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Analysis of Sheet Curvature in Asymmetrical Cold Rolling

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Journal of Iron and Steel Research International 2013年第5期20卷 34-37页

作者： HAO Liang di hong-shuang GONG dian-yao State Key Laboratory of Rolling Technology and Automation Northeastern University

In asymmetric cold rolling, the workpiece is often bent downwards or upwards. A two-dimensional explicit dynamic finite element model with Arbitrary Lagrangian Eulerian （ALE） adaptive meshing technique has been employed to simulate asymmetrical sheet rolling, in which asymmetrical conditions are here due to different roll radii. To validate the simulation, the results of simulation and experiment are compared. Effects of asymmetry due to roll radii mismatch on the normal and shear distributions and on sheet curvature variations are discussed. An optimum roll radii ratio could be found to produce flat sheet. Trials were conducted to investigate the effectiveness of roll radii mismatch as an approach of sheet curvature control.

关键词： asymmetrical rolling finite element method radii ratio sheet curvature

Application of Fuzzy Logic Controller to Level Control of Twin-Roll Strip Casting

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Journal of Iron and Steel Research International 2003年第4期10卷 28-32页

作者： QI Chun-yu di hong-shuang ZHANG Xiao-ming GAO De-fu Northeastern University

An intelligent fuzzy-PID controller consisting of fuzzy logic controller and PID controller was developed to control the molten steel level of twin-roll strip ***,a feedforward differential PID controller was used for stopper position control in order to avoid differential *** is proved by simulation that the proposed intelligent controller is able to obtain zero steady state error asymptotically and the control system is robust due to its fuggy behavior of the controller.

关键词： twin-roll strip casting modeling molten steel level control intelligent fuzzy-PID control

Weldability of 780 MPa Super-High Strength Heavy-Duty Truck Crossbeam Steel

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Journal of Iron and Steel Research International 2012年第6期19卷 64-69页

作者： WANG Xiao-nan di hong-shuang ZHANG Chit DU Lin-xiu DONG Xue-xir Shagang School of Iron and Steel Soochow University Suzhou 215021 Jiangsu China State KeyLaboratory of Rolling and Automation of Northeastern University Shenyang 110004 Liaoning China）

CO2-shielded welding experiments of newly developed, 780 MPa super-high strength heavy-duty truck crossbeam steel were conducted, and the microstructure, microhardness, mechanical properties, and impact tough- hess of the welded joint were studied. The evolution of the microstructure of the welded joint occurred as follows.. welding seam （acicular ferrite＋proeutectoid ferrite）→fusion zone （granular bainite-long strip M/A island）→coarse grain zone （granular bainite-long strip or short bar M/A island）→fine grain zone （ferrite＋ pearlite＋ blocky M/A is- land）→mixed grained zone （ferrite＋granular bainite＋blocky M/A island）→base metal （proeutectoid ferrite＋gran- ular bainite-hlocky or granular M/A island）. Increasing the density of the grain boundaries can effectively improve the impact toughness, and the blocky M/A island hindered crack propagation more effectively than the long strip M/A island. The new hot-rolled 780 MPa super-high strength steel had excellent weldability. The welding technology was applied under the following conditions： welding voltage was 20 to 21 V, welding current was 200 to 210 A, and the gas flow rate was 25 L/rain.

关键词： super-high strength steel crossbeam steel weldability M/A island impact toughness

Research on Mechanical Model of Material during Twin Roll Strip Casting Process

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Journal of Iron and Steel Research International 2003年第1期10卷 20-23页

作者： MIAO Yu-chuan ZHANG Xiao-ming di hong-shuang WANG Guo-dong LIU Xiang-hua Baoshan Iron and Steel Company Northeastern University

The prototype, basic parameters, composition and structure of computer simulation system of stretch reducing mill for tubes were introduced. The software has an obvious style of object-oriented programming, and the modules were integrated in the simulation system. The system can optimize pass design, and it can automatically classify pass series according to the product syllabus, formulate the rolling table and simulate the rolling parameters in stretch reducing process. The simulation results were compared with the detailed technical data (used as experimental data) provided by Baotou Iron and Steel Company, and the comparison gave a clear proof of the precision of the models.

关键词： tube stretch reducing mill pass design force parameter simulation

Coupled Simulation of Flow and Thermal Field of Twin-Roll Strip Casting Process

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Journal of Iron and Steel Research International 2001年第2期8卷 16-19页

作者： MIAO Yu-chuan ZHANG Xiao-ming WANG Guo-dong di hong-shuang LIU Xiang-hua Northeastern University

The first micro-segregation under conditions of twin roll strip casting was *** relationship between the temperature and solid fraction in the mushy zone was *** temperatures such as ZDT,LIT were got from this *** using the turbulent model,the flow field and thermal field in the pool of twin-roll strip caster was *** speed and temperature at different casting speed was given,and the results were also *** these two simulations,the appropriate casting speed can be *** simulations can provide effective data for controlling the twin-roll strip casting process.

关键词： strip casting micro-segregation solid fraction turbulence

Wear and Thermal Stress Analysis of Side Dam for Twin Roll Strip Casting

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Journal of Iron and Steel Research International 2004年第1期11卷 17-21页

作者： LI Chao-feng di hong-shuang ZHANG Xiao-ming WANG Guo-dong LIU Xiang-hua Northeastern University

The simulation of the work roll temperature field was carried out by means of ANSYS software, and the thermal crown of the roll along its axis was obtained. The thermal-structural coupled element and contact element were introduced. In the simulation of work roll temperature field, the convert boundary condition and the transient thermal contact between the roll and strip were studied. Besides, the dynamic variation of the work roll temperature and the transient temperature distribution of the work roll during hot rolling were investigated. The calculated results were in good agreement with the measured data.

关键词： work roll temperature thermal crown FEM coupled analysis

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镁合金薄带双辊铸轧过程的数值模拟

东北大学学报（自然科学版） 2015年第4期36卷 489-492,497页

作者：黄锋邸洪双东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819

基于立式薄带双辊铸轧工艺的特点,采用有限元法求解镁合金薄带双辊铸轧过程的三维宏观传输方程,并应用ANSYS软件的智能网格划分技术,实现了对铸轧过程中熔池内部温度场、速度场及凝固过程的耦合模拟.分析了铸轧速度及浇注温度等主要工... 详细信息

基于立式薄带双辊铸轧工艺的特点,采用有限元法求解镁合金薄带双辊铸轧过程的三维宏观传输方程,并应用ANSYS软件的智能网格划分技术,实现了对铸轧过程中熔池内部温度场、速度场及凝固过程的耦合模拟.分析了铸轧速度及浇注温度等主要工艺参数对熔池内流场、温度场和凝固终了点的影响规律.研究结果表明,随着浇注温度和铸轧速度的增加,熔池出口处的温度升高,凝固终了点向熔池出口处移动.通过对模拟结果的讨论,给出了适合镁合金薄带铸轧过程的工艺参数：浇注温度为640-660℃,铸轧速度为20-30 m/min.

关键词：双辊铸轧镁合金数值模拟宏观传输有限元法

热处理工艺对30MnSi PC钢棒耐延迟断裂性能的影响

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钢铁 2008年第1期43卷 68-72页

作者：肖桂枝邸洪双东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110004

对30MnSi PC钢棒进行了淬火回火处理,分析探讨了热处理工艺对高强度钢耐延迟断裂性能的影响。采用FIP试验作为PC钢棒耐延迟断裂性能的评价方法。研究发现,相同的回火工艺下30MnSi钢的耐延迟断裂性能随淬火温度的升高呈先升高后降低的趋... 详细信息

对30MnSi PC钢棒进行了淬火回火处理,分析探讨了热处理工艺对高强度钢耐延迟断裂性能的影响。采用FIP试验作为PC钢棒耐延迟断裂性能的评价方法。研究发现,相同的回火工艺下30MnSi钢的耐延迟断裂性能随淬火温度的升高呈先升高后降低的趋势,950℃左右淬火其耐延迟断裂性能较好;在保证强度满足要求的前提下提高回火温度可以提高钢的耐延迟断裂性能。组织观察发现,经430℃左右回火后,30MnSi钢棒得到的回火索(屈)氏体组织均匀细小,碳化物弥散分布在马氏体板条界上,耐延迟断裂性能较好。可见,通过改变热处理制度改变组织形态,是改善30MnSi钢的耐延迟断裂性能的一种有效途径。

关键词： PC钢棒延迟断裂 30MnSi 热处理

780 MPa级微合金钢的激光相变硬化工艺及组织性能

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东北大学学报（自然科学版） 2016年第6期37卷 785-789页

作者：孙茜邸洪双李峻臣东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819

利用4 k W光纤激光器对一种780 MPa级Nb-Ti-Mo微合金化的低碳钢进行了激光相变强化处理,研究了激光功率和扫描速度对激光相变区宏观形貌和显微硬度的影响,讨论了激光相变区显微组织的演变规律.结果表明:随着激光功率的增加或扫描速度的... 详细信息

利用4 k W光纤激光器对一种780 MPa级Nb-Ti-Mo微合金化的低碳钢进行了激光相变强化处理,研究了激光功率和扫描速度对激光相变区宏观形貌和显微硬度的影响,讨论了激光相变区显微组织的演变规律.结果表明:随着激光功率的增加或扫描速度的降低,激光相变区宽度和深度逐渐增加.激光相变区包含三个区域:微熔区、硬化区和过渡区.微熔区显微组织为铁素体、粒状贝氏体和马氏体;硬化区显微组织为全马氏体;过渡区为相对细小的全马氏体或与铁素体的混合组织.在所研究的参数中,硬化区的硬度可超过母材30%左右,平均硬度达到320 HV.实验钢表面耐磨性能提高30%左右.

关键词：激光相变硬化超高强钢显微组织显微硬度耐磨性马氏体