文摘 | Cheng Lu Kiet Tieu David Wexler | 2009 | Journal of Materials Processing Tech2009，，10： | 1 |
| 17 | Potential application of graphene nanoplatelets as a high temperature lubricant for hot rolling显示文摘Graphene has been shown to be a promising solid lubricant to reduce friction and wear of the sliding counterparts,and currently is reported to only function below 600℃.In this study,its potential as a lubricant above 600℃ was studied using a ball-on-disc tribo-meter and a rolling mill.Friction results suggest that a reduction up to 50%can be obtained with graphene nanoplatelets(GnP)under lubricated conditions between 600 and 700℃ when compared with dry tests.and this friction reduction can last more than 3 min.At 800 and 900℃,the friction reduction is stable for 70 and 40 s,respectively,which indicates that GnP can potentially provide an effective lubrication for hot metal forming processes.Hot rolling experiments on steel strips indicate that GnP reduces the rolling force by 11%,7.4%,and 6.9%at 795,890,and 960℃,respectively.These friction reductions are attributed to the easily sheared GnP between the rubbing interfaces.A temperature higher than 600℃ will lead to the gasification of the residual graphene on the strip surface,which is believed to reduce the black contamination from traditional graphite lubricant. | Long WANG Anh Kiet TIEU Ming MA Jiaqing LI Guojuan HAI Hongtao ZHU | 2022 | Friction2022，10，11： | 0 |
| 18 | A(CrFeNi)_(83)(AlTi)_(17) high-entropy alloy matrix solid-lubricating composite with exceptional tribological properties over a wide temperature range显示文摘High-entropy alloy matrix solid-lubricating composites(HSLCs)are promising anti-wear and friction-reduced materials to meet the demands of complicated engineering applications.Here we present a strat-egy to develop HSLCs by using the coupled high-entropy phases of(BCC+FCC+L2_(1))with near-equal volume fraction as the matrix material,instead of using the usual single phase-dominated high-entropy phases,which can preserve the intrinsic strength and deformability of the matrix while activating adap-tive wear protection during sliding.This enables a low coefficient of frictions of 0.23-0.31 and wear rates within the order of 10^(-6)-10^(-5) mm^(3) N m^(-1) for the(CrFeNi)_(83)(AlTi)_(17)-Ag-BaF_(2)/CaF_(2) HSLC between room-temperature and 800℃,considerably outperforming the reported HSLCs and conventional alloy matrix solid-lubricating composites.At low and moderate temperatures,the synergistic Ag-BaF_(2)/CaF_(2) lubricat-ing films eliminate the surface stress concentration upon wear,thus suppressing three-body abrasion and surface roughening during the groove multiplication process.At elevated temperatures,the high-entropy composite tribo-layers provide the friction interface with strong and deformable stress shielding,which avoids the oxidative and adhesive wear triggered by the delamination of the tribo-layer.Developing sim-ilar coupled high-entropy matrix phases may open an avenue for further optimization of the tribological properties of the HSLCs. | Yushan Geng Jun Cheng Hui Tan Qichun Sun Juanjuan Chen Shengyu Zhu Anh Kiet Tieu Jun Yang Weimin Liu | 2023 | Journal of Materials Science & Technology2023，，22： | 0 |
| 19 | A crystal plasticity FE study of macro-and micro-subdivision in aluminium single crystals{001}<110>multi-pass rolled to a high reduction显示文摘In this study,the substructure formation in a multi-pass rolled aluminium single crystal{001}<110>was investigated by the crystal plasticity finite element model,and the predations were validated by experimental observations at both macro-and micro-scale.A finite element model for multi-pass rolling was developed to follow the real experimental rolling scheme,by which the through-thickness macroscopic subdivision was successfully predicted up to a 90%reduction.The macro-subdivision was featured by forming matrix bands through the thickness,and the deformation behaviours,in terms of slip activity,shear strain and crystal rotation,alternated between matrix bands.The development of matrix bands,stability of crystal orientations,and correlation between slip activity,shear strain and crystal rotation have been investigated.Another modelling method,Submodel,was used to exceedingly increase the mesh resolution in smaller regions of interest,and the experimentally observed microstructure,i.e.,micro-subdivision was explicitly and spatially revealed.Similar predictions were obtained in Submodels with different element sizes,which proves the feasibility of this method in predicting microstructure formation.It was found that the substructure formation by varying slip activity and crystal rotation between domains is energy favourable.The procedure of substructure formation was explained based on the predictions,three types of substructure have been identified,and the substructure formation was discussed. | Hui Wang Cheng Lu Kiet Tieu Yu Liu | 2021 | Journal of Materials Science & Technology2021，，17： | 0 |
| 20 | Optimization of pass schedule to improve the strip shape in hot strip rolling显示文摘In this study,the authors proposed a new algorism which can simultaneously meets the strip shape control criterion and the strip crown control criterion.Based on the new algorism,the pass schedule is optimized to maximize the allowable PC angle range.To calculate the objective value for optimization of pass schedule,a slab method has been integrated with the roll stack deformation to simulate the strip profile. | Kiet TIEU Jea Sook CHUNG | 2010 | Baosteel Technical Research2010，4，S1： | 0 |
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